167 lines
4.4 KiB
Markdown
167 lines
4.4 KiB
Markdown
go-metrics
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==========
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Go port of Coda Hale's Metrics library: <https://github.com/dropwizard/metrics>.
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Documentation: <https://godoc.org/github.com/rcrowley/go-metrics>.
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Usage
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-----
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Create and update metrics:
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```go
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c := metrics.NewCounter()
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metrics.Register("foo", c)
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c.Inc(47)
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g := metrics.NewGauge()
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metrics.Register("bar", g)
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g.Update(47)
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r := NewRegistry()
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g := metrics.NewRegisteredFunctionalGauge("cache-evictions", r, func() int64 { return cache.getEvictionsCount() })
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s := metrics.NewExpDecaySample(1028, 0.015) // or metrics.NewUniformSample(1028)
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h := metrics.NewHistogram(s)
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metrics.Register("baz", h)
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h.Update(47)
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m := metrics.NewMeter()
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metrics.Register("quux", m)
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m.Mark(47)
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t := metrics.NewTimer()
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metrics.Register("bang", t)
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t.Time(func() {})
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t.Update(47)
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```
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Register() is not threadsafe. For threadsafe metric registration use
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GetOrRegister:
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```go
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t := metrics.GetOrRegisterTimer("account.create.latency", nil)
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t.Time(func() {})
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t.Update(47)
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```
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**NOTE:** Be sure to unregister short-lived meters and timers otherwise they will
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leak memory:
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```go
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// Will call Stop() on the Meter to allow for garbage collection
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metrics.Unregister("quux")
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// Or similarly for a Timer that embeds a Meter
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metrics.Unregister("bang")
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```
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Periodically log every metric in human-readable form to standard error:
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```go
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go metrics.Log(metrics.DefaultRegistry, 5 * time.Second, log.New(os.Stderr, "metrics: ", log.Lmicroseconds))
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```
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Periodically log every metric in slightly-more-parseable form to syslog:
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```go
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w, _ := syslog.Dial("unixgram", "/dev/log", syslog.LOG_INFO, "metrics")
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go metrics.Syslog(metrics.DefaultRegistry, 60e9, w)
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```
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Periodically emit every metric to Graphite using the [Graphite client](https://github.com/cyberdelia/go-metrics-graphite):
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```go
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import "github.com/cyberdelia/go-metrics-graphite"
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addr, _ := net.ResolveTCPAddr("tcp", "127.0.0.1:2003")
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go graphite.Graphite(metrics.DefaultRegistry, 10e9, "metrics", addr)
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```
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Periodically emit every metric into InfluxDB:
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**NOTE:** this has been pulled out of the library due to constant fluctuations
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in the InfluxDB API. In fact, all client libraries are on their way out. see
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issues [#121](https://github.com/rcrowley/go-metrics/issues/121) and
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[#124](https://github.com/rcrowley/go-metrics/issues/124) for progress and details.
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```go
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import "github.com/vrischmann/go-metrics-influxdb"
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go influxdb.InfluxDB(metrics.DefaultRegistry,
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10e9,
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"127.0.0.1:8086",
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"database-name",
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"username",
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"password"
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)
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```
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Periodically upload every metric to Librato using the [Librato client](https://github.com/mihasya/go-metrics-librato):
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**Note**: the client included with this repository under the `librato` package
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has been deprecated and moved to the repository linked above.
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```go
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import "github.com/mihasya/go-metrics-librato"
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go librato.Librato(metrics.DefaultRegistry,
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10e9, // interval
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"example@example.com", // account owner email address
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"token", // Librato API token
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"hostname", // source
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[]float64{0.95}, // percentiles to send
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time.Millisecond, // time unit
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)
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```
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Periodically emit every metric to StatHat:
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```go
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import "github.com/rcrowley/go-metrics/stathat"
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go stathat.Stathat(metrics.DefaultRegistry, 10e9, "example@example.com")
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```
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Maintain all metrics along with expvars at `/debug/metrics`:
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This uses the same mechanism as [the official expvar](https://golang.org/pkg/expvar/)
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but exposed under `/debug/metrics`, which shows a json representation of all your usual expvars
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as well as all your go-metrics.
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```go
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import "github.com/rcrowley/go-metrics/exp"
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exp.Exp(metrics.DefaultRegistry)
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```
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Installation
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------------
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```sh
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go get github.com/rcrowley/go-metrics
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```
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StatHat support additionally requires their Go client:
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```sh
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go get github.com/stathat/go
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```
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Publishing Metrics
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------------------
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Clients are available for the following destinations:
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* Librato - https://github.com/mihasya/go-metrics-librato
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* Graphite - https://github.com/cyberdelia/go-metrics-graphite
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* InfluxDB - https://github.com/vrischmann/go-metrics-influxdb
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* Ganglia - https://github.com/appscode/metlia
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* Prometheus - https://github.com/deathowl/go-metrics-prometheus
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* DataDog - https://github.com/syntaqx/go-metrics-datadog
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* SignalFX - https://github.com/pascallouisperez/go-metrics-signalfx
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