Define a Prometheus bridge

[dashpole]

What are you trying to achieve?

Similar to the OpenCensus metrics bridge, the Prometheus compatibility document should specify an optional Prometheus Registry -> OpenTelemetry MetricProducer bridge.

This allows applications instrumented with prometheus client libraries to be integrated into the OTel SDK and, for example, export OTLP. There is an implementation in Go: https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/bridges/prometheus

Related: open-telemetry/opentelemetry-configuration#576

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@open-telemetry/prometheus-interoperability @jack-berg

[jack-berg]

Sorry, but there is no such bridge in java. There are several ways to bridge metrics from OTEL to prometheus (the link you've included is one such bridge), but currently no bridge from prometheus to OTEL.

[jack-berg]

cc @zeitlinger who I know has experimented with building a java prometheus to OTEL bridge. I believe his experiment was operating as an API level shim, rather than as a metric producer.

[dashpole]

Ah, sorry!