metrics: pull library and introduce ResettingTimer and InfluxDB reporter (#15910)

* go-metrics: fork library and introduce ResettingTimer and InfluxDB reporter.

* vendor: change nonsense/go-metrics to ethersphere/go-metrics

* go-metrics: add tests. move ResettingTimer logic from reporter to type.

* all, metrics: pull in metrics package in go-ethereum

* metrics/test: make sure metrics are enabled for tests

* metrics: apply gosimple rules

* metrics/exp, internal/debug: init expvar endpoint when starting pprof server

* internal/debug: tiny comment formatting fix

28 files changed, 0 insertions, 3716 deletions

diff --git a/vendor/github.com/rcrowley/go-metrics/LICENSE b/vendor/github.com/rcrowley/go-metrics/LICENSE
deleted file mode 100644
index 363fa9ee7..000000000
--- a/vendor/github.com/rcrowley/go-metrics/LICENSE
+++ /dev/null
@@ -1,29 +0,0 @@
-Copyright 2012 Richard Crowley. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    1.  Redistributions of source code must retain the above copyright
-        notice, this list of conditions and the following disclaimer.
-
-    2.  Redistributions in binary form must reproduce the above
-        copyright notice, this list of conditions and the following
-        disclaimer in the documentation and/or other materials provided
-        with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY RICHARD CROWLEY ``AS IS'' AND ANY EXPRESS
-OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL RICHARD CROWLEY OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
-THE POSSIBILITY OF SUCH DAMAGE.
-
-The views and conclusions contained in the software and documentation
-are those of the authors and should not be interpreted as representing
-official policies, either expressed or implied, of Richard Crowley.
diff --git a/vendor/github.com/rcrowley/go-metrics/README.md b/vendor/github.com/rcrowley/go-metrics/README.md
deleted file mode 100644
index 2d1a6dcfa..000000000
--- a/vendor/github.com/rcrowley/go-metrics/README.md
+++ /dev/null
@@ -1,153 +0,0 @@
-go-metrics
-==========
-
-![travis build status](https://travis-ci.org/rcrowley/go-metrics.svg?branch=master)
-
-Go port of Coda Hale's Metrics library: <https://github.com/dropwizard/metrics>.
-
-Documentation: <http://godoc.org/github.com/rcrowley/go-metrics>.
-
-Usage
------
-
-Create and update metrics:
-
-```go
-c := metrics.NewCounter()
-metrics.Register("foo", c)
-c.Inc(47)
-
-g := metrics.NewGauge()
-metrics.Register("bar", g)
-g.Update(47)
-
-r := NewRegistry()
-g := metrics.NewRegisteredFunctionalGauge("cache-evictions", r, func() int64 { return cache.getEvictionsCount() })
-
-s := metrics.NewExpDecaySample(1028, 0.015) // or metrics.NewUniformSample(1028)
-h := metrics.NewHistogram(s)
-metrics.Register("baz", h)
-h.Update(47)
-
-m := metrics.NewMeter()
-metrics.Register("quux", m)
-m.Mark(47)
-
-t := metrics.NewTimer()
-metrics.Register("bang", t)
-t.Time(func() {})
-t.Update(47)
-```
-
-Register() is not threadsafe. For threadsafe metric registration use
-GetOrRegister:
-
-```
-t := metrics.GetOrRegisterTimer("account.create.latency", nil)
-t.Time(func() {})
-t.Update(47)
-```
-
-Periodically log every metric in human-readable form to standard error:
-
-```go
-go metrics.Log(metrics.DefaultRegistry, 5 * time.Second, log.New(os.Stderr, "metrics: ", log.Lmicroseconds))
-```
-
-Periodically log every metric in slightly-more-parseable form to syslog:
-
-```go
-w, _ := syslog.Dial("unixgram", "/dev/log", syslog.LOG_INFO, "metrics")
-go metrics.Syslog(metrics.DefaultRegistry, 60e9, w)
-```
-
-Periodically emit every metric to Graphite using the [Graphite client](https://github.com/cyberdelia/go-metrics-graphite):
-
-```go
-
-import "github.com/cyberdelia/go-metrics-graphite"
-
-addr, _ := net.ResolveTCPAddr("tcp", "127.0.0.1:2003")
-go graphite.Graphite(metrics.DefaultRegistry, 10e9, "metrics", addr)
-```
-
-Periodically emit every metric into InfluxDB:
-
-**NOTE:** this has been pulled out of the library due to constant fluctuations
-in the InfluxDB API. In fact, all client libraries are on their way out. see
-issues [#121](https://github.com/rcrowley/go-metrics/issues/121) and
-[#124](https://github.com/rcrowley/go-metrics/issues/124) for progress and details.
-
-```go
-import "github.com/vrischmann/go-metrics-influxdb"
-
-go influxdb.Influxdb(metrics.DefaultRegistry, 10e9, &influxdb.Config{
-    Host:     "127.0.0.1:8086",
-    Database: "metrics",
-    Username: "test",
-    Password: "test",
-})
-```
-
-Periodically upload every metric to Librato using the [Librato client](https://github.com/mihasya/go-metrics-librato):
-
-**Note**: the client included with this repository under the `librato` package
-has been deprecated and moved to the repository linked above.
-
-```go
-import "github.com/mihasya/go-metrics-librato"
-
-go librato.Librato(metrics.DefaultRegistry,
-    10e9,                  // interval
-    "example@example.com", // account owner email address
-    "token",               // Librato API token
-    "hostname",            // source
-    []float64{0.95},       // percentiles to send
-    time.Millisecond,      // time unit
-)
-```
-
-Periodically emit every metric to StatHat:
-
-```go
-import "github.com/rcrowley/go-metrics/stathat"
-
-go stathat.Stathat(metrics.DefaultRegistry, 10e9, "example@example.com")
-```
-
-Maintain all metrics along with expvars at `/debug/metrics`:
-
-This uses the same mechanism as [the official expvar](http://golang.org/pkg/expvar/)
-but exposed under `/debug/metrics`, which shows a json representation of all your usual expvars
-as well as all your go-metrics.
-
-
-```go
-import "github.com/rcrowley/go-metrics/exp"
-
-exp.Exp(metrics.DefaultRegistry)
-```
-
-Installation
-------------
-
-```sh
-go get github.com/rcrowley/go-metrics
-```
-
-StatHat support additionally requires their Go client:
-
-```sh
-go get github.com/stathat/go
-```
-
-Publishing Metrics
-------------------
-
-Clients are available for the following destinations:
-
-* Librato - [https://github.com/mihasya/go-metrics-librato](https://github.com/mihasya/go-metrics-librato)
-* Graphite - [https://github.com/cyberdelia/go-metrics-graphite](https://github.com/cyberdelia/go-metrics-graphite)
-* InfluxDB - [https://github.com/vrischmann/go-metrics-influxdb](https://github.com/vrischmann/go-metrics-influxdb)
-* Ganglia - [https://github.com/appscode/metlia](https://github.com/appscode/metlia)
-* Prometheus - [https://github.com/deathowl/go-metrics-prometheus](https://github.com/deathowl/go-metrics-prometheus)
diff --git a/vendor/github.com/rcrowley/go-metrics/counter.go b/vendor/github.com/rcrowley/go-metrics/counter.go
deleted file mode 100644
index bb7b039cb..000000000
--- a/vendor/github.com/rcrowley/go-metrics/counter.go
+++ /dev/null
@@ -1,112 +0,0 @@
-package metrics
-
-import "sync/atomic"
-
-// Counters hold an int64 value that can be incremented and decremented.
-type Counter interface {
-	Clear()
-	Count() int64
-	Dec(int64)
-	Inc(int64)
-	Snapshot() Counter
-}
-
-// GetOrRegisterCounter returns an existing Counter or constructs and registers
-// a new StandardCounter.
-func GetOrRegisterCounter(name string, r Registry) Counter {
-	if nil == r {
-		r = DefaultRegistry
-	}
-	return r.GetOrRegister(name, NewCounter).(Counter)
-}
-
-// NewCounter constructs a new StandardCounter.
-func NewCounter() Counter {
-	if UseNilMetrics {
-		return NilCounter{}
-	}
-	return &StandardCounter{0}
-}
-
-// NewRegisteredCounter constructs and registers a new StandardCounter.
-func NewRegisteredCounter(name string, r Registry) Counter {
-	c := NewCounter()
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// CounterSnapshot is a read-only copy of another Counter.
-type CounterSnapshot int64
-
-// Clear panics.
-func (CounterSnapshot) Clear() {
-	panic("Clear called on a CounterSnapshot")
-}
-
-// Count returns the count at the time the snapshot was taken.
-func (c CounterSnapshot) Count() int64 { return int64(c) }
-
-// Dec panics.
-func (CounterSnapshot) Dec(int64) {
-	panic("Dec called on a CounterSnapshot")
-}
-
-// Inc panics.
-func (CounterSnapshot) Inc(int64) {
-	panic("Inc called on a CounterSnapshot")
-}
-
-// Snapshot returns the snapshot.
-func (c CounterSnapshot) Snapshot() Counter { return c }
-
-// NilCounter is a no-op Counter.
-type NilCounter struct{}
-
-// Clear is a no-op.
-func (NilCounter) Clear() {}
-
-// Count is a no-op.
-func (NilCounter) Count() int64 { return 0 }
-
-// Dec is a no-op.
-func (NilCounter) Dec(i int64) {}
-
-// Inc is a no-op.
-func (NilCounter) Inc(i int64) {}
-
-// Snapshot is a no-op.
-func (NilCounter) Snapshot() Counter { return NilCounter{} }
-
-// StandardCounter is the standard implementation of a Counter and uses the
-// sync/atomic package to manage a single int64 value.
-type StandardCounter struct {
-	count int64
-}
-
-// Clear sets the counter to zero.
-func (c *StandardCounter) Clear() {
-	atomic.StoreInt64(&c.count, 0)
-}
-
-// Count returns the current count.
-func (c *StandardCounter) Count() int64 {
-	return atomic.LoadInt64(&c.count)
-}
-
-// Dec decrements the counter by the given amount.
-func (c *StandardCounter) Dec(i int64) {
-	atomic.AddInt64(&c.count, -i)
-}
-
-// Inc increments the counter by the given amount.
-func (c *StandardCounter) Inc(i int64) {
-	atomic.AddInt64(&c.count, i)
-}
-
-// Snapshot returns a read-only copy of the counter.
-func (c *StandardCounter) Snapshot() Counter {
-	return CounterSnapshot(c.Count())
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/debug.go b/vendor/github.com/rcrowley/go-metrics/debug.go
deleted file mode 100644
index 043ccefab..000000000
--- a/vendor/github.com/rcrowley/go-metrics/debug.go
+++ /dev/null
@@ -1,76 +0,0 @@
-package metrics
-
-import (
-	"runtime/debug"
-	"time"
-)
-
-var (
-	debugMetrics struct {
-		GCStats struct {
-			LastGC Gauge
-			NumGC  Gauge
-			Pause  Histogram
-			//PauseQuantiles Histogram
-			PauseTotal Gauge
-		}
-		ReadGCStats Timer
-	}
-	gcStats debug.GCStats
-)
-
-// Capture new values for the Go garbage collector statistics exported in
-// debug.GCStats.  This is designed to be called as a goroutine.
-func CaptureDebugGCStats(r Registry, d time.Duration) {
-	for _ = range time.Tick(d) {
-		CaptureDebugGCStatsOnce(r)
-	}
-}
-
-// Capture new values for the Go garbage collector statistics exported in
-// debug.GCStats.  This is designed to be called in a background goroutine.
-// Giving a registry which has not been given to RegisterDebugGCStats will
-// panic.
-//
-// Be careful (but much less so) with this because debug.ReadGCStats calls
-// the C function runtime·lock(runtime·mheap) which, while not a stop-the-world
-// operation, isn't something you want to be doing all the time.
-func CaptureDebugGCStatsOnce(r Registry) {
-	lastGC := gcStats.LastGC
-	t := time.Now()
-	debug.ReadGCStats(&gcStats)
-	debugMetrics.ReadGCStats.UpdateSince(t)
-
-	debugMetrics.GCStats.LastGC.Update(int64(gcStats.LastGC.UnixNano()))
-	debugMetrics.GCStats.NumGC.Update(int64(gcStats.NumGC))
-	if lastGC != gcStats.LastGC && 0 < len(gcStats.Pause) {
-		debugMetrics.GCStats.Pause.Update(int64(gcStats.Pause[0]))
-	}
-	//debugMetrics.GCStats.PauseQuantiles.Update(gcStats.PauseQuantiles)
-	debugMetrics.GCStats.PauseTotal.Update(int64(gcStats.PauseTotal))
-}
-
-// Register metrics for the Go garbage collector statistics exported in
-// debug.GCStats.  The metrics are named by their fully-qualified Go symbols,
-// i.e. debug.GCStats.PauseTotal.
-func RegisterDebugGCStats(r Registry) {
-	debugMetrics.GCStats.LastGC = NewGauge()
-	debugMetrics.GCStats.NumGC = NewGauge()
-	debugMetrics.GCStats.Pause = NewHistogram(NewExpDecaySample(1028, 0.015))
-	//debugMetrics.GCStats.PauseQuantiles = NewHistogram(NewExpDecaySample(1028, 0.015))
-	debugMetrics.GCStats.PauseTotal = NewGauge()
-	debugMetrics.ReadGCStats = NewTimer()
-
-	r.Register("debug.GCStats.LastGC", debugMetrics.GCStats.LastGC)
-	r.Register("debug.GCStats.NumGC", debugMetrics.GCStats.NumGC)
-	r.Register("debug.GCStats.Pause", debugMetrics.GCStats.Pause)
-	//r.Register("debug.GCStats.PauseQuantiles", debugMetrics.GCStats.PauseQuantiles)
-	r.Register("debug.GCStats.PauseTotal", debugMetrics.GCStats.PauseTotal)
-	r.Register("debug.ReadGCStats", debugMetrics.ReadGCStats)
-}
-
-// Allocate an initial slice for gcStats.Pause to avoid allocations during
-// normal operation.
-func init() {
-	gcStats.Pause = make([]time.Duration, 11)
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/ewma.go b/vendor/github.com/rcrowley/go-metrics/ewma.go
deleted file mode 100644
index 694a1d033..000000000
--- a/vendor/github.com/rcrowley/go-metrics/ewma.go
+++ /dev/null
@@ -1,118 +0,0 @@
-package metrics
-
-import (
-	"math"
-	"sync"
-	"sync/atomic"
-)
-
-// EWMAs continuously calculate an exponentially-weighted moving average
-// based on an outside source of clock ticks.
-type EWMA interface {
-	Rate() float64
-	Snapshot() EWMA
-	Tick()
-	Update(int64)
-}
-
-// NewEWMA constructs a new EWMA with the given alpha.
-func NewEWMA(alpha float64) EWMA {
-	if UseNilMetrics {
-		return NilEWMA{}
-	}
-	return &StandardEWMA{alpha: alpha}
-}
-
-// NewEWMA1 constructs a new EWMA for a one-minute moving average.
-func NewEWMA1() EWMA {
-	return NewEWMA(1 - math.Exp(-5.0/60.0/1))
-}
-
-// NewEWMA5 constructs a new EWMA for a five-minute moving average.
-func NewEWMA5() EWMA {
-	return NewEWMA(1 - math.Exp(-5.0/60.0/5))
-}
-
-// NewEWMA15 constructs a new EWMA for a fifteen-minute moving average.
-func NewEWMA15() EWMA {
-	return NewEWMA(1 - math.Exp(-5.0/60.0/15))
-}
-
-// EWMASnapshot is a read-only copy of another EWMA.
-type EWMASnapshot float64
-
-// Rate returns the rate of events per second at the time the snapshot was
-// taken.
-func (a EWMASnapshot) Rate() float64 { return float64(a) }
-
-// Snapshot returns the snapshot.
-func (a EWMASnapshot) Snapshot() EWMA { return a }
-
-// Tick panics.
-func (EWMASnapshot) Tick() {
-	panic("Tick called on an EWMASnapshot")
-}
-
-// Update panics.
-func (EWMASnapshot) Update(int64) {
-	panic("Update called on an EWMASnapshot")
-}
-
-// NilEWMA is a no-op EWMA.
-type NilEWMA struct{}
-
-// Rate is a no-op.
-func (NilEWMA) Rate() float64 { return 0.0 }
-
-// Snapshot is a no-op.
-func (NilEWMA) Snapshot() EWMA { return NilEWMA{} }
-
-// Tick is a no-op.
-func (NilEWMA) Tick() {}
-
-// Update is a no-op.
-func (NilEWMA) Update(n int64) {}
-
-// StandardEWMA is the standard implementation of an EWMA and tracks the number
-// of uncounted events and processes them on each tick.  It uses the
-// sync/atomic package to manage uncounted events.
-type StandardEWMA struct {
-	uncounted int64 // /!\ this should be the first member to ensure 64-bit alignment
-	alpha     float64
-	rate      float64
-	init      bool
-	mutex     sync.Mutex
-}
-
-// Rate returns the moving average rate of events per second.
-func (a *StandardEWMA) Rate() float64 {
-	a.mutex.Lock()
-	defer a.mutex.Unlock()
-	return a.rate * float64(1e9)
-}
-
-// Snapshot returns a read-only copy of the EWMA.
-func (a *StandardEWMA) Snapshot() EWMA {
-	return EWMASnapshot(a.Rate())
-}
-
-// Tick ticks the clock to update the moving average.  It assumes it is called
-// every five seconds.
-func (a *StandardEWMA) Tick() {
-	count := atomic.LoadInt64(&a.uncounted)
-	atomic.AddInt64(&a.uncounted, -count)
-	instantRate := float64(count) / float64(5e9)
-	a.mutex.Lock()
-	defer a.mutex.Unlock()
-	if a.init {
-		a.rate += a.alpha * (instantRate - a.rate)
-	} else {
-		a.init = true
-		a.rate = instantRate
-	}
-}
-
-// Update adds n uncounted events.
-func (a *StandardEWMA) Update(n int64) {
-	atomic.AddInt64(&a.uncounted, n)
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/exp/exp.go b/vendor/github.com/rcrowley/go-metrics/exp/exp.go
deleted file mode 100644
index 11dd3f898..000000000
--- a/vendor/github.com/rcrowley/go-metrics/exp/exp.go
+++ /dev/null
@@ -1,156 +0,0 @@
-// Hook go-metrics into expvar
-// on any /debug/metrics request, load all vars from the registry into expvar, and execute regular expvar handler
-package exp
-
-import (
-	"expvar"
-	"fmt"
-	"net/http"
-	"sync"
-
-	"github.com/rcrowley/go-metrics"
-)
-
-type exp struct {
-	expvarLock sync.Mutex // expvar panics if you try to register the same var twice, so we must probe it safely
-	registry   metrics.Registry
-}
-
-func (exp *exp) expHandler(w http.ResponseWriter, r *http.Request) {
-	// load our variables into expvar
-	exp.syncToExpvar()
-
-	// now just run the official expvar handler code (which is not publicly callable, so pasted inline)
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
-	fmt.Fprintf(w, "{\n")
-	first := true
-	expvar.Do(func(kv expvar.KeyValue) {
-		if !first {
-			fmt.Fprintf(w, ",\n")
-		}
-		first = false
-		fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
-	})
-	fmt.Fprintf(w, "\n}\n")
-}
-
-// Exp will register an expvar powered metrics handler with http.DefaultServeMux on "/debug/vars"
-func Exp(r metrics.Registry) {
-	h := ExpHandler(r)
-	// this would cause a panic:
-	// panic: http: multiple registrations for /debug/vars
-	// http.HandleFunc("/debug/vars", e.expHandler)
-	// haven't found an elegant way, so just use a different endpoint
-	http.Handle("/debug/metrics", h)
-}
-
-// ExpHandler will return an expvar powered metrics handler.
-func ExpHandler(r metrics.Registry) http.Handler {
-	e := exp{sync.Mutex{}, r}
-	return http.HandlerFunc(e.expHandler)
-}
-
-func (exp *exp) getInt(name string) *expvar.Int {
-	var v *expvar.Int
-	exp.expvarLock.Lock()
-	p := expvar.Get(name)
-	if p != nil {
-		v = p.(*expvar.Int)
-	} else {
-		v = new(expvar.Int)
-		expvar.Publish(name, v)
-	}
-	exp.expvarLock.Unlock()
-	return v
-}
-
-func (exp *exp) getFloat(name string) *expvar.Float {
-	var v *expvar.Float
-	exp.expvarLock.Lock()
-	p := expvar.Get(name)
-	if p != nil {
-		v = p.(*expvar.Float)
-	} else {
-		v = new(expvar.Float)
-		expvar.Publish(name, v)
-	}
-	exp.expvarLock.Unlock()
-	return v
-}
-
-func (exp *exp) publishCounter(name string, metric metrics.Counter) {
-	v := exp.getInt(name)
-	v.Set(metric.Count())
-}
-
-func (exp *exp) publishGauge(name string, metric metrics.Gauge) {
-	v := exp.getInt(name)
-	v.Set(metric.Value())
-}
-func (exp *exp) publishGaugeFloat64(name string, metric metrics.GaugeFloat64) {
-	exp.getFloat(name).Set(metric.Value())
-}
-
-func (exp *exp) publishHistogram(name string, metric metrics.Histogram) {
-	h := metric.Snapshot()
-	ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-	exp.getInt(name + ".count").Set(h.Count())
-	exp.getFloat(name + ".min").Set(float64(h.Min()))
-	exp.getFloat(name + ".max").Set(float64(h.Max()))
-	exp.getFloat(name + ".mean").Set(float64(h.Mean()))
-	exp.getFloat(name + ".std-dev").Set(float64(h.StdDev()))
-	exp.getFloat(name + ".50-percentile").Set(float64(ps[0]))
-	exp.getFloat(name + ".75-percentile").Set(float64(ps[1]))
-	exp.getFloat(name + ".95-percentile").Set(float64(ps[2]))
-	exp.getFloat(name + ".99-percentile").Set(float64(ps[3]))
-	exp.getFloat(name + ".999-percentile").Set(float64(ps[4]))
-}
-
-func (exp *exp) publishMeter(name string, metric metrics.Meter) {
-	m := metric.Snapshot()
-	exp.getInt(name + ".count").Set(m.Count())
-	exp.getFloat(name + ".one-minute").Set(float64(m.Rate1()))
-	exp.getFloat(name + ".five-minute").Set(float64(m.Rate5()))
-	exp.getFloat(name + ".fifteen-minute").Set(float64((m.Rate15())))
-	exp.getFloat(name + ".mean").Set(float64(m.RateMean()))
-}
-
-func (exp *exp) publishTimer(name string, metric metrics.Timer) {
-	t := metric.Snapshot()
-	ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-	exp.getInt(name + ".count").Set(t.Count())
-	exp.getFloat(name + ".min").Set(float64(t.Min()))
-	exp.getFloat(name + ".max").Set(float64(t.Max()))
-	exp.getFloat(name + ".mean").Set(float64(t.Mean()))
-	exp.getFloat(name + ".std-dev").Set(float64(t.StdDev()))
-	exp.getFloat(name + ".50-percentile").Set(float64(ps[0]))
-	exp.getFloat(name + ".75-percentile").Set(float64(ps[1]))
-	exp.getFloat(name + ".95-percentile").Set(float64(ps[2]))
-	exp.getFloat(name + ".99-percentile").Set(float64(ps[3]))
-	exp.getFloat(name + ".999-percentile").Set(float64(ps[4]))
-	exp.getFloat(name + ".one-minute").Set(float64(t.Rate1()))
-	exp.getFloat(name + ".five-minute").Set(float64(t.Rate5()))
-	exp.getFloat(name + ".fifteen-minute").Set(float64((t.Rate15())))
-	exp.getFloat(name + ".mean-rate").Set(float64(t.RateMean()))
-}
-
-func (exp *exp) syncToExpvar() {
-	exp.registry.Each(func(name string, i interface{}) {
-		switch i.(type) {
-		case metrics.Counter:
-			exp.publishCounter(name, i.(metrics.Counter))
-		case metrics.Gauge:
-			exp.publishGauge(name, i.(metrics.Gauge))
-		case metrics.GaugeFloat64:
-			exp.publishGaugeFloat64(name, i.(metrics.GaugeFloat64))
-		case metrics.Histogram:
-			exp.publishHistogram(name, i.(metrics.Histogram))
-		case metrics.Meter:
-			exp.publishMeter(name, i.(metrics.Meter))
-		case metrics.Timer:
-			exp.publishTimer(name, i.(metrics.Timer))
-		default:
-			panic(fmt.Sprintf("unsupported type for '%s': %T", name, i))
-		}
-	})
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/gauge.go b/vendor/github.com/rcrowley/go-metrics/gauge.go
deleted file mode 100644
index cb57a9388..000000000
--- a/vendor/github.com/rcrowley/go-metrics/gauge.go
+++ /dev/null
@@ -1,120 +0,0 @@
-package metrics
-
-import "sync/atomic"
-
-// Gauges hold an int64 value that can be set arbitrarily.
-type Gauge interface {
-	Snapshot() Gauge
-	Update(int64)
-	Value() int64
-}
-
-// GetOrRegisterGauge returns an existing Gauge or constructs and registers a
-// new StandardGauge.
-func GetOrRegisterGauge(name string, r Registry) Gauge {
-	if nil == r {
-		r = DefaultRegistry
-	}
-	return r.GetOrRegister(name, NewGauge).(Gauge)
-}
-
-// NewGauge constructs a new StandardGauge.
-func NewGauge() Gauge {
-	if UseNilMetrics {
-		return NilGauge{}
-	}
-	return &StandardGauge{0}
-}
-
-// NewRegisteredGauge constructs and registers a new StandardGauge.
-func NewRegisteredGauge(name string, r Registry) Gauge {
-	c := NewGauge()
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// NewFunctionalGauge constructs a new FunctionalGauge.
-func NewFunctionalGauge(f func() int64) Gauge {
-	if UseNilMetrics {
-		return NilGauge{}
-	}
-	return &FunctionalGauge{value: f}
-}
-
-// NewRegisteredFunctionalGauge constructs and registers a new StandardGauge.
-func NewRegisteredFunctionalGauge(name string, r Registry, f func() int64) Gauge {
-	c := NewFunctionalGauge(f)
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// GaugeSnapshot is a read-only copy of another Gauge.
-type GaugeSnapshot int64
-
-// Snapshot returns the snapshot.
-func (g GaugeSnapshot) Snapshot() Gauge { return g }
-
-// Update panics.
-func (GaugeSnapshot) Update(int64) {
-	panic("Update called on a GaugeSnapshot")
-}
-
-// Value returns the value at the time the snapshot was taken.
-func (g GaugeSnapshot) Value() int64 { return int64(g) }
-
-// NilGauge is a no-op Gauge.
-type NilGauge struct{}
-
-// Snapshot is a no-op.
-func (NilGauge) Snapshot() Gauge { return NilGauge{} }
-
-// Update is a no-op.
-func (NilGauge) Update(v int64) {}
-
-// Value is a no-op.
-func (NilGauge) Value() int64 { return 0 }
-
-// StandardGauge is the standard implementation of a Gauge and uses the
-// sync/atomic package to manage a single int64 value.
-type StandardGauge struct {
-	value int64
-}
-
-// Snapshot returns a read-only copy of the gauge.
-func (g *StandardGauge) Snapshot() Gauge {
-	return GaugeSnapshot(g.Value())
-}
-
-// Update updates the gauge's value.
-func (g *StandardGauge) Update(v int64) {
-	atomic.StoreInt64(&g.value, v)
-}
-
-// Value returns the gauge's current value.
-func (g *StandardGauge) Value() int64 {
-	return atomic.LoadInt64(&g.value)
-}
-
-// FunctionalGauge returns value from given function
-type FunctionalGauge struct {
-	value func() int64
-}
-
-// Value returns the gauge's current value.
-func (g FunctionalGauge) Value() int64 {
-	return g.value()
-}
-
-// Snapshot returns the snapshot.
-func (g FunctionalGauge) Snapshot() Gauge { return GaugeSnapshot(g.Value()) }
-
-// Update panics.
-func (FunctionalGauge) Update(int64) {
-	panic("Update called on a FunctionalGauge")
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/gauge_float64.go b/vendor/github.com/rcrowley/go-metrics/gauge_float64.go
deleted file mode 100644
index 6f93920b2..000000000
--- a/vendor/github.com/rcrowley/go-metrics/gauge_float64.go
+++ /dev/null
@@ -1,127 +0,0 @@
-package metrics
-
-import "sync"
-
-// GaugeFloat64s hold a float64 value that can be set arbitrarily.
-type GaugeFloat64 interface {
-	Snapshot() GaugeFloat64
-	Update(float64)
-	Value() float64
-}
-
-// GetOrRegisterGaugeFloat64 returns an existing GaugeFloat64 or constructs and registers a
-// new StandardGaugeFloat64.
-func GetOrRegisterGaugeFloat64(name string, r Registry) GaugeFloat64 {
-	if nil == r {
-		r = DefaultRegistry
-	}
-	return r.GetOrRegister(name, NewGaugeFloat64()).(GaugeFloat64)
-}
-
-// NewGaugeFloat64 constructs a new StandardGaugeFloat64.
-func NewGaugeFloat64() GaugeFloat64 {
-	if UseNilMetrics {
-		return NilGaugeFloat64{}
-	}
-	return &StandardGaugeFloat64{
-		value: 0.0,
-	}
-}
-
-// NewRegisteredGaugeFloat64 constructs and registers a new StandardGaugeFloat64.
-func NewRegisteredGaugeFloat64(name string, r Registry) GaugeFloat64 {
-	c := NewGaugeFloat64()
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// NewFunctionalGauge constructs a new FunctionalGauge.
-func NewFunctionalGaugeFloat64(f func() float64) GaugeFloat64 {
-	if UseNilMetrics {
-		return NilGaugeFloat64{}
-	}
-	return &FunctionalGaugeFloat64{value: f}
-}
-
-// NewRegisteredFunctionalGauge constructs and registers a new StandardGauge.
-func NewRegisteredFunctionalGaugeFloat64(name string, r Registry, f func() float64) GaugeFloat64 {
-	c := NewFunctionalGaugeFloat64(f)
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// GaugeFloat64Snapshot is a read-only copy of another GaugeFloat64.
-type GaugeFloat64Snapshot float64
-
-// Snapshot returns the snapshot.
-func (g GaugeFloat64Snapshot) Snapshot() GaugeFloat64 { return g }
-
-// Update panics.
-func (GaugeFloat64Snapshot) Update(float64) {
-	panic("Update called on a GaugeFloat64Snapshot")
-}
-
-// Value returns the value at the time the snapshot was taken.
-func (g GaugeFloat64Snapshot) Value() float64 { return float64(g) }
-
-// NilGauge is a no-op Gauge.
-type NilGaugeFloat64 struct{}
-
-// Snapshot is a no-op.
-func (NilGaugeFloat64) Snapshot() GaugeFloat64 { return NilGaugeFloat64{} }
-
-// Update is a no-op.
-func (NilGaugeFloat64) Update(v float64) {}
-
-// Value is a no-op.
-func (NilGaugeFloat64) Value() float64 { return 0.0 }
-
-// StandardGaugeFloat64 is the standard implementation of a GaugeFloat64 and uses
-// sync.Mutex to manage a single float64 value.
-type StandardGaugeFloat64 struct {
-	mutex sync.Mutex
-	value float64
-}
-
-// Snapshot returns a read-only copy of the gauge.
-func (g *StandardGaugeFloat64) Snapshot() GaugeFloat64 {
-	return GaugeFloat64Snapshot(g.Value())
-}
-
-// Update updates the gauge's value.
-func (g *StandardGaugeFloat64) Update(v float64) {
-	g.mutex.Lock()
-	defer g.mutex.Unlock()
-	g.value = v
-}
-
-// Value returns the gauge's current value.
-func (g *StandardGaugeFloat64) Value() float64 {
-	g.mutex.Lock()
-	defer g.mutex.Unlock()
-	return g.value
-}
-
-// FunctionalGaugeFloat64 returns value from given function
-type FunctionalGaugeFloat64 struct {
-	value func() float64
-}
-
-// Value returns the gauge's current value.
-func (g FunctionalGaugeFloat64) Value() float64 {
-	return g.value()
-}
-
-// Snapshot returns the snapshot.
-func (g FunctionalGaugeFloat64) Snapshot() GaugeFloat64 { return GaugeFloat64Snapshot(g.Value()) }
-
-// Update panics.
-func (FunctionalGaugeFloat64) Update(float64) {
-	panic("Update called on a FunctionalGaugeFloat64")
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/graphite.go b/vendor/github.com/rcrowley/go-metrics/graphite.go
deleted file mode 100644
index abd0a7d29..000000000
--- a/vendor/github.com/rcrowley/go-metrics/graphite.go
+++ /dev/null
@@ -1,113 +0,0 @@
-package metrics
-
-import (
-	"bufio"
-	"fmt"
-	"log"
-	"net"
-	"strconv"
-	"strings"
-	"time"
-)
-
-// GraphiteConfig provides a container with configuration parameters for
-// the Graphite exporter
-type GraphiteConfig struct {
-	Addr          *net.TCPAddr  // Network address to connect to
-	Registry      Registry      // Registry to be exported
-	FlushInterval time.Duration // Flush interval
-	DurationUnit  time.Duration // Time conversion unit for durations
-	Prefix        string        // Prefix to be prepended to metric names
-	Percentiles   []float64     // Percentiles to export from timers and histograms
-}
-
-// Graphite is a blocking exporter function which reports metrics in r
-// to a graphite server located at addr, flushing them every d duration
-// and prepending metric names with prefix.
-func Graphite(r Registry, d time.Duration, prefix string, addr *net.TCPAddr) {
-	GraphiteWithConfig(GraphiteConfig{
-		Addr:          addr,
-		Registry:      r,
-		FlushInterval: d,
-		DurationUnit:  time.Nanosecond,
-		Prefix:        prefix,
-		Percentiles:   []float64{0.5, 0.75, 0.95, 0.99, 0.999},
-	})
-}
-
-// GraphiteWithConfig is a blocking exporter function just like Graphite,
-// but it takes a GraphiteConfig instead.
-func GraphiteWithConfig(c GraphiteConfig) {
-	log.Printf("WARNING: This go-metrics client has been DEPRECATED! It has been moved to https://github.com/cyberdelia/go-metrics-graphite and will be removed from rcrowley/go-metrics on August 12th 2015")
-	for _ = range time.Tick(c.FlushInterval) {
-		if err := graphite(&c); nil != err {
-			log.Println(err)
-		}
-	}
-}
-
-// GraphiteOnce performs a single submission to Graphite, returning a
-// non-nil error on failed connections. This can be used in a loop
-// similar to GraphiteWithConfig for custom error handling.
-func GraphiteOnce(c GraphiteConfig) error {
-	log.Printf("WARNING: This go-metrics client has been DEPRECATED! It has been moved to https://github.com/cyberdelia/go-metrics-graphite and will be removed from rcrowley/go-metrics on August 12th 2015")
-	return graphite(&c)
-}
-
-func graphite(c *GraphiteConfig) error {
-	now := time.Now().Unix()
-	du := float64(c.DurationUnit)
-	conn, err := net.DialTCP("tcp", nil, c.Addr)
-	if nil != err {
-		return err
-	}
-	defer conn.Close()
-	w := bufio.NewWriter(conn)
-	c.Registry.Each(func(name string, i interface{}) {
-		switch metric := i.(type) {
-		case Counter:
-			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, metric.Count(), now)
-		case Gauge:
-			fmt.Fprintf(w, "%s.%s.value %d %d\n", c.Prefix, name, metric.Value(), now)
-		case GaugeFloat64:
-			fmt.Fprintf(w, "%s.%s.value %f %d\n", c.Prefix, name, metric.Value(), now)
-		case Histogram:
-			h := metric.Snapshot()
-			ps := h.Percentiles(c.Percentiles)
-			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, h.Count(), now)
-			fmt.Fprintf(w, "%s.%s.min %d %d\n", c.Prefix, name, h.Min(), now)
-			fmt.Fprintf(w, "%s.%s.max %d %d\n", c.Prefix, name, h.Max(), now)
-			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, h.Mean(), now)
-			fmt.Fprintf(w, "%s.%s.std-dev %.2f %d\n", c.Prefix, name, h.StdDev(), now)
-			for psIdx, psKey := range c.Percentiles {
-				key := strings.Replace(strconv.FormatFloat(psKey*100.0, 'f', -1, 64), ".", "", 1)
-				fmt.Fprintf(w, "%s.%s.%s-percentile %.2f %d\n", c.Prefix, name, key, ps[psIdx], now)
-			}
-		case Meter:
-			m := metric.Snapshot()
-			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, m.Count(), now)
-			fmt.Fprintf(w, "%s.%s.one-minute %.2f %d\n", c.Prefix, name, m.Rate1(), now)
-			fmt.Fprintf(w, "%s.%s.five-minute %.2f %d\n", c.Prefix, name, m.Rate5(), now)
-			fmt.Fprintf(w, "%s.%s.fifteen-minute %.2f %d\n", c.Prefix, name, m.Rate15(), now)
-			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, m.RateMean(), now)
-		case Timer:
-			t := metric.Snapshot()
-			ps := t.Percentiles(c.Percentiles)
-			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, t.Count(), now)
-			fmt.Fprintf(w, "%s.%s.min %d %d\n", c.Prefix, name, t.Min()/int64(du), now)
-			fmt.Fprintf(w, "%s.%s.max %d %d\n", c.Prefix, name, t.Max()/int64(du), now)
-			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, t.Mean()/du, now)
-			fmt.Fprintf(w, "%s.%s.std-dev %.2f %d\n", c.Prefix, name, t.StdDev()/du, now)
-			for psIdx, psKey := range c.Percentiles {
-				key := strings.Replace(strconv.FormatFloat(psKey*100.0, 'f', -1, 64), ".", "", 1)
-				fmt.Fprintf(w, "%s.%s.%s-percentile %.2f %d\n", c.Prefix, name, key, ps[psIdx], now)
-			}
-			fmt.Fprintf(w, "%s.%s.one-minute %.2f %d\n", c.Prefix, name, t.Rate1(), now)
-			fmt.Fprintf(w, "%s.%s.five-minute %.2f %d\n", c.Prefix, name, t.Rate5(), now)
-			fmt.Fprintf(w, "%s.%s.fifteen-minute %.2f %d\n", c.Prefix, name, t.Rate15(), now)
-			fmt.Fprintf(w, "%s.%s.mean-rate %.2f %d\n", c.Prefix, name, t.RateMean(), now)
-		}
-		w.Flush()
-	})
-	return nil
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/healthcheck.go b/vendor/github.com/rcrowley/go-metrics/healthcheck.go
deleted file mode 100644
index 445131cae..000000000
--- a/vendor/github.com/rcrowley/go-metrics/healthcheck.go
+++ /dev/null
@@ -1,61 +0,0 @@
-package metrics
-
-// Healthchecks hold an error value describing an arbitrary up/down status.
-type Healthcheck interface {
-	Check()
-	Error() error
-	Healthy()
-	Unhealthy(error)
-}
-
-// NewHealthcheck constructs a new Healthcheck which will use the given
-// function to update its status.
-func NewHealthcheck(f func(Healthcheck)) Healthcheck {
-	if UseNilMetrics {
-		return NilHealthcheck{}
-	}
-	return &StandardHealthcheck{nil, f}
-}
-
-// NilHealthcheck is a no-op.
-type NilHealthcheck struct{}
-
-// Check is a no-op.
-func (NilHealthcheck) Check() {}
-
-// Error is a no-op.
-func (NilHealthcheck) Error() error { return nil }
-
-// Healthy is a no-op.
-func (NilHealthcheck) Healthy() {}
-
-// Unhealthy is a no-op.
-func (NilHealthcheck) Unhealthy(error) {}
-
-// StandardHealthcheck is the standard implementation of a Healthcheck and
-// stores the status and a function to call to update the status.
-type StandardHealthcheck struct {
-	err error
-	f   func(Healthcheck)
-}
-
-// Check runs the healthcheck function to update the healthcheck's status.
-func (h *StandardHealthcheck) Check() {
-	h.f(h)
-}
-
-// Error returns the healthcheck's status, which will be nil if it is healthy.
-func (h *StandardHealthcheck) Error() error {
-	return h.err
-}
-
-// Healthy marks the healthcheck as healthy.
-func (h *StandardHealthcheck) Healthy() {
-	h.err = nil
-}
-
-// Unhealthy marks the healthcheck as unhealthy.  The error is stored and
-// may be retrieved by the Error method.
-func (h *StandardHealthcheck) Unhealthy(err error) {
-	h.err = err
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/histogram.go b/vendor/github.com/rcrowley/go-metrics/histogram.go
deleted file mode 100644
index dbc837fe4..000000000
--- a/vendor/github.com/rcrowley/go-metrics/histogram.go
+++ /dev/null
@@ -1,202 +0,0 @@
-package metrics
-
-// Histograms calculate distribution statistics from a series of int64 values.
-type Histogram interface {
-	Clear()
-	Count() int64
-	Max() int64
-	Mean() float64
-	Min() int64
-	Percentile(float64) float64
-	Percentiles([]float64) []float64
-	Sample() Sample
-	Snapshot() Histogram
-	StdDev() float64
-	Sum() int64
-	Update(int64)
-	Variance() float64
-}
-
-// GetOrRegisterHistogram returns an existing Histogram or constructs and
-// registers a new StandardHistogram.
-func GetOrRegisterHistogram(name string, r Registry, s Sample) Histogram {
-	if nil == r {
-		r = DefaultRegistry
-	}
-	return r.GetOrRegister(name, func() Histogram { return NewHistogram(s) }).(Histogram)
-}
-
-// NewHistogram constructs a new StandardHistogram from a Sample.
-func NewHistogram(s Sample) Histogram {
-	if UseNilMetrics {
-		return NilHistogram{}
-	}
-	return &StandardHistogram{sample: s}
-}
-
-// NewRegisteredHistogram constructs and registers a new StandardHistogram from
-// a Sample.
-func NewRegisteredHistogram(name string, r Registry, s Sample) Histogram {
-	c := NewHistogram(s)
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// HistogramSnapshot is a read-only copy of another Histogram.
-type HistogramSnapshot struct {
-	sample *SampleSnapshot
-}
-
-// Clear panics.
-func (*HistogramSnapshot) Clear() {
-	panic("Clear called on a HistogramSnapshot")
-}
-
-// Count returns the number of samples recorded at the time the snapshot was
-// taken.
-func (h *HistogramSnapshot) Count() int64 { return h.sample.Count() }
-
-// Max returns the maximum value in the sample at the time the snapshot was
-// taken.
-func (h *HistogramSnapshot) Max() int64 { return h.sample.Max() }
-
-// Mean returns the mean of the values in the sample at the time the snapshot
-// was taken.
-func (h *HistogramSnapshot) Mean() float64 { return h.sample.Mean() }
-
-// Min returns the minimum value in the sample at the time the snapshot was
-// taken.
-func (h *HistogramSnapshot) Min() int64 { return h.sample.Min() }
-
-// Percentile returns an arbitrary percentile of values in the sample at the
-// time the snapshot was taken.
-func (h *HistogramSnapshot) Percentile(p float64) float64 {
-	return h.sample.Percentile(p)
-}
-
-// Percentiles returns a slice of arbitrary percentiles of values in the sample
-// at the time the snapshot was taken.
-func (h *HistogramSnapshot) Percentiles(ps []float64) []float64 {
-	return h.sample.Percentiles(ps)
-}
-
-// Sample returns the Sample underlying the histogram.
-func (h *HistogramSnapshot) Sample() Sample { return h.sample }
-
-// Snapshot returns the snapshot.
-func (h *HistogramSnapshot) Snapshot() Histogram { return h }
-
-// StdDev returns the standard deviation of the values in the sample at the
-// time the snapshot was taken.
-func (h *HistogramSnapshot) StdDev() float64 { return h.sample.StdDev() }
-
-// Sum returns the sum in the sample at the time the snapshot was taken.
-func (h *HistogramSnapshot) Sum() int64 { return h.sample.Sum() }
-
-// Update panics.
-func (*HistogramSnapshot) Update(int64) {
-	panic("Update called on a HistogramSnapshot")
-}
-
-// Variance returns the variance of inputs at the time the snapshot was taken.
-func (h *HistogramSnapshot) Variance() float64 { return h.sample.Variance() }
-
-// NilHistogram is a no-op Histogram.
-type NilHistogram struct{}
-
-// Clear is a no-op.
-func (NilHistogram) Clear() {}
-
-// Count is a no-op.
-func (NilHistogram) Count() int64 { return 0 }
-
-// Max is a no-op.
-func (NilHistogram) Max() int64 { return 0 }
-
-// Mean is a no-op.
-func (NilHistogram) Mean() float64 { return 0.0 }
-
-// Min is a no-op.
-func (NilHistogram) Min() int64 { return 0 }
-
-// Percentile is a no-op.
-func (NilHistogram) Percentile(p float64) float64 { return 0.0 }
-
-// Percentiles is a no-op.
-func (NilHistogram) Percentiles(ps []float64) []float64 {
-	return make([]float64, len(ps))
-}
-
-// Sample is a no-op.
-func (NilHistogram) Sample() Sample { return NilSample{} }
-
-// Snapshot is a no-op.
-func (NilHistogram) Snapshot() Histogram { return NilHistogram{} }
-
-// StdDev is a no-op.
-func (NilHistogram) StdDev() float64 { return 0.0 }
-
-// Sum is a no-op.
-func (NilHistogram) Sum() int64 { return 0 }
-
-// Update is a no-op.
-func (NilHistogram) Update(v int64) {}
-
-// Variance is a no-op.
-func (NilHistogram) Variance() float64 { return 0.0 }
-
-// StandardHistogram is the standard implementation of a Histogram and uses a
-// Sample to bound its memory use.
-type StandardHistogram struct {
-	sample Sample
-}
-
-// Clear clears the histogram and its sample.
-func (h *StandardHistogram) Clear() { h.sample.Clear() }
-
-// Count returns the number of samples recorded since the histogram was last
-// cleared.
-func (h *StandardHistogram) Count() int64 { return h.sample.Count() }
-
-// Max returns the maximum value in the sample.
-func (h *StandardHistogram) Max() int64 { return h.sample.Max() }
-
-// Mean returns the mean of the values in the sample.
-func (h *StandardHistogram) Mean() float64 { return h.sample.Mean() }
-
-// Min returns the minimum value in the sample.
-func (h *StandardHistogram) Min() int64 { return h.sample.Min() }
-
-// Percentile returns an arbitrary percentile of the values in the sample.
-func (h *StandardHistogram) Percentile(p float64) float64 {
-	return h.sample.Percentile(p)
-}
-
-// Percentiles returns a slice of arbitrary percentiles of the values in the
-// sample.
-func (h *StandardHistogram) Percentiles(ps []float64) []float64 {
-	return h.sample.Percentiles(ps)
-}
-
-// Sample returns the Sample underlying the histogram.
-func (h *StandardHistogram) Sample() Sample { return h.sample }
-
-// Snapshot returns a read-only copy of the histogram.
-func (h *StandardHistogram) Snapshot() Histogram {
-	return &HistogramSnapshot{sample: h.sample.Snapshot().(*SampleSnapshot)}
-}
-
-// StdDev returns the standard deviation of the values in the sample.
-func (h *StandardHistogram) StdDev() float64 { return h.sample.StdDev() }
-
-// Sum returns the sum in the sample.
-func (h *StandardHistogram) Sum() int64 { return h.sample.Sum() }
-
-// Update samples a new value.
-func (h *StandardHistogram) Update(v int64) { h.sample.Update(v) }
-
-// Variance returns the variance of the values in the sample.
-func (h *StandardHistogram) Variance() float64 { return h.sample.Variance() }
diff --git a/vendor/github.com/rcrowley/go-metrics/json.go b/vendor/github.com/rcrowley/go-metrics/json.go
deleted file mode 100644
index 2fdcbcfbf..000000000
--- a/vendor/github.com/rcrowley/go-metrics/json.go
+++ /dev/null
@@ -1,87 +0,0 @@
-package metrics
-
-import (
-	"encoding/json"
-	"io"
-	"time"
-)
-
-// MarshalJSON returns a byte slice containing a JSON representation of all
-// the metrics in the Registry.
-func (r *StandardRegistry) MarshalJSON() ([]byte, error) {
-	data := make(map[string]map[string]interface{})
-	r.Each(func(name string, i interface{}) {
-		values := make(map[string]interface{})
-		switch metric := i.(type) {
-		case Counter:
-			values["count"] = metric.Count()
-		case Gauge:
-			values["value"] = metric.Value()
-		case GaugeFloat64:
-			values["value"] = metric.Value()
-		case Healthcheck:
-			values["error"] = nil
-			metric.Check()
-			if err := metric.Error(); nil != err {
-				values["error"] = metric.Error().Error()
-			}
-		case Histogram:
-			h := metric.Snapshot()
-			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			values["count"] = h.Count()
-			values["min"] = h.Min()
-			values["max"] = h.Max()
-			values["mean"] = h.Mean()
-			values["stddev"] = h.StdDev()
-			values["median"] = ps[0]
-			values["75%"] = ps[1]
-			values["95%"] = ps[2]
-			values["99%"] = ps[3]
-			values["99.9%"] = ps[4]
-		case Meter:
-			m := metric.Snapshot()
-			values["count"] = m.Count()
-			values["1m.rate"] = m.Rate1()
-			values["5m.rate"] = m.Rate5()
-			values["15m.rate"] = m.Rate15()
-			values["mean.rate"] = m.RateMean()
-		case Timer:
-			t := metric.Snapshot()
-			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			values["count"] = t.Count()
-			values["min"] = t.Min()
-			values["max"] = t.Max()
-			values["mean"] = t.Mean()
-			values["stddev"] = t.StdDev()
-			values["median"] = ps[0]
-			values["75%"] = ps[1]
-			values["95%"] = ps[2]
-			values["99%"] = ps[3]
-			values["99.9%"] = ps[4]
-			values["1m.rate"] = t.Rate1()
-			values["5m.rate"] = t.Rate5()
-			values["15m.rate"] = t.Rate15()
-			values["mean.rate"] = t.RateMean()
-		}
-		data[name] = values
-	})
-	return json.Marshal(data)
-}
-
-// WriteJSON writes metrics from the given registry  periodically to the
-// specified io.Writer as JSON.
-func WriteJSON(r Registry, d time.Duration, w io.Writer) {
-	for _ = range time.Tick(d) {
-		WriteJSONOnce(r, w)
-	}
-}
-
-// WriteJSONOnce writes metrics from the given registry to the specified
-// io.Writer as JSON.
-func WriteJSONOnce(r Registry, w io.Writer) {
-	json.NewEncoder(w).Encode(r)
-}
-
-func (p *PrefixedRegistry) MarshalJSON() ([]byte, error) {
-	return json.Marshal(p.underlying)
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/log.go b/vendor/github.com/rcrowley/go-metrics/log.go
deleted file mode 100644
index f8074c045..000000000
--- a/vendor/github.com/rcrowley/go-metrics/log.go
+++ /dev/null
@@ -1,80 +0,0 @@
-package metrics
-
-import (
-	"time"
-)
-
-type Logger interface {
-	Printf(format string, v ...interface{})
-}
-
-func Log(r Registry, freq time.Duration, l Logger) {
-	LogScaled(r, freq, time.Nanosecond, l)
-}
-
-// Output each metric in the given registry periodically using the given
-// logger. Print timings in `scale` units (eg time.Millisecond) rather than nanos.
-func LogScaled(r Registry, freq time.Duration, scale time.Duration, l Logger) {
-	du := float64(scale)
-	duSuffix := scale.String()[1:]
-
-	for _ = range time.Tick(freq) {
-		r.Each(func(name string, i interface{}) {
-			switch metric := i.(type) {
-			case Counter:
-				l.Printf("counter %s\n", name)
-				l.Printf("  count:       %9d\n", metric.Count())
-			case Gauge:
-				l.Printf("gauge %s\n", name)
-				l.Printf("  value:       %9d\n", metric.Value())
-			case GaugeFloat64:
-				l.Printf("gauge %s\n", name)
-				l.Printf("  value:       %f\n", metric.Value())
-			case Healthcheck:
-				metric.Check()
-				l.Printf("healthcheck %s\n", name)
-				l.Printf("  error:       %v\n", metric.Error())
-			case Histogram:
-				h := metric.Snapshot()
-				ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-				l.Printf("histogram %s\n", name)
-				l.Printf("  count:       %9d\n", h.Count())
-				l.Printf("  min:         %9d\n", h.Min())
-				l.Printf("  max:         %9d\n", h.Max())
-				l.Printf("  mean:        %12.2f\n", h.Mean())
-				l.Printf("  stddev:      %12.2f\n", h.StdDev())
-				l.Printf("  median:      %12.2f\n", ps[0])
-				l.Printf("  75%%:         %12.2f\n", ps[1])
-				l.Printf("  95%%:         %12.2f\n", ps[2])
-				l.Printf("  99%%:         %12.2f\n", ps[3])
-				l.Printf("  99.9%%:       %12.2f\n", ps[4])
-			case Meter:
-				m := metric.Snapshot()
-				l.Printf("meter %s\n", name)
-				l.Printf("  count:       %9d\n", m.Count())
-				l.Printf("  1-min rate:  %12.2f\n", m.Rate1())
-				l.Printf("  5-min rate:  %12.2f\n", m.Rate5())
-				l.Printf("  15-min rate: %12.2f\n", m.Rate15())
-				l.Printf("  mean rate:   %12.2f\n", m.RateMean())
-			case Timer:
-				t := metric.Snapshot()
-				ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-				l.Printf("timer %s\n", name)
-				l.Printf("  count:       %9d\n", t.Count())
-				l.Printf("  min:         %12.2f%s\n", float64(t.Min())/du, duSuffix)
-				l.Printf("  max:         %12.2f%s\n", float64(t.Max())/du, duSuffix)
-				l.Printf("  mean:        %12.2f%s\n", t.Mean()/du, duSuffix)
-				l.Printf("  stddev:      %12.2f%s\n", t.StdDev()/du, duSuffix)
-				l.Printf("  median:      %12.2f%s\n", ps[0]/du, duSuffix)
-				l.Printf("  75%%:         %12.2f%s\n", ps[1]/du, duSuffix)
-				l.Printf("  95%%:         %12.2f%s\n", ps[2]/du, duSuffix)
-				l.Printf("  99%%:         %12.2f%s\n", ps[3]/du, duSuffix)
-				l.Printf("  99.9%%:       %12.2f%s\n", ps[4]/du, duSuffix)
-				l.Printf("  1-min rate:  %12.2f\n", t.Rate1())
-				l.Printf("  5-min rate:  %12.2f\n", t.Rate5())
-				l.Printf("  15-min rate: %12.2f\n", t.Rate15())
-				l.Printf("  mean rate:   %12.2f\n", t.RateMean())
-			}
-		})
-	}
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/memory.md b/vendor/github.com/rcrowley/go-metrics/memory.md
deleted file mode 100644
index 47454f54b..000000000
--- a/vendor/github.com/rcrowley/go-metrics/memory.md
+++ /dev/null
@@ -1,285 +0,0 @@
-Memory usage
-============
-
-(Highly unscientific.)
-
-Command used to gather static memory usage:
-
-```sh
-grep ^Vm "/proc/$(ps fax | grep [m]etrics-bench | awk '{print $1}')/status"
-```
-
-Program used to gather baseline memory usage:
-
-```go
-package main
-
-import "time"
-
-func main() {
-	time.Sleep(600e9)
-}
-```
-
-Baseline
---------
-
-```
-VmPeak:    42604 kB
-VmSize:    42604 kB
-VmLck:         0 kB
-VmHWM:      1120 kB
-VmRSS:      1120 kB
-VmData:    35460 kB
-VmStk:       136 kB
-VmExe:      1020 kB
-VmLib:      1848 kB
-VmPTE:        36 kB
-VmSwap:        0 kB
-```
-
-Program used to gather metric memory usage (with other metrics being similar):
-
-```go
-package main
-
-import (
-	"fmt"
-	"metrics"
-	"time"
-)
-
-func main() {
-	fmt.Sprintf("foo")
-	metrics.NewRegistry()
-	time.Sleep(600e9)
-}
-```
-
-1000 counters registered
-------------------------
-
-```
-VmPeak:    44016 kB
-VmSize:    44016 kB
-VmLck:         0 kB
-VmHWM:      1928 kB
-VmRSS:      1928 kB
-VmData:    36868 kB
-VmStk:       136 kB
-VmExe:      1024 kB
-VmLib:      1848 kB
-VmPTE:        40 kB
-VmSwap:        0 kB
-```
-
-**1.412 kB virtual, TODO 0.808 kB resident per counter.**
-
-100000 counters registered
---------------------------
-
-```
-VmPeak:    55024 kB
-VmSize:    55024 kB
-VmLck:         0 kB
-VmHWM:     12440 kB
-VmRSS:     12440 kB
-VmData:    47876 kB
-VmStk:       136 kB
-VmExe:      1024 kB
-VmLib:      1848 kB
-VmPTE:        64 kB
-VmSwap:        0 kB
-```
-
-**0.1242 kB virtual, 0.1132 kB resident per counter.**
-
-1000 gauges registered
-----------------------
-
-```
-VmPeak:    44012 kB
-VmSize:    44012 kB
-VmLck:         0 kB
-VmHWM:      1928 kB
-VmRSS:      1928 kB
-VmData:    36868 kB
-VmStk:       136 kB
-VmExe:      1020 kB
-VmLib:      1848 kB
-VmPTE:        40 kB
-VmSwap:        0 kB
-```
-
-**1.408 kB virtual, 0.808 kB resident per counter.**
-
-100000 gauges registered
-------------------------
-
-```
-VmPeak:    55020 kB
-VmSize:    55020 kB
-VmLck:         0 kB
-VmHWM:     12432 kB
-VmRSS:     12432 kB
-VmData:    47876 kB
-VmStk:       136 kB
-VmExe:      1020 kB
-VmLib:      1848 kB
-VmPTE:        60 kB
-VmSwap:        0 kB
-```
-
-**0.12416 kB virtual, 0.11312 resident per gauge.**
-
-1000 histograms with a uniform sample size of 1028
---------------------------------------------------
-
-```
-VmPeak:    72272 kB
-VmSize:    72272 kB
-VmLck:         0 kB
-VmHWM:     16204 kB
-VmRSS:     16204 kB
-VmData:    65100 kB
-VmStk:       136 kB
-VmExe:      1048 kB
-VmLib:      1848 kB
-VmPTE:        80 kB
-VmSwap:        0 kB
-```
-
-**29.668 kB virtual, TODO 15.084 resident per histogram.**
-
-10000 histograms with a uniform sample size of 1028
----------------------------------------------------
-
-```
-VmPeak:   256912 kB
-VmSize:   256912 kB
-VmLck:         0 kB
-VmHWM:    146204 kB
-VmRSS:    146204 kB
-VmData:   249740 kB
-VmStk:       136 kB
-VmExe:      1048 kB
-VmLib:      1848 kB
-VmPTE:       448 kB
-VmSwap:        0 kB
-```
-
-**21.4308 kB virtual, 14.5084 kB resident per histogram.**
-
-50000 histograms with a uniform sample size of 1028
----------------------------------------------------
-
-```
-VmPeak:   908112 kB
-VmSize:   908112 kB
-VmLck:         0 kB
-VmHWM:    645832 kB
-VmRSS:    645588 kB
-VmData:   900940 kB
-VmStk:       136 kB
-VmExe:      1048 kB
-VmLib:      1848 kB
-VmPTE:      1716 kB
-VmSwap:     1544 kB
-```
-
-**17.31016 kB virtual, 12.88936 kB resident per histogram.**
-
-1000 histograms with an exponentially-decaying sample size of 1028 and alpha of 0.015
--------------------------------------------------------------------------------------
-
-```
-VmPeak:    62480 kB
-VmSize:    62480 kB
-VmLck:         0 kB
-VmHWM:     11572 kB
-VmRSS:     11572 kB
-VmData:    55308 kB
-VmStk:       136 kB
-VmExe:      1048 kB
-VmLib:      1848 kB
-VmPTE:        64 kB
-VmSwap:        0 kB
-```
-
-**19.876 kB virtual, 10.452 kB resident per histogram.**
-
-10000 histograms with an exponentially-decaying sample size of 1028 and alpha of 0.015
---------------------------------------------------------------------------------------
-
-```
-VmPeak:   153296 kB
-VmSize:   153296 kB
-VmLck:         0 kB
-VmHWM:    101176 kB
-VmRSS:    101176 kB
-VmData:   146124 kB
-VmStk:       136 kB
-VmExe:      1048 kB
-VmLib:      1848 kB
-VmPTE:       240 kB
-VmSwap:        0 kB
-```
-
-**11.0692 kB virtual, 10.0056 kB resident per histogram.**
-
-50000 histograms with an exponentially-decaying sample size of 1028 and alpha of 0.015
---------------------------------------------------------------------------------------
-
-```
-VmPeak:   557264 kB
-VmSize:   557264 kB
-VmLck:         0 kB
-VmHWM:    501056 kB
-VmRSS:    501056 kB
-VmData:   550092 kB
-VmStk:       136 kB
-VmExe:      1048 kB
-VmLib:      1848 kB
-VmPTE:      1032 kB
-VmSwap:        0 kB
-```
-
-**10.2932 kB virtual, 9.99872 kB resident per histogram.**
-
-1000 meters
------------
-
-```
-VmPeak:    74504 kB
-VmSize:    74504 kB
-VmLck:         0 kB
-VmHWM:     24124 kB
-VmRSS:     24124 kB
-VmData:    67340 kB
-VmStk:       136 kB
-VmExe:      1040 kB
-VmLib:      1848 kB
-VmPTE:        92 kB
-VmSwap:        0 kB
-```
-
-**31.9 kB virtual, 23.004 kB resident per meter.**
-
-10000 meters
-------------
-
-```
-VmPeak:   278920 kB
-VmSize:   278920 kB
-VmLck:         0 kB
-VmHWM:    227300 kB
-VmRSS:    227300 kB
-VmData:   271756 kB
-VmStk:       136 kB
-VmExe:      1040 kB
-VmLib:      1848 kB
-VmPTE:       488 kB
-VmSwap:        0 kB
-```
-
-**23.6316 kB virtual, 22.618 kB resident per meter.**
diff --git a/vendor/github.com/rcrowley/go-metrics/meter.go b/vendor/github.com/rcrowley/go-metrics/meter.go
deleted file mode 100644
index 0389ab0b8..000000000
--- a/vendor/github.com/rcrowley/go-metrics/meter.go
+++ /dev/null
@@ -1,233 +0,0 @@
-package metrics
-
-import (
-	"sync"
-	"time"
-)
-
-// Meters count events to produce exponentially-weighted moving average rates
-// at one-, five-, and fifteen-minutes and a mean rate.
-type Meter interface {
-	Count() int64
-	Mark(int64)
-	Rate1() float64
-	Rate5() float64
-	Rate15() float64
-	RateMean() float64
-	Snapshot() Meter
-}
-
-// GetOrRegisterMeter returns an existing Meter or constructs and registers a
-// new StandardMeter.
-func GetOrRegisterMeter(name string, r Registry) Meter {
-	if nil == r {
-		r = DefaultRegistry
-	}
-	return r.GetOrRegister(name, NewMeter).(Meter)
-}
-
-// NewMeter constructs a new StandardMeter and launches a goroutine.
-func NewMeter() Meter {
-	if UseNilMetrics {
-		return NilMeter{}
-	}
-	m := newStandardMeter()
-	arbiter.Lock()
-	defer arbiter.Unlock()
-	arbiter.meters = append(arbiter.meters, m)
-	if !arbiter.started {
-		arbiter.started = true
-		go arbiter.tick()
-	}
-	return m
-}
-
-// NewMeter constructs and registers a new StandardMeter and launches a
-// goroutine.
-func NewRegisteredMeter(name string, r Registry) Meter {
-	c := NewMeter()
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// MeterSnapshot is a read-only copy of another Meter.
-type MeterSnapshot struct {
-	count                          int64
-	rate1, rate5, rate15, rateMean float64
-}
-
-// Count returns the count of events at the time the snapshot was taken.
-func (m *MeterSnapshot) Count() int64 { return m.count }
-
-// Mark panics.
-func (*MeterSnapshot) Mark(n int64) {
-	panic("Mark called on a MeterSnapshot")
-}
-
-// Rate1 returns the one-minute moving average rate of events per second at the
-// time the snapshot was taken.
-func (m *MeterSnapshot) Rate1() float64 { return m.rate1 }
-
-// Rate5 returns the five-minute moving average rate of events per second at
-// the time the snapshot was taken.
-func (m *MeterSnapshot) Rate5() float64 { return m.rate5 }
-
-// Rate15 returns the fifteen-minute moving average rate of events per second
-// at the time the snapshot was taken.
-func (m *MeterSnapshot) Rate15() float64 { return m.rate15 }
-
-// RateMean returns the meter's mean rate of events per second at the time the
-// snapshot was taken.
-func (m *MeterSnapshot) RateMean() float64 { return m.rateMean }
-
-// Snapshot returns the snapshot.
-func (m *MeterSnapshot) Snapshot() Meter { return m }
-
-// NilMeter is a no-op Meter.
-type NilMeter struct{}
-
-// Count is a no-op.
-func (NilMeter) Count() int64 { return 0 }
-
-// Mark is a no-op.
-func (NilMeter) Mark(n int64) {}
-
-// Rate1 is a no-op.
-func (NilMeter) Rate1() float64 { return 0.0 }
-
-// Rate5 is a no-op.
-func (NilMeter) Rate5() float64 { return 0.0 }
-
-// Rate15is a no-op.
-func (NilMeter) Rate15() float64 { return 0.0 }
-
-// RateMean is a no-op.
-func (NilMeter) RateMean() float64 { return 0.0 }
-
-// Snapshot is a no-op.
-func (NilMeter) Snapshot() Meter { return NilMeter{} }
-
-// StandardMeter is the standard implementation of a Meter.
-type StandardMeter struct {
-	lock        sync.RWMutex
-	snapshot    *MeterSnapshot
-	a1, a5, a15 EWMA
-	startTime   time.Time
-}
-
-func newStandardMeter() *StandardMeter {
-	return &StandardMeter{
-		snapshot:  &MeterSnapshot{},
-		a1:        NewEWMA1(),
-		a5:        NewEWMA5(),
-		a15:       NewEWMA15(),
-		startTime: time.Now(),
-	}
-}
-
-// Count returns the number of events recorded.
-func (m *StandardMeter) Count() int64 {
-	m.lock.RLock()
-	count := m.snapshot.count
-	m.lock.RUnlock()
-	return count
-}
-
-// Mark records the occurance of n events.
-func (m *StandardMeter) Mark(n int64) {
-	m.lock.Lock()
-	defer m.lock.Unlock()
-	m.snapshot.count += n
-	m.a1.Update(n)
-	m.a5.Update(n)
-	m.a15.Update(n)
-	m.updateSnapshot()
-}
-
-// Rate1 returns the one-minute moving average rate of events per second.
-func (m *StandardMeter) Rate1() float64 {
-	m.lock.RLock()
-	rate1 := m.snapshot.rate1
-	m.lock.RUnlock()
-	return rate1
-}
-
-// Rate5 returns the five-minute moving average rate of events per second.
-func (m *StandardMeter) Rate5() float64 {
-	m.lock.RLock()
-	rate5 := m.snapshot.rate5
-	m.lock.RUnlock()
-	return rate5
-}
-
-// Rate15 returns the fifteen-minute moving average rate of events per second.
-func (m *StandardMeter) Rate15() float64 {
-	m.lock.RLock()
-	rate15 := m.snapshot.rate15
-	m.lock.RUnlock()
-	return rate15
-}
-
-// RateMean returns the meter's mean rate of events per second.
-func (m *StandardMeter) RateMean() float64 {
-	m.lock.RLock()
-	rateMean := m.snapshot.rateMean
-	m.lock.RUnlock()
-	return rateMean
-}
-
-// Snapshot returns a read-only copy of the meter.
-func (m *StandardMeter) Snapshot() Meter {
-	m.lock.RLock()
-	snapshot := *m.snapshot
-	m.lock.RUnlock()
-	return &snapshot
-}
-
-func (m *StandardMeter) updateSnapshot() {
-	// should run with write lock held on m.lock
-	snapshot := m.snapshot
-	snapshot.rate1 = m.a1.Rate()
-	snapshot.rate5 = m.a5.Rate()
-	snapshot.rate15 = m.a15.Rate()
-	snapshot.rateMean = float64(snapshot.count) / time.Since(m.startTime).Seconds()
-}
-
-func (m *StandardMeter) tick() {
-	m.lock.Lock()
-	defer m.lock.Unlock()
-	m.a1.Tick()
-	m.a5.Tick()
-	m.a15.Tick()
-	m.updateSnapshot()
-}
-
-type meterArbiter struct {
-	sync.RWMutex
-	started bool
-	meters  []*StandardMeter
-	ticker  *time.Ticker
-}
-
-var arbiter = meterArbiter{ticker: time.NewTicker(5e9)}
-
-// Ticks meters on the scheduled interval
-func (ma *meterArbiter) tick() {
-	for {
-		select {
-		case <-ma.ticker.C:
-			ma.tickMeters()
-		}
-	}
-}
-
-func (ma *meterArbiter) tickMeters() {
-	ma.RLock()
-	defer ma.RUnlock()
-	for _, meter := range ma.meters {
-		meter.tick()
-	}
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/metrics.go b/vendor/github.com/rcrowley/go-metrics/metrics.go
deleted file mode 100644
index b97a49ed1..000000000
--- a/vendor/github.com/rcrowley/go-metrics/metrics.go
+++ /dev/null
@@ -1,13 +0,0 @@
-// Go port of Coda Hale's Metrics library
-//
-// <https://github.com/rcrowley/go-metrics>
-//
-// Coda Hale's original work: <https://github.com/codahale/metrics>
-package metrics
-
-// UseNilMetrics is checked by the constructor functions for all of the
-// standard metrics.  If it is true, the metric returned is a stub.
-//
-// This global kill-switch helps quantify the observer effect and makes
-// for less cluttered pprof profiles.
-var UseNilMetrics bool = false
diff --git a/vendor/github.com/rcrowley/go-metrics/opentsdb.go b/vendor/github.com/rcrowley/go-metrics/opentsdb.go
deleted file mode 100644
index 266b6c93d..000000000
--- a/vendor/github.com/rcrowley/go-metrics/opentsdb.go
+++ /dev/null
@@ -1,119 +0,0 @@
-package metrics
-
-import (
-	"bufio"
-	"fmt"
-	"log"
-	"net"
-	"os"
-	"strings"
-	"time"
-)
-
-var shortHostName string = ""
-
-// OpenTSDBConfig provides a container with configuration parameters for
-// the OpenTSDB exporter
-type OpenTSDBConfig struct {
-	Addr          *net.TCPAddr  // Network address to connect to
-	Registry      Registry      // Registry to be exported
-	FlushInterval time.Duration // Flush interval
-	DurationUnit  time.Duration // Time conversion unit for durations
-	Prefix        string        // Prefix to be prepended to metric names
-}
-
-// OpenTSDB is a blocking exporter function which reports metrics in r
-// to a TSDB server located at addr, flushing them every d duration
-// and prepending metric names with prefix.
-func OpenTSDB(r Registry, d time.Duration, prefix string, addr *net.TCPAddr) {
-	OpenTSDBWithConfig(OpenTSDBConfig{
-		Addr:          addr,
-		Registry:      r,
-		FlushInterval: d,
-		DurationUnit:  time.Nanosecond,
-		Prefix:        prefix,
-	})
-}
-
-// OpenTSDBWithConfig is a blocking exporter function just like OpenTSDB,
-// but it takes a OpenTSDBConfig instead.
-func OpenTSDBWithConfig(c OpenTSDBConfig) {
-	for _ = range time.Tick(c.FlushInterval) {
-		if err := openTSDB(&c); nil != err {
-			log.Println(err)
-		}
-	}
-}
-
-func getShortHostname() string {
-	if shortHostName == "" {
-		host, _ := os.Hostname()
-		if index := strings.Index(host, "."); index > 0 {
-			shortHostName = host[:index]
-		} else {
-			shortHostName = host
-		}
-	}
-	return shortHostName
-}
-
-func openTSDB(c *OpenTSDBConfig) error {
-	shortHostname := getShortHostname()
-	now := time.Now().Unix()
-	du := float64(c.DurationUnit)
-	conn, err := net.DialTCP("tcp", nil, c.Addr)
-	if nil != err {
-		return err
-	}
-	defer conn.Close()
-	w := bufio.NewWriter(conn)
-	c.Registry.Each(func(name string, i interface{}) {
-		switch metric := i.(type) {
-		case Counter:
-			fmt.Fprintf(w, "put %s.%s.count %d %d host=%s\n", c.Prefix, name, now, metric.Count(), shortHostname)
-		case Gauge:
-			fmt.Fprintf(w, "put %s.%s.value %d %d host=%s\n", c.Prefix, name, now, metric.Value(), shortHostname)
-		case GaugeFloat64:
-			fmt.Fprintf(w, "put %s.%s.value %d %f host=%s\n", c.Prefix, name, now, metric.Value(), shortHostname)
-		case Histogram:
-			h := metric.Snapshot()
-			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			fmt.Fprintf(w, "put %s.%s.count %d %d host=%s\n", c.Prefix, name, now, h.Count(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.min %d %d host=%s\n", c.Prefix, name, now, h.Min(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.max %d %d host=%s\n", c.Prefix, name, now, h.Max(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.mean %d %.2f host=%s\n", c.Prefix, name, now, h.Mean(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.std-dev %d %.2f host=%s\n", c.Prefix, name, now, h.StdDev(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.50-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[0], shortHostname)
-			fmt.Fprintf(w, "put %s.%s.75-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[1], shortHostname)
-			fmt.Fprintf(w, "put %s.%s.95-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[2], shortHostname)
-			fmt.Fprintf(w, "put %s.%s.99-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[3], shortHostname)
-			fmt.Fprintf(w, "put %s.%s.999-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[4], shortHostname)
-		case Meter:
-			m := metric.Snapshot()
-			fmt.Fprintf(w, "put %s.%s.count %d %d host=%s\n", c.Prefix, name, now, m.Count(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.one-minute %d %.2f host=%s\n", c.Prefix, name, now, m.Rate1(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.five-minute %d %.2f host=%s\n", c.Prefix, name, now, m.Rate5(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.fifteen-minute %d %.2f host=%s\n", c.Prefix, name, now, m.Rate15(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.mean %d %.2f host=%s\n", c.Prefix, name, now, m.RateMean(), shortHostname)
-		case Timer:
-			t := metric.Snapshot()
-			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			fmt.Fprintf(w, "put %s.%s.count %d %d host=%s\n", c.Prefix, name, now, t.Count(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.min %d %d host=%s\n", c.Prefix, name, now, t.Min()/int64(du), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.max %d %d host=%s\n", c.Prefix, name, now, t.Max()/int64(du), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.mean %d %.2f host=%s\n", c.Prefix, name, now, t.Mean()/du, shortHostname)
-			fmt.Fprintf(w, "put %s.%s.std-dev %d %.2f host=%s\n", c.Prefix, name, now, t.StdDev()/du, shortHostname)
-			fmt.Fprintf(w, "put %s.%s.50-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[0]/du, shortHostname)
-			fmt.Fprintf(w, "put %s.%s.75-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[1]/du, shortHostname)
-			fmt.Fprintf(w, "put %s.%s.95-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[2]/du, shortHostname)
-			fmt.Fprintf(w, "put %s.%s.99-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[3]/du, shortHostname)
-			fmt.Fprintf(w, "put %s.%s.999-percentile %d %.2f host=%s\n", c.Prefix, name, now, ps[4]/du, shortHostname)
-			fmt.Fprintf(w, "put %s.%s.one-minute %d %.2f host=%s\n", c.Prefix, name, now, t.Rate1(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.five-minute %d %.2f host=%s\n", c.Prefix, name, now, t.Rate5(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.fifteen-minute %d %.2f host=%s\n", c.Prefix, name, now, t.Rate15(), shortHostname)
-			fmt.Fprintf(w, "put %s.%s.mean-rate %d %.2f host=%s\n", c.Prefix, name, now, t.RateMean(), shortHostname)
-		}
-		w.Flush()
-	})
-	return nil
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/registry.go b/vendor/github.com/rcrowley/go-metrics/registry.go
deleted file mode 100644
index 2bb7a1e7d..000000000
--- a/vendor/github.com/rcrowley/go-metrics/registry.go
+++ /dev/null
@@ -1,270 +0,0 @@
-package metrics
-
-import (
-	"fmt"
-	"reflect"
-	"strings"
-	"sync"
-)
-
-// DuplicateMetric is the error returned by Registry.Register when a metric
-// already exists.  If you mean to Register that metric you must first
-// Unregister the existing metric.
-type DuplicateMetric string
-
-func (err DuplicateMetric) Error() string {
-	return fmt.Sprintf("duplicate metric: %s", string(err))
-}
-
-// A Registry holds references to a set of metrics by name and can iterate
-// over them, calling callback functions provided by the user.
-//
-// This is an interface so as to encourage other structs to implement
-// the Registry API as appropriate.
-type Registry interface {
-
-	// Call the given function for each registered metric.
-	Each(func(string, interface{}))
-
-	// Get the metric by the given name or nil if none is registered.
-	Get(string) interface{}
-
-	// Gets an existing metric or registers the given one.
-	// The interface can be the metric to register if not found in registry,
-	// or a function returning the metric for lazy instantiation.
-	GetOrRegister(string, interface{}) interface{}
-
-	// Register the given metric under the given name.
-	Register(string, interface{}) error
-
-	// Run all registered healthchecks.
-	RunHealthchecks()
-
-	// Unregister the metric with the given name.
-	Unregister(string)
-
-	// Unregister all metrics.  (Mostly for testing.)
-	UnregisterAll()
-}
-
-// The standard implementation of a Registry is a mutex-protected map
-// of names to metrics.
-type StandardRegistry struct {
-	metrics map[string]interface{}
-	mutex   sync.Mutex
-}
-
-// Create a new registry.
-func NewRegistry() Registry {
-	return &StandardRegistry{metrics: make(map[string]interface{})}
-}
-
-// Call the given function for each registered metric.
-func (r *StandardRegistry) Each(f func(string, interface{})) {
-	for name, i := range r.registered() {
-		f(name, i)
-	}
-}
-
-// Get the metric by the given name or nil if none is registered.
-func (r *StandardRegistry) Get(name string) interface{} {
-	r.mutex.Lock()
-	defer r.mutex.Unlock()
-	return r.metrics[name]
-}
-
-// Gets an existing metric or creates and registers a new one. Threadsafe
-// alternative to calling Get and Register on failure.
-// The interface can be the metric to register if not found in registry,
-// or a function returning the metric for lazy instantiation.
-func (r *StandardRegistry) GetOrRegister(name string, i interface{}) interface{} {
-	r.mutex.Lock()
-	defer r.mutex.Unlock()
-	if metric, ok := r.metrics[name]; ok {
-		return metric
-	}
-	if v := reflect.ValueOf(i); v.Kind() == reflect.Func {
-		i = v.Call(nil)[0].Interface()
-	}
-	r.register(name, i)
-	return i
-}
-
-// Register the given metric under the given name.  Returns a DuplicateMetric
-// if a metric by the given name is already registered.
-func (r *StandardRegistry) Register(name string, i interface{}) error {
-	r.mutex.Lock()
-	defer r.mutex.Unlock()
-	return r.register(name, i)
-}
-
-// Run all registered healthchecks.
-func (r *StandardRegistry) RunHealthchecks() {
-	r.mutex.Lock()
-	defer r.mutex.Unlock()
-	for _, i := range r.metrics {
-		if h, ok := i.(Healthcheck); ok {
-			h.Check()
-		}
-	}
-}
-
-// Unregister the metric with the given name.
-func (r *StandardRegistry) Unregister(name string) {
-	r.mutex.Lock()
-	defer r.mutex.Unlock()
-	delete(r.metrics, name)
-}
-
-// Unregister all metrics.  (Mostly for testing.)
-func (r *StandardRegistry) UnregisterAll() {
-	r.mutex.Lock()
-	defer r.mutex.Unlock()
-	for name, _ := range r.metrics {
-		delete(r.metrics, name)
-	}
-}
-
-func (r *StandardRegistry) register(name string, i interface{}) error {
-	if _, ok := r.metrics[name]; ok {
-		return DuplicateMetric(name)
-	}
-	switch i.(type) {
-	case Counter, Gauge, GaugeFloat64, Healthcheck, Histogram, Meter, Timer:
-		r.metrics[name] = i
-	}
-	return nil
-}
-
-func (r *StandardRegistry) registered() map[string]interface{} {
-	r.mutex.Lock()
-	defer r.mutex.Unlock()
-	metrics := make(map[string]interface{}, len(r.metrics))
-	for name, i := range r.metrics {
-		metrics[name] = i
-	}
-	return metrics
-}
-
-type PrefixedRegistry struct {
-	underlying Registry
-	prefix     string
-}
-
-func NewPrefixedRegistry(prefix string) Registry {
-	return &PrefixedRegistry{
-		underlying: NewRegistry(),
-		prefix:     prefix,
-	}
-}
-
-func NewPrefixedChildRegistry(parent Registry, prefix string) Registry {
-	return &PrefixedRegistry{
-		underlying: parent,
-		prefix:     prefix,
-	}
-}
-
-// Call the given function for each registered metric.
-func (r *PrefixedRegistry) Each(fn func(string, interface{})) {
-	wrappedFn := func(prefix string) func(string, interface{}) {
-		return func(name string, iface interface{}) {
-			if strings.HasPrefix(name, prefix) {
-				fn(name, iface)
-			} else {
-				return
-			}
-		}
-	}
-
-	baseRegistry, prefix := findPrefix(r, "")
-	baseRegistry.Each(wrappedFn(prefix))
-}
-
-func findPrefix(registry Registry, prefix string) (Registry, string) {
-	switch r := registry.(type) {
-	case *PrefixedRegistry:
-		return findPrefix(r.underlying, r.prefix+prefix)
-	case *StandardRegistry:
-		return r, prefix
-	}
-	return nil, ""
-}
-
-// Get the metric by the given name or nil if none is registered.
-func (r *PrefixedRegistry) Get(name string) interface{} {
-	realName := r.prefix + name
-	return r.underlying.Get(realName)
-}
-
-// Gets an existing metric or registers the given one.
-// The interface can be the metric to register if not found in registry,
-// or a function returning the metric for lazy instantiation.
-func (r *PrefixedRegistry) GetOrRegister(name string, metric interface{}) interface{} {
-	realName := r.prefix + name
-	return r.underlying.GetOrRegister(realName, metric)
-}
-
-// Register the given metric under the given name. The name will be prefixed.
-func (r *PrefixedRegistry) Register(name string, metric interface{}) error {
-	realName := r.prefix + name
-	return r.underlying.Register(realName, metric)
-}
-
-// Run all registered healthchecks.
-func (r *PrefixedRegistry) RunHealthchecks() {
-	r.underlying.RunHealthchecks()
-}
-
-// Unregister the metric with the given name. The name will be prefixed.
-func (r *PrefixedRegistry) Unregister(name string) {
-	realName := r.prefix + name
-	r.underlying.Unregister(realName)
-}
-
-// Unregister all metrics.  (Mostly for testing.)
-func (r *PrefixedRegistry) UnregisterAll() {
-	r.underlying.UnregisterAll()
-}
-
-var DefaultRegistry Registry = NewRegistry()
-
-// Call the given function for each registered metric.
-func Each(f func(string, interface{})) {
-	DefaultRegistry.Each(f)
-}
-
-// Get the metric by the given name or nil if none is registered.
-func Get(name string) interface{} {
-	return DefaultRegistry.Get(name)
-}
-
-// Gets an existing metric or creates and registers a new one. Threadsafe
-// alternative to calling Get and Register on failure.
-func GetOrRegister(name string, i interface{}) interface{} {
-	return DefaultRegistry.GetOrRegister(name, i)
-}
-
-// Register the given metric under the given name.  Returns a DuplicateMetric
-// if a metric by the given name is already registered.
-func Register(name string, i interface{}) error {
-	return DefaultRegistry.Register(name, i)
-}
-
-// Register the given metric under the given name.  Panics if a metric by the
-// given name is already registered.
-func MustRegister(name string, i interface{}) {
-	if err := Register(name, i); err != nil {
-		panic(err)
-	}
-}
-
-// Run all registered healthchecks.
-func RunHealthchecks() {
-	DefaultRegistry.RunHealthchecks()
-}
-
-// Unregister the metric with the given name.
-func Unregister(name string) {
-	DefaultRegistry.Unregister(name)
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/runtime.go b/vendor/github.com/rcrowley/go-metrics/runtime.go
deleted file mode 100644
index 11c6b785a..000000000
--- a/vendor/github.com/rcrowley/go-metrics/runtime.go
+++ /dev/null
@@ -1,212 +0,0 @@
-package metrics
-
-import (
-	"runtime"
-	"runtime/pprof"
-	"time"
-)
-
-var (
-	memStats       runtime.MemStats
-	runtimeMetrics struct {
-		MemStats struct {
-			Alloc         Gauge
-			BuckHashSys   Gauge
-			DebugGC       Gauge
-			EnableGC      Gauge
-			Frees         Gauge
-			HeapAlloc     Gauge
-			HeapIdle      Gauge
-			HeapInuse     Gauge
-			HeapObjects   Gauge
-			HeapReleased  Gauge
-			HeapSys       Gauge
-			LastGC        Gauge
-			Lookups       Gauge
-			Mallocs       Gauge
-			MCacheInuse   Gauge
-			MCacheSys     Gauge
-			MSpanInuse    Gauge
-			MSpanSys      Gauge
-			NextGC        Gauge
-			NumGC         Gauge
-			GCCPUFraction GaugeFloat64
-			PauseNs       Histogram
-			PauseTotalNs  Gauge
-			StackInuse    Gauge
-			StackSys      Gauge
-			Sys           Gauge
-			TotalAlloc    Gauge
-		}
-		NumCgoCall   Gauge
-		NumGoroutine Gauge
-		NumThread    Gauge
-		ReadMemStats Timer
-	}
-	frees       uint64
-	lookups     uint64
-	mallocs     uint64
-	numGC       uint32
-	numCgoCalls int64
-
-	threadCreateProfile = pprof.Lookup("threadcreate")
-)
-
-// Capture new values for the Go runtime statistics exported in
-// runtime.MemStats.  This is designed to be called as a goroutine.
-func CaptureRuntimeMemStats(r Registry, d time.Duration) {
-	for _ = range time.Tick(d) {
-		CaptureRuntimeMemStatsOnce(r)
-	}
-}
-
-// Capture new values for the Go runtime statistics exported in
-// runtime.MemStats.  This is designed to be called in a background
-// goroutine.  Giving a registry which has not been given to
-// RegisterRuntimeMemStats will panic.
-//
-// Be very careful with this because runtime.ReadMemStats calls the C
-// functions runtime·semacquire(&runtime·worldsema) and runtime·stoptheworld()
-// and that last one does what it says on the tin.
-func CaptureRuntimeMemStatsOnce(r Registry) {
-	t := time.Now()
-	runtime.ReadMemStats(&memStats) // This takes 50-200us.
-	runtimeMetrics.ReadMemStats.UpdateSince(t)
-
-	runtimeMetrics.MemStats.Alloc.Update(int64(memStats.Alloc))
-	runtimeMetrics.MemStats.BuckHashSys.Update(int64(memStats.BuckHashSys))
-	if memStats.DebugGC {
-		runtimeMetrics.MemStats.DebugGC.Update(1)
-	} else {
-		runtimeMetrics.MemStats.DebugGC.Update(0)
-	}
-	if memStats.EnableGC {
-		runtimeMetrics.MemStats.EnableGC.Update(1)
-	} else {
-		runtimeMetrics.MemStats.EnableGC.Update(0)
-	}
-
-	runtimeMetrics.MemStats.Frees.Update(int64(memStats.Frees - frees))
-	runtimeMetrics.MemStats.HeapAlloc.Update(int64(memStats.HeapAlloc))
-	runtimeMetrics.MemStats.HeapIdle.Update(int64(memStats.HeapIdle))
-	runtimeMetrics.MemStats.HeapInuse.Update(int64(memStats.HeapInuse))
-	runtimeMetrics.MemStats.HeapObjects.Update(int64(memStats.HeapObjects))
-	runtimeMetrics.MemStats.HeapReleased.Update(int64(memStats.HeapReleased))
-	runtimeMetrics.MemStats.HeapSys.Update(int64(memStats.HeapSys))
-	runtimeMetrics.MemStats.LastGC.Update(int64(memStats.LastGC))
-	runtimeMetrics.MemStats.Lookups.Update(int64(memStats.Lookups - lookups))
-	runtimeMetrics.MemStats.Mallocs.Update(int64(memStats.Mallocs - mallocs))
-	runtimeMetrics.MemStats.MCacheInuse.Update(int64(memStats.MCacheInuse))
-	runtimeMetrics.MemStats.MCacheSys.Update(int64(memStats.MCacheSys))
-	runtimeMetrics.MemStats.MSpanInuse.Update(int64(memStats.MSpanInuse))
-	runtimeMetrics.MemStats.MSpanSys.Update(int64(memStats.MSpanSys))
-	runtimeMetrics.MemStats.NextGC.Update(int64(memStats.NextGC))
-	runtimeMetrics.MemStats.NumGC.Update(int64(memStats.NumGC - numGC))
-	runtimeMetrics.MemStats.GCCPUFraction.Update(gcCPUFraction(&memStats))
-
-	// <https://code.google.com/p/go/source/browse/src/pkg/runtime/mgc0.c>
-	i := numGC % uint32(len(memStats.PauseNs))
-	ii := memStats.NumGC % uint32(len(memStats.PauseNs))
-	if memStats.NumGC-numGC >= uint32(len(memStats.PauseNs)) {
-		for i = 0; i < uint32(len(memStats.PauseNs)); i++ {
-			runtimeMetrics.MemStats.PauseNs.Update(int64(memStats.PauseNs[i]))
-		}
-	} else {
-		if i > ii {
-			for ; i < uint32(len(memStats.PauseNs)); i++ {
-				runtimeMetrics.MemStats.PauseNs.Update(int64(memStats.PauseNs[i]))
-			}
-			i = 0
-		}
-		for ; i < ii; i++ {
-			runtimeMetrics.MemStats.PauseNs.Update(int64(memStats.PauseNs[i]))
-		}
-	}
-	frees = memStats.Frees
-	lookups = memStats.Lookups
-	mallocs = memStats.Mallocs
-	numGC = memStats.NumGC
-
-	runtimeMetrics.MemStats.PauseTotalNs.Update(int64(memStats.PauseTotalNs))
-	runtimeMetrics.MemStats.StackInuse.Update(int64(memStats.StackInuse))
-	runtimeMetrics.MemStats.StackSys.Update(int64(memStats.StackSys))
-	runtimeMetrics.MemStats.Sys.Update(int64(memStats.Sys))
-	runtimeMetrics.MemStats.TotalAlloc.Update(int64(memStats.TotalAlloc))
-
-	currentNumCgoCalls := numCgoCall()
-	runtimeMetrics.NumCgoCall.Update(currentNumCgoCalls - numCgoCalls)
-	numCgoCalls = currentNumCgoCalls
-
-	runtimeMetrics.NumGoroutine.Update(int64(runtime.NumGoroutine()))
-
-	runtimeMetrics.NumThread.Update(int64(threadCreateProfile.Count()))
-}
-
-// Register runtimeMetrics for the Go runtime statistics exported in runtime and
-// specifically runtime.MemStats.  The runtimeMetrics are named by their
-// fully-qualified Go symbols, i.e. runtime.MemStats.Alloc.
-func RegisterRuntimeMemStats(r Registry) {
-	runtimeMetrics.MemStats.Alloc = NewGauge()
-	runtimeMetrics.MemStats.BuckHashSys = NewGauge()
-	runtimeMetrics.MemStats.DebugGC = NewGauge()
-	runtimeMetrics.MemStats.EnableGC = NewGauge()
-	runtimeMetrics.MemStats.Frees = NewGauge()
-	runtimeMetrics.MemStats.HeapAlloc = NewGauge()
-	runtimeMetrics.MemStats.HeapIdle = NewGauge()
-	runtimeMetrics.MemStats.HeapInuse = NewGauge()
-	runtimeMetrics.MemStats.HeapObjects = NewGauge()
-	runtimeMetrics.MemStats.HeapReleased = NewGauge()
-	runtimeMetrics.MemStats.HeapSys = NewGauge()
-	runtimeMetrics.MemStats.LastGC = NewGauge()
-	runtimeMetrics.MemStats.Lookups = NewGauge()
-	runtimeMetrics.MemStats.Mallocs = NewGauge()
-	runtimeMetrics.MemStats.MCacheInuse = NewGauge()
-	runtimeMetrics.MemStats.MCacheSys = NewGauge()
-	runtimeMetrics.MemStats.MSpanInuse = NewGauge()
-	runtimeMetrics.MemStats.MSpanSys = NewGauge()
-	runtimeMetrics.MemStats.NextGC = NewGauge()
-	runtimeMetrics.MemStats.NumGC = NewGauge()
-	runtimeMetrics.MemStats.GCCPUFraction = NewGaugeFloat64()
-	runtimeMetrics.MemStats.PauseNs = NewHistogram(NewExpDecaySample(1028, 0.015))
-	runtimeMetrics.MemStats.PauseTotalNs = NewGauge()
-	runtimeMetrics.MemStats.StackInuse = NewGauge()
-	runtimeMetrics.MemStats.StackSys = NewGauge()
-	runtimeMetrics.MemStats.Sys = NewGauge()
-	runtimeMetrics.MemStats.TotalAlloc = NewGauge()
-	runtimeMetrics.NumCgoCall = NewGauge()
-	runtimeMetrics.NumGoroutine = NewGauge()
-	runtimeMetrics.NumThread = NewGauge()
-	runtimeMetrics.ReadMemStats = NewTimer()
-
-	r.Register("runtime.MemStats.Alloc", runtimeMetrics.MemStats.Alloc)
-	r.Register("runtime.MemStats.BuckHashSys", runtimeMetrics.MemStats.BuckHashSys)
-	r.Register("runtime.MemStats.DebugGC", runtimeMetrics.MemStats.DebugGC)
-	r.Register("runtime.MemStats.EnableGC", runtimeMetrics.MemStats.EnableGC)
-	r.Register("runtime.MemStats.Frees", runtimeMetrics.MemStats.Frees)
-	r.Register("runtime.MemStats.HeapAlloc", runtimeMetrics.MemStats.HeapAlloc)
-	r.Register("runtime.MemStats.HeapIdle", runtimeMetrics.MemStats.HeapIdle)
-	r.Register("runtime.MemStats.HeapInuse", runtimeMetrics.MemStats.HeapInuse)
-	r.Register("runtime.MemStats.HeapObjects", runtimeMetrics.MemStats.HeapObjects)
-	r.Register("runtime.MemStats.HeapReleased", runtimeMetrics.MemStats.HeapReleased)
-	r.Register("runtime.MemStats.HeapSys", runtimeMetrics.MemStats.HeapSys)
-	r.Register("runtime.MemStats.LastGC", runtimeMetrics.MemStats.LastGC)
-	r.Register("runtime.MemStats.Lookups", runtimeMetrics.MemStats.Lookups)
-	r.Register("runtime.MemStats.Mallocs", runtimeMetrics.MemStats.Mallocs)
-	r.Register("runtime.MemStats.MCacheInuse", runtimeMetrics.MemStats.MCacheInuse)
-	r.Register("runtime.MemStats.MCacheSys", runtimeMetrics.MemStats.MCacheSys)
-	r.Register("runtime.MemStats.MSpanInuse", runtimeMetrics.MemStats.MSpanInuse)
-	r.Register("runtime.MemStats.MSpanSys", runtimeMetrics.MemStats.MSpanSys)
-	r.Register("runtime.MemStats.NextGC", runtimeMetrics.MemStats.NextGC)
-	r.Register("runtime.MemStats.NumGC", runtimeMetrics.MemStats.NumGC)
-	r.Register("runtime.MemStats.GCCPUFraction", runtimeMetrics.MemStats.GCCPUFraction)
-	r.Register("runtime.MemStats.PauseNs", runtimeMetrics.MemStats.PauseNs)
-	r.Register("runtime.MemStats.PauseTotalNs", runtimeMetrics.MemStats.PauseTotalNs)
-	r.Register("runtime.MemStats.StackInuse", runtimeMetrics.MemStats.StackInuse)
-	r.Register("runtime.MemStats.StackSys", runtimeMetrics.MemStats.StackSys)
-	r.Register("runtime.MemStats.Sys", runtimeMetrics.MemStats.Sys)
-	r.Register("runtime.MemStats.TotalAlloc", runtimeMetrics.MemStats.TotalAlloc)
-	r.Register("runtime.NumCgoCall", runtimeMetrics.NumCgoCall)
-	r.Register("runtime.NumGoroutine", runtimeMetrics.NumGoroutine)
-	r.Register("runtime.NumThread", runtimeMetrics.NumThread)
-	r.Register("runtime.ReadMemStats", runtimeMetrics.ReadMemStats)
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/runtime_cgo.go b/vendor/github.com/rcrowley/go-metrics/runtime_cgo.go
deleted file mode 100644
index e3391f4e8..000000000
--- a/vendor/github.com/rcrowley/go-metrics/runtime_cgo.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// +build cgo
-// +build !appengine
-
-package metrics
-
-import "runtime"
-
-func numCgoCall() int64 {
-	return runtime.NumCgoCall()
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/runtime_gccpufraction.go b/vendor/github.com/rcrowley/go-metrics/runtime_gccpufraction.go
deleted file mode 100644
index ca12c05ba..000000000
--- a/vendor/github.com/rcrowley/go-metrics/runtime_gccpufraction.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// +build go1.5
-
-package metrics
-
-import "runtime"
-
-func gcCPUFraction(memStats *runtime.MemStats) float64 {
-	return memStats.GCCPUFraction
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/runtime_no_cgo.go b/vendor/github.com/rcrowley/go-metrics/runtime_no_cgo.go
deleted file mode 100644
index 616a3b475..000000000
--- a/vendor/github.com/rcrowley/go-metrics/runtime_no_cgo.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// +build !cgo appengine
-
-package metrics
-
-func numCgoCall() int64 {
-	return 0
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/runtime_no_gccpufraction.go b/vendor/github.com/rcrowley/go-metrics/runtime_no_gccpufraction.go
deleted file mode 100644
index be96aa6f1..000000000
--- a/vendor/github.com/rcrowley/go-metrics/runtime_no_gccpufraction.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// +build !go1.5
-
-package metrics
-
-import "runtime"
-
-func gcCPUFraction(memStats *runtime.MemStats) float64 {
-	return 0
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/sample.go b/vendor/github.com/rcrowley/go-metrics/sample.go
deleted file mode 100644
index fecee5ef6..000000000
--- a/vendor/github.com/rcrowley/go-metrics/sample.go
+++ /dev/null
@@ -1,616 +0,0 @@
-package metrics
-
-import (
-	"math"
-	"math/rand"
-	"sort"
-	"sync"
-	"time"
-)
-
-const rescaleThreshold = time.Hour
-
-// Samples maintain a statistically-significant selection of values from
-// a stream.
-type Sample interface {
-	Clear()
-	Count() int64
-	Max() int64
-	Mean() float64
-	Min() int64
-	Percentile(float64) float64
-	Percentiles([]float64) []float64
-	Size() int
-	Snapshot() Sample
-	StdDev() float64
-	Sum() int64
-	Update(int64)
-	Values() []int64
-	Variance() float64
-}
-
-// ExpDecaySample is an exponentially-decaying sample using a forward-decaying
-// priority reservoir.  See Cormode et al's "Forward Decay: A Practical Time
-// Decay Model for Streaming Systems".
-//
-// <http://dimacs.rutgers.edu/~graham/pubs/papers/fwddecay.pdf>
-type ExpDecaySample struct {
-	alpha         float64
-	count         int64
-	mutex         sync.Mutex
-	reservoirSize int
-	t0, t1        time.Time
-	values        *expDecaySampleHeap
-}
-
-// NewExpDecaySample constructs a new exponentially-decaying sample with the
-// given reservoir size and alpha.
-func NewExpDecaySample(reservoirSize int, alpha float64) Sample {
-	if UseNilMetrics {
-		return NilSample{}
-	}
-	s := &ExpDecaySample{
-		alpha:         alpha,
-		reservoirSize: reservoirSize,
-		t0:            time.Now(),
-		values:        newExpDecaySampleHeap(reservoirSize),
-	}
-	s.t1 = s.t0.Add(rescaleThreshold)
-	return s
-}
-
-// Clear clears all samples.
-func (s *ExpDecaySample) Clear() {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	s.count = 0
-	s.t0 = time.Now()
-	s.t1 = s.t0.Add(rescaleThreshold)
-	s.values.Clear()
-}
-
-// Count returns the number of samples recorded, which may exceed the
-// reservoir size.
-func (s *ExpDecaySample) Count() int64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return s.count
-}
-
-// Max returns the maximum value in the sample, which may not be the maximum
-// value ever to be part of the sample.
-func (s *ExpDecaySample) Max() int64 {
-	return SampleMax(s.Values())
-}
-
-// Mean returns the mean of the values in the sample.
-func (s *ExpDecaySample) Mean() float64 {
-	return SampleMean(s.Values())
-}
-
-// Min returns the minimum value in the sample, which may not be the minimum
-// value ever to be part of the sample.
-func (s *ExpDecaySample) Min() int64 {
-	return SampleMin(s.Values())
-}
-
-// Percentile returns an arbitrary percentile of values in the sample.
-func (s *ExpDecaySample) Percentile(p float64) float64 {
-	return SamplePercentile(s.Values(), p)
-}
-
-// Percentiles returns a slice of arbitrary percentiles of values in the
-// sample.
-func (s *ExpDecaySample) Percentiles(ps []float64) []float64 {
-	return SamplePercentiles(s.Values(), ps)
-}
-
-// Size returns the size of the sample, which is at most the reservoir size.
-func (s *ExpDecaySample) Size() int {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return s.values.Size()
-}
-
-// Snapshot returns a read-only copy of the sample.
-func (s *ExpDecaySample) Snapshot() Sample {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	vals := s.values.Values()
-	values := make([]int64, len(vals))
-	for i, v := range vals {
-		values[i] = v.v
-	}
-	return &SampleSnapshot{
-		count:  s.count,
-		values: values,
-	}
-}
-
-// StdDev returns the standard deviation of the values in the sample.
-func (s *ExpDecaySample) StdDev() float64 {
-	return SampleStdDev(s.Values())
-}
-
-// Sum returns the sum of the values in the sample.
-func (s *ExpDecaySample) Sum() int64 {
-	return SampleSum(s.Values())
-}
-
-// Update samples a new value.
-func (s *ExpDecaySample) Update(v int64) {
-	s.update(time.Now(), v)
-}
-
-// Values returns a copy of the values in the sample.
-func (s *ExpDecaySample) Values() []int64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	vals := s.values.Values()
-	values := make([]int64, len(vals))
-	for i, v := range vals {
-		values[i] = v.v
-	}
-	return values
-}
-
-// Variance returns the variance of the values in the sample.
-func (s *ExpDecaySample) Variance() float64 {
-	return SampleVariance(s.Values())
-}
-
-// update samples a new value at a particular timestamp.  This is a method all
-// its own to facilitate testing.
-func (s *ExpDecaySample) update(t time.Time, v int64) {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	s.count++
-	if s.values.Size() == s.reservoirSize {
-		s.values.Pop()
-	}
-	s.values.Push(expDecaySample{
-		k: math.Exp(t.Sub(s.t0).Seconds()*s.alpha) / rand.Float64(),
-		v: v,
-	})
-	if t.After(s.t1) {
-		values := s.values.Values()
-		t0 := s.t0
-		s.values.Clear()
-		s.t0 = t
-		s.t1 = s.t0.Add(rescaleThreshold)
-		for _, v := range values {
-			v.k = v.k * math.Exp(-s.alpha*s.t0.Sub(t0).Seconds())
-			s.values.Push(v)
-		}
-	}
-}
-
-// NilSample is a no-op Sample.
-type NilSample struct{}
-
-// Clear is a no-op.
-func (NilSample) Clear() {}
-
-// Count is a no-op.
-func (NilSample) Count() int64 { return 0 }
-
-// Max is a no-op.
-func (NilSample) Max() int64 { return 0 }
-
-// Mean is a no-op.
-func (NilSample) Mean() float64 { return 0.0 }
-
-// Min is a no-op.
-func (NilSample) Min() int64 { return 0 }
-
-// Percentile is a no-op.
-func (NilSample) Percentile(p float64) float64 { return 0.0 }
-
-// Percentiles is a no-op.
-func (NilSample) Percentiles(ps []float64) []float64 {
-	return make([]float64, len(ps))
-}
-
-// Size is a no-op.
-func (NilSample) Size() int { return 0 }
-
-// Sample is a no-op.
-func (NilSample) Snapshot() Sample { return NilSample{} }
-
-// StdDev is a no-op.
-func (NilSample) StdDev() float64 { return 0.0 }
-
-// Sum is a no-op.
-func (NilSample) Sum() int64 { return 0 }
-
-// Update is a no-op.
-func (NilSample) Update(v int64) {}
-
-// Values is a no-op.
-func (NilSample) Values() []int64 { return []int64{} }
-
-// Variance is a no-op.
-func (NilSample) Variance() float64 { return 0.0 }
-
-// SampleMax returns the maximum value of the slice of int64.
-func SampleMax(values []int64) int64 {
-	if 0 == len(values) {
-		return 0
-	}
-	var max int64 = math.MinInt64
-	for _, v := range values {
-		if max < v {
-			max = v
-		}
-	}
-	return max
-}
-
-// SampleMean returns the mean value of the slice of int64.
-func SampleMean(values []int64) float64 {
-	if 0 == len(values) {
-		return 0.0
-	}
-	return float64(SampleSum(values)) / float64(len(values))
-}
-
-// SampleMin returns the minimum value of the slice of int64.
-func SampleMin(values []int64) int64 {
-	if 0 == len(values) {
-		return 0
-	}
-	var min int64 = math.MaxInt64
-	for _, v := range values {
-		if min > v {
-			min = v
-		}
-	}
-	return min
-}
-
-// SamplePercentiles returns an arbitrary percentile of the slice of int64.
-func SamplePercentile(values int64Slice, p float64) float64 {
-	return SamplePercentiles(values, []float64{p})[0]
-}
-
-// SamplePercentiles returns a slice of arbitrary percentiles of the slice of
-// int64.
-func SamplePercentiles(values int64Slice, ps []float64) []float64 {
-	scores := make([]float64, len(ps))
-	size := len(values)
-	if size > 0 {
-		sort.Sort(values)
-		for i, p := range ps {
-			pos := p * float64(size+1)
-			if pos < 1.0 {
-				scores[i] = float64(values[0])
-			} else if pos >= float64(size) {
-				scores[i] = float64(values[size-1])
-			} else {
-				lower := float64(values[int(pos)-1])
-				upper := float64(values[int(pos)])
-				scores[i] = lower + (pos-math.Floor(pos))*(upper-lower)
-			}
-		}
-	}
-	return scores
-}
-
-// SampleSnapshot is a read-only copy of another Sample.
-type SampleSnapshot struct {
-	count  int64
-	values []int64
-}
-
-func NewSampleSnapshot(count int64, values []int64) *SampleSnapshot {
-	return &SampleSnapshot{
-		count:  count,
-		values: values,
-	}
-}
-
-// Clear panics.
-func (*SampleSnapshot) Clear() {
-	panic("Clear called on a SampleSnapshot")
-}
-
-// Count returns the count of inputs at the time the snapshot was taken.
-func (s *SampleSnapshot) Count() int64 { return s.count }
-
-// Max returns the maximal value at the time the snapshot was taken.
-func (s *SampleSnapshot) Max() int64 { return SampleMax(s.values) }
-
-// Mean returns the mean value at the time the snapshot was taken.
-func (s *SampleSnapshot) Mean() float64 { return SampleMean(s.values) }
-
-// Min returns the minimal value at the time the snapshot was taken.
-func (s *SampleSnapshot) Min() int64 { return SampleMin(s.values) }
-
-// Percentile returns an arbitrary percentile of values at the time the
-// snapshot was taken.
-func (s *SampleSnapshot) Percentile(p float64) float64 {
-	return SamplePercentile(s.values, p)
-}
-
-// Percentiles returns a slice of arbitrary percentiles of values at the time
-// the snapshot was taken.
-func (s *SampleSnapshot) Percentiles(ps []float64) []float64 {
-	return SamplePercentiles(s.values, ps)
-}
-
-// Size returns the size of the sample at the time the snapshot was taken.
-func (s *SampleSnapshot) Size() int { return len(s.values) }
-
-// Snapshot returns the snapshot.
-func (s *SampleSnapshot) Snapshot() Sample { return s }
-
-// StdDev returns the standard deviation of values at the time the snapshot was
-// taken.
-func (s *SampleSnapshot) StdDev() float64 { return SampleStdDev(s.values) }
-
-// Sum returns the sum of values at the time the snapshot was taken.
-func (s *SampleSnapshot) Sum() int64 { return SampleSum(s.values) }
-
-// Update panics.
-func (*SampleSnapshot) Update(int64) {
-	panic("Update called on a SampleSnapshot")
-}
-
-// Values returns a copy of the values in the sample.
-func (s *SampleSnapshot) Values() []int64 {
-	values := make([]int64, len(s.values))
-	copy(values, s.values)
-	return values
-}
-
-// Variance returns the variance of values at the time the snapshot was taken.
-func (s *SampleSnapshot) Variance() float64 { return SampleVariance(s.values) }
-
-// SampleStdDev returns the standard deviation of the slice of int64.
-func SampleStdDev(values []int64) float64 {
-	return math.Sqrt(SampleVariance(values))
-}
-
-// SampleSum returns the sum of the slice of int64.
-func SampleSum(values []int64) int64 {
-	var sum int64
-	for _, v := range values {
-		sum += v
-	}
-	return sum
-}
-
-// SampleVariance returns the variance of the slice of int64.
-func SampleVariance(values []int64) float64 {
-	if 0 == len(values) {
-		return 0.0
-	}
-	m := SampleMean(values)
-	var sum float64
-	for _, v := range values {
-		d := float64(v) - m
-		sum += d * d
-	}
-	return sum / float64(len(values))
-}
-
-// A uniform sample using Vitter's Algorithm R.
-//
-// <http://www.cs.umd.edu/~samir/498/vitter.pdf>
-type UniformSample struct {
-	count         int64
-	mutex         sync.Mutex
-	reservoirSize int
-	values        []int64
-}
-
-// NewUniformSample constructs a new uniform sample with the given reservoir
-// size.
-func NewUniformSample(reservoirSize int) Sample {
-	if UseNilMetrics {
-		return NilSample{}
-	}
-	return &UniformSample{
-		reservoirSize: reservoirSize,
-		values:        make([]int64, 0, reservoirSize),
-	}
-}
-
-// Clear clears all samples.
-func (s *UniformSample) Clear() {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	s.count = 0
-	s.values = make([]int64, 0, s.reservoirSize)
-}
-
-// Count returns the number of samples recorded, which may exceed the
-// reservoir size.
-func (s *UniformSample) Count() int64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return s.count
-}
-
-// Max returns the maximum value in the sample, which may not be the maximum
-// value ever to be part of the sample.
-func (s *UniformSample) Max() int64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SampleMax(s.values)
-}
-
-// Mean returns the mean of the values in the sample.
-func (s *UniformSample) Mean() float64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SampleMean(s.values)
-}
-
-// Min returns the minimum value in the sample, which may not be the minimum
-// value ever to be part of the sample.
-func (s *UniformSample) Min() int64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SampleMin(s.values)
-}
-
-// Percentile returns an arbitrary percentile of values in the sample.
-func (s *UniformSample) Percentile(p float64) float64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SamplePercentile(s.values, p)
-}
-
-// Percentiles returns a slice of arbitrary percentiles of values in the
-// sample.
-func (s *UniformSample) Percentiles(ps []float64) []float64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SamplePercentiles(s.values, ps)
-}
-
-// Size returns the size of the sample, which is at most the reservoir size.
-func (s *UniformSample) Size() int {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return len(s.values)
-}
-
-// Snapshot returns a read-only copy of the sample.
-func (s *UniformSample) Snapshot() Sample {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	values := make([]int64, len(s.values))
-	copy(values, s.values)
-	return &SampleSnapshot{
-		count:  s.count,
-		values: values,
-	}
-}
-
-// StdDev returns the standard deviation of the values in the sample.
-func (s *UniformSample) StdDev() float64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SampleStdDev(s.values)
-}
-
-// Sum returns the sum of the values in the sample.
-func (s *UniformSample) Sum() int64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SampleSum(s.values)
-}
-
-// Update samples a new value.
-func (s *UniformSample) Update(v int64) {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	s.count++
-	if len(s.values) < s.reservoirSize {
-		s.values = append(s.values, v)
-	} else {
-		r := rand.Int63n(s.count)
-		if r < int64(len(s.values)) {
-			s.values[int(r)] = v
-		}
-	}
-}
-
-// Values returns a copy of the values in the sample.
-func (s *UniformSample) Values() []int64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	values := make([]int64, len(s.values))
-	copy(values, s.values)
-	return values
-}
-
-// Variance returns the variance of the values in the sample.
-func (s *UniformSample) Variance() float64 {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
-	return SampleVariance(s.values)
-}
-
-// expDecaySample represents an individual sample in a heap.
-type expDecaySample struct {
-	k float64
-	v int64
-}
-
-func newExpDecaySampleHeap(reservoirSize int) *expDecaySampleHeap {
-	return &expDecaySampleHeap{make([]expDecaySample, 0, reservoirSize)}
-}
-
-// expDecaySampleHeap is a min-heap of expDecaySamples.
-// The internal implementation is copied from the standard library's container/heap
-type expDecaySampleHeap struct {
-	s []expDecaySample
-}
-
-func (h *expDecaySampleHeap) Clear() {
-	h.s = h.s[:0]
-}
-
-func (h *expDecaySampleHeap) Push(s expDecaySample) {
-	n := len(h.s)
-	h.s = h.s[0 : n+1]
-	h.s[n] = s
-	h.up(n)
-}
-
-func (h *expDecaySampleHeap) Pop() expDecaySample {
-	n := len(h.s) - 1
-	h.s[0], h.s[n] = h.s[n], h.s[0]
-	h.down(0, n)
-
-	n = len(h.s)
-	s := h.s[n-1]
-	h.s = h.s[0 : n-1]
-	return s
-}
-
-func (h *expDecaySampleHeap) Size() int {
-	return len(h.s)
-}
-
-func (h *expDecaySampleHeap) Values() []expDecaySample {
-	return h.s
-}
-
-func (h *expDecaySampleHeap) up(j int) {
-	for {
-		i := (j - 1) / 2 // parent
-		if i == j || !(h.s[j].k < h.s[i].k) {
-			break
-		}
-		h.s[i], h.s[j] = h.s[j], h.s[i]
-		j = i
-	}
-}
-
-func (h *expDecaySampleHeap) down(i, n int) {
-	for {
-		j1 := 2*i + 1
-		if j1 >= n || j1 < 0 { // j1 < 0 after int overflow
-			break
-		}
-		j := j1 // left child
-		if j2 := j1 + 1; j2 < n && !(h.s[j1].k < h.s[j2].k) {
-			j = j2 // = 2*i + 2  // right child
-		}
-		if !(h.s[j].k < h.s[i].k) {
-			break
-		}
-		h.s[i], h.s[j] = h.s[j], h.s[i]
-		i = j
-	}
-}
-
-type int64Slice []int64
-
-func (p int64Slice) Len() int           { return len(p) }
-func (p int64Slice) Less(i, j int) bool { return p[i] < p[j] }
-func (p int64Slice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
diff --git a/vendor/github.com/rcrowley/go-metrics/syslog.go b/vendor/github.com/rcrowley/go-metrics/syslog.go
deleted file mode 100644
index 693f19085..000000000
--- a/vendor/github.com/rcrowley/go-metrics/syslog.go
+++ /dev/null
@@ -1,78 +0,0 @@
-// +build !windows
-
-package metrics
-
-import (
-	"fmt"
-	"log/syslog"
-	"time"
-)
-
-// Output each metric in the given registry to syslog periodically using
-// the given syslogger.
-func Syslog(r Registry, d time.Duration, w *syslog.Writer) {
-	for _ = range time.Tick(d) {
-		r.Each(func(name string, i interface{}) {
-			switch metric := i.(type) {
-			case Counter:
-				w.Info(fmt.Sprintf("counter %s: count: %d", name, metric.Count()))
-			case Gauge:
-				w.Info(fmt.Sprintf("gauge %s: value: %d", name, metric.Value()))
-			case GaugeFloat64:
-				w.Info(fmt.Sprintf("gauge %s: value: %f", name, metric.Value()))
-			case Healthcheck:
-				metric.Check()
-				w.Info(fmt.Sprintf("healthcheck %s: error: %v", name, metric.Error()))
-			case Histogram:
-				h := metric.Snapshot()
-				ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-				w.Info(fmt.Sprintf(
-					"histogram %s: count: %d min: %d max: %d mean: %.2f stddev: %.2f median: %.2f 75%%: %.2f 95%%: %.2f 99%%: %.2f 99.9%%: %.2f",
-					name,
-					h.Count(),
-					h.Min(),
-					h.Max(),
-					h.Mean(),
-					h.StdDev(),
-					ps[0],
-					ps[1],
-					ps[2],
-					ps[3],
-					ps[4],
-				))
-			case Meter:
-				m := metric.Snapshot()
-				w.Info(fmt.Sprintf(
-					"meter %s: count: %d 1-min: %.2f 5-min: %.2f 15-min: %.2f mean: %.2f",
-					name,
-					m.Count(),
-					m.Rate1(),
-					m.Rate5(),
-					m.Rate15(),
-					m.RateMean(),
-				))
-			case Timer:
-				t := metric.Snapshot()
-				ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-				w.Info(fmt.Sprintf(
-					"timer %s: count: %d min: %d max: %d mean: %.2f stddev: %.2f median: %.2f 75%%: %.2f 95%%: %.2f 99%%: %.2f 99.9%%: %.2f 1-min: %.2f 5-min: %.2f 15-min: %.2f mean-rate: %.2f",
-					name,
-					t.Count(),
-					t.Min(),
-					t.Max(),
-					t.Mean(),
-					t.StdDev(),
-					ps[0],
-					ps[1],
-					ps[2],
-					ps[3],
-					ps[4],
-					t.Rate1(),
-					t.Rate5(),
-					t.Rate15(),
-					t.RateMean(),
-				))
-			}
-		})
-	}
-}
diff --git a/vendor/github.com/rcrowley/go-metrics/timer.go b/vendor/github.com/rcrowley/go-metrics/timer.go
deleted file mode 100644
index 17db8f8d2..000000000
--- a/vendor/github.com/rcrowley/go-metrics/timer.go
+++ /dev/null
@@ -1,311 +0,0 @@
-package metrics
-
-import (
-	"sync"
-	"time"
-)
-
-// Timers capture the duration and rate of events.
-type Timer interface {
-	Count() int64
-	Max() int64
-	Mean() float64
-	Min() int64
-	Percentile(float64) float64
-	Percentiles([]float64) []float64
-	Rate1() float64
-	Rate5() float64
-	Rate15() float64
-	RateMean() float64
-	Snapshot() Timer
-	StdDev() float64
-	Sum() int64
-	Time(func())
-	Update(time.Duration)
-	UpdateSince(time.Time)
-	Variance() float64
-}
-
-// GetOrRegisterTimer returns an existing Timer or constructs and registers a
-// new StandardTimer.
-func GetOrRegisterTimer(name string, r Registry) Timer {
-	if nil == r {
-		r = DefaultRegistry
-	}
-	return r.GetOrRegister(name, NewTimer).(Timer)
-}
-
-// NewCustomTimer constructs a new StandardTimer from a Histogram and a Meter.
-func NewCustomTimer(h Histogram, m Meter) Timer {
-	if UseNilMetrics {
-		return NilTimer{}
-	}
-	return &StandardTimer{
-		histogram: h,
-		meter:     m,
-	}
-}
-
-// NewRegisteredTimer constructs and registers a new StandardTimer.
-func NewRegisteredTimer(name string, r Registry) Timer {
-	c := NewTimer()
-	if nil == r {
-		r = DefaultRegistry
-	}
-	r.Register(name, c)
-	return c
-}
-
-// NewTimer constructs a new StandardTimer using an exponentially-decaying
-// sample with the same reservoir size and alpha as UNIX load averages.
-func NewTimer() Timer {
-	if UseNilMetrics {
-		return NilTimer{}
-	}
-	return &StandardTimer{
-		histogram: NewHistogram(NewExpDecaySample(1028, 0.015)),
-		meter:     NewMeter(),
-	}
-}
-
-// NilTimer is a no-op Timer.
-type NilTimer struct {
-	h Histogram
-	m Meter
-}
-
-// Count is a no-op.
-func (NilTimer) Count() int64 { return 0 }
-
-// Max is a no-op.
-func (NilTimer) Max() int64 { return 0 }
-
-// Mean is a no-op.
-func (NilTimer) Mean() float64 { return 0.0 }
-
-// Min is a no-op.
-func (NilTimer) Min() int64 { return 0 }
-
-// Percentile is a no-op.
-func (NilTimer) Percentile(p float64) float64 { return 0.0 }
-
-// Percentiles is a no-op.
-func (NilTimer) Percentiles(ps []float64) []float64 {
-	return make([]float64, len(ps))
-}
-
-// Rate1 is a no-op.
-func (NilTimer) Rate1() float64 { return 0.0 }
-
-// Rate5 is a no-op.
-func (NilTimer) Rate5() float64 { return 0.0 }
-
-// Rate15 is a no-op.
-func (NilTimer) Rate15() float64 { return 0.0 }
-
-// RateMean is a no-op.
-func (NilTimer) RateMean() float64 { return 0.0 }
-
-// Snapshot is a no-op.
-func (NilTimer) Snapshot() Timer { return NilTimer{} }
-
-// StdDev is a no-op.
-func (NilTimer) StdDev() float64 { return 0.0 }
-
-// Sum is a no-op.
-func (NilTimer) Sum() int64 { return 0 }
-
-// Time is a no-op.
-func (NilTimer) Time(func()) {}
-
-// Update is a no-op.
-func (NilTimer) Update(time.Duration) {}
-
-// UpdateSince is a no-op.
-func (NilTimer) UpdateSince(time.Time) {}
-
-// Variance is a no-op.
-func (NilTimer) Variance() float64 { return 0.0 }
-
-// StandardTimer is the standard implementation of a Timer and uses a Histogram
-// and Meter.
-type StandardTimer struct {
-	histogram Histogram
-	meter     Meter
-	mutex     sync.Mutex
-}
-
-// Count returns the number of events recorded.
-func (t *StandardTimer) Count() int64 {
-	return t.histogram.Count()
-}
-
-// Max returns the maximum value in the sample.
-func (t *StandardTimer) Max() int64 {
-	return t.histogram.Max()
-}
-
-// Mean returns the mean of the values in the sample.
-func (t *StandardTimer) Mean() float64 {
-	return t.histogram.Mean()
-}
-
-// Min returns the minimum value in the sample.
-func (t *StandardTimer) Min() int64 {
-	return t.histogram.Min()
-}
-
-// Percentile returns an arbitrary percentile of the values in the sample.
-func (t *StandardTimer) Percentile(p float64) float64 {
-	return t.histogram.Percentile(p)
-}
-
-// Percentiles returns a slice of arbitrary percentiles of the values in the
-// sample.
-func (t *StandardTimer) Percentiles(ps []float64) []float64 {
-	return t.histogram.Percentiles(ps)
-}
-
-// Rate1 returns the one-minute moving average rate of events per second.
-func (t *StandardTimer) Rate1() float64 {
-	return t.meter.Rate1()
-}
-
-// Rate5 returns the five-minute moving average rate of events per second.
-func (t *StandardTimer) Rate5() float64 {
-	return t.meter.Rate5()
-}
-
-// Rate15 returns the fifteen-minute moving average rate of events per second.
-func (t *StandardTimer) Rate15() float64 {
-	return t.meter.Rate15()
-}
-
-// RateMean returns the meter's mean rate of events per second.
-func (t *StandardTimer) RateMean() float64 {
-	return t.meter.RateMean()
-}
-
-// Snapshot returns a read-only copy of the timer.
-func (t *StandardTimer) Snapshot() Timer {
-	t.mutex.Lock()
-	defer t.mutex.Unlock()
-	return &TimerSnapshot{
-		histogram: t.histogram.Snapshot().(*HistogramSnapshot),
-		meter:     t.meter.Snapshot().(*MeterSnapshot),
-	}
-}
-
-// StdDev returns the standard deviation of the values in the sample.
-func (t *StandardTimer) StdDev() float64 {
-	return t.histogram.StdDev()
-}
-
-// Sum returns the sum in the sample.
-func (t *StandardTimer) Sum() int64 {
-	return t.histogram.Sum()
-}
-
-// Record the duration of the execution of the given function.
-func (t *StandardTimer) Time(f func()) {
-	ts := time.Now()
-	f()
-	t.Update(time.Since(ts))
-}
-
-// Record the duration of an event.
-func (t *StandardTimer) Update(d time.Duration) {
-	t.mutex.Lock()
-	defer t.mutex.Unlock()
-	t.histogram.Update(int64(d))
-	t.meter.Mark(1)
-}
-
-// Record the duration of an event that started at a time and ends now.
-func (t *StandardTimer) UpdateSince(ts time.Time) {
-	t.mutex.Lock()
-	defer t.mutex.Unlock()
-	t.histogram.Update(int64(time.Since(ts)))
-	t.meter.Mark(1)
-}
-
-// Variance returns the variance of the values in the sample.
-func (t *StandardTimer) Variance() float64 {
-	return t.histogram.Variance()
-}
-
-// TimerSnapshot is a read-only copy of another Timer.
-type TimerSnapshot struct {
-	histogram *HistogramSnapshot
-	meter     *MeterSnapshot
-}
-
-// Count returns the number of events recorded at the time the snapshot was
-// taken.
-func (t *TimerSnapshot) Count() int64 { return t.histogram.Count() }
-
-// Max returns the maximum value at the time the snapshot was taken.
-func (t *TimerSnapshot) Max() int64 { return t.histogram.Max() }
-
-// Mean returns the mean value at the time the snapshot was taken.
-func (t *TimerSnapshot) Mean() float64 { return t.histogram.Mean() }
-
-// Min returns the minimum value at the time the snapshot was taken.
-func (t *TimerSnapshot) Min() int64 { return t.histogram.Min() }
-
-// Percentile returns an arbitrary percentile of sampled values at the time the
-// snapshot was taken.
-func (t *TimerSnapshot) Percentile(p float64) float64 {
-	return t.histogram.Percentile(p)
-}
-
-// Percentiles returns a slice of arbitrary percentiles of sampled values at
-// the time the snapshot was taken.
-func (t *TimerSnapshot) Percentiles(ps []float64) []float64 {
-	return t.histogram.Percentiles(ps)
-}
-
-// Rate1 returns the one-minute moving average rate of events per second at the
-// time the snapshot was taken.
-func (t *TimerSnapshot) Rate1() float64 { return t.meter.Rate1() }
-
-// Rate5 returns the five-minute moving average rate of events per second at
-// the time the snapshot was taken.
-func (t *TimerSnapshot) Rate5() float64 { return t.meter.Rate5() }
-
-// Rate15 returns the fifteen-minute moving average rate of events per second
-// at the time the snapshot was taken.
-func (t *TimerSnapshot) Rate15() float64 { return t.meter.Rate15() }
-
-// RateMean returns the meter's mean rate of events per second at the time the
-// snapshot was taken.
-func (t *TimerSnapshot) RateMean() float64 { return t.meter.RateMean() }
-
-// Snapshot returns the snapshot.
-func (t *TimerSnapshot) Snapshot() Timer { return t }
-
-// StdDev returns the standard deviation of the values at the time the snapshot
-// was taken.
-func (t *TimerSnapshot) StdDev() float64 { return t.histogram.StdDev() }
-
-// Sum returns the sum at the time the snapshot was taken.
-func (t *TimerSnapshot) Sum() int64 { return t.histogram.Sum() }
-
-// Time panics.
-func (*TimerSnapshot) Time(func()) {
-	panic("Time called on a TimerSnapshot")
-}
-
-// Update panics.
-func (*TimerSnapshot) Update(time.Duration) {
-	panic("Update called on a TimerSnapshot")
-}
-
-// UpdateSince panics.
-func (*TimerSnapshot) UpdateSince(time.Time) {
-	panic("UpdateSince called on a TimerSnapshot")
-}
-
-// Variance returns the variance of the values at the time the snapshot was
-// taken.
-func (t *TimerSnapshot) Variance() float64 { return t.histogram.Variance() }
diff --git a/vendor/github.com/rcrowley/go-metrics/validate.sh b/vendor/github.com/rcrowley/go-metrics/validate.sh
deleted file mode 100755
index f6499982e..000000000
--- a/vendor/github.com/rcrowley/go-metrics/validate.sh
+++ /dev/null
@@ -1,10 +0,0 @@
-#!/bin/bash
-
-set -e
-
-# check there are no formatting issues
-GOFMT_LINES=`gofmt -l . | wc -l | xargs`
-test $GOFMT_LINES -eq 0 || echo "gofmt needs to be run, ${GOFMT_LINES} files have issues"
-
-# run the tests for the root package
-go test .
diff --git a/vendor/github.com/rcrowley/go-metrics/writer.go b/vendor/github.com/rcrowley/go-metrics/writer.go
deleted file mode 100644
index 091e971d2..000000000
--- a/vendor/github.com/rcrowley/go-metrics/writer.go
+++ /dev/null
@@ -1,100 +0,0 @@
-package metrics
-
-import (
-	"fmt"
-	"io"
-	"sort"
-	"time"
-)
-
-// Write sorts writes each metric in the given registry periodically to the
-// given io.Writer.
-func Write(r Registry, d time.Duration, w io.Writer) {
-	for _ = range time.Tick(d) {
-		WriteOnce(r, w)
-	}
-}
-
-// WriteOnce sorts and writes metrics in the given registry to the given
-// io.Writer.
-func WriteOnce(r Registry, w io.Writer) {
-	var namedMetrics namedMetricSlice
-	r.Each(func(name string, i interface{}) {
-		namedMetrics = append(namedMetrics, namedMetric{name, i})
-	})
-
-	sort.Sort(namedMetrics)
-	for _, namedMetric := range namedMetrics {
-		switch metric := namedMetric.m.(type) {
-		case Counter:
-			fmt.Fprintf(w, "counter %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", metric.Count())
-		case Gauge:
-			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  value:       %9d\n", metric.Value())
-		case GaugeFloat64:
-			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  value:       %f\n", metric.Value())
-		case Healthcheck:
-			metric.Check()
-			fmt.Fprintf(w, "healthcheck %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  error:       %v\n", metric.Error())
-		case Histogram:
-			h := metric.Snapshot()
-			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			fmt.Fprintf(w, "histogram %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", h.Count())
-			fmt.Fprintf(w, "  min:         %9d\n", h.Min())
-			fmt.Fprintf(w, "  max:         %9d\n", h.Max())
-			fmt.Fprintf(w, "  mean:        %12.2f\n", h.Mean())
-			fmt.Fprintf(w, "  stddev:      %12.2f\n", h.StdDev())
-			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
-			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
-			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
-			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
-			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
-		case Meter:
-			m := metric.Snapshot()
-			fmt.Fprintf(w, "meter %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", m.Count())
-			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", m.Rate1())
-			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", m.Rate5())
-			fmt.Fprintf(w, "  15-min rate: %12.2f\n", m.Rate15())
-			fmt.Fprintf(w, "  mean rate:   %12.2f\n", m.RateMean())
-		case Timer:
-			t := metric.Snapshot()
-			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			fmt.Fprintf(w, "timer %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", t.Count())
-			fmt.Fprintf(w, "  min:         %9d\n", t.Min())
-			fmt.Fprintf(w, "  max:         %9d\n", t.Max())
-			fmt.Fprintf(w, "  mean:        %12.2f\n", t.Mean())
-			fmt.Fprintf(w, "  stddev:      %12.2f\n", t.StdDev())
-			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
-			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
-			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
-			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
-			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
-			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", t.Rate1())
-			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", t.Rate5())
-			fmt.Fprintf(w, "  15-min rate: %12.2f\n", t.Rate15())
-			fmt.Fprintf(w, "  mean rate:   %12.2f\n", t.RateMean())
-		}
-	}
-}
-
-type namedMetric struct {
-	name string
-	m    interface{}
-}
-
-// namedMetricSlice is a slice of namedMetrics that implements sort.Interface.
-type namedMetricSlice []namedMetric
-
-func (nms namedMetricSlice) Len() int { return len(nms) }
-
-func (nms namedMetricSlice) Swap(i, j int) { nms[i], nms[j] = nms[j], nms[i] }
-
-func (nms namedMetricSlice) Less(i, j int) bool {
-	return nms[i].name < nms[j].name
-}