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Prometheus Bridge

Status: Experimental

The Prometheus Bridge allows using the Prometheus Golang client library (github.com/prometheus/client_golang) with the OpenTelemetry SDK.

Usage

// Make a Promethes bridge "Metric Producer" that adds metrics from the
// Prometheus DefaultGatherer. Add the WithGatherer(registry) option to add
// metrics from other registries.
bridge := prombridge.NewMetricProducer()
// Make a Periodic Reader to periodically gather metrics from the bridge, and
// push to an OpenTelemetry exporter.
reader := metric.NewPeriodicReader(otelExporter, metric.WithProducer(bridge))
// Create an OTel MeterProvider with our reader. Metrics from OpenTelemetry
// instruments are combined with metrics from Prometheus instruments in
// exported batches of metrics.
mp := metric.NewMeterProvider(metric.WithReader(reader))

Limitations

  • Summary metrics are dropped by the bridge.
  • Start times for histograms and counters are set to the process start time.
  • It does not currently support exponential histograms.