micro/metrics/prometheus

Prometheus

A Prometheus "pull" based implementation of the metrics Reporter interface.

Capabilities

• Go runtime metrics are handled natively by the Prometheus client library (CPU / MEM / GC / GoRoutines etc).
• User-defined metrics are registered in the Prometheus client dynamically (they must be pre-registered, hence all of the faffing around in metric_family.go).
• The metrics are made available on a Prometheus-compatible HTTP endpoint, which can be scraped at any time. This means that the user can very easily access stats even running locally as a standalone binary.
• Requires a micro.Server parameter (from which it gathers the service name and version). These are included as tags with every metric.

Usage

    prometheusReporter := metrics.New(server)
    tags := metrics.Tags{"greeter": "Janos"}
    err := prometheusReporter.Count("hellos", 1, tags)
    if err != nil {
        fmt.Printf("Error setting a Count metric: %v", err)
    }