Support for OTLP metrics

[bwplotka]

Similar to Prometheus OTLP support we could allow Thanos receives to receive OTLP metrics in protobuf (or even someday Arrow) format. While there might be challenges (e.g. sanitation of UTF-8 strings until we support it or resource views), we could support it in minimal or not super optimized way for now.

Prometheus Remote Write stays and in fact a new remote write version has promising efficiency gains, but OTLP might allow some some interesting experiments with Otel (including straight from clients pushes!).

Acceptance Criteria

• Thanos Receive can ingest OTLP metrics (proto) as an experimental feature

[aryasoni98]

I would like to work on it . @bwplotka

[jmichalek132]

Hi @bwplotka I have a very rough draft working, I should be able to publish a draft in coming weeks could I get this assigned please?

[frzifus]

Hey, may I ask is there still some interest on that?

[jmichalek132]

Hey, may I ask is there still some interest on that?

I am working on other things now in opentelemetry, so if you want to take over it by any chance feel free to do so, as I won't be able to come back to finish this for some time.

[jmichalek132]

New active PR #7996