A Golang library for exporting performance and runtime metrics to external metrics systems (i.e. statsite, statsd)
    https://github.com/armon/go-metrics

    This library provides a metrics package which can be used to instrument code, expose application metrics, and profile runtime performance in a flexible manner.

    The metrics package makes use of a MetricSink interface to support delivery to any type of backend. Currently the following sinks are provided:

    • StatsiteSink : Sinks to a statsite instance (TCP)
    • StatsdSink: Sinks to a StatsD / statsite instance (UDP)
    • PrometheusSink: Sinks to a Prometheus metrics endpoint (exposed via HTTP for scrapes)
    • InmemSink : Provides in-memory aggregation, can be used to export stats
    • FanoutSink : Sinks to multiple sinks. Enables writing to multiple statsite instances for example.
    • BlackholeSink : Sinks to nowhere

    A Go metrics interface with fast buffered metrics and third party reporters
    https://github.com/uber-go/tally

    Go port of Coda Hale’s Metrics library
    https://github.com/rcrowley/go-metrics