[meta] OpenMetrics 2.0

[bwplotka]

This issue is to globally track the development of 2.0.

Charter, comms and meeting notes: https://docs.google.com/document/d/1FCD-38Xz1-9b3ExgHOeDTQUKUatzgj5KbCND9t-abZY/edit?tab=t.6h53vr4k28b4
Project: Open Metrics 2.0 (view)

Coordinators: @bwplotka
Contributors: @RichiH @kakkoyun @ArthurSens @dashpole @vesari @krajorama @ywwg

Work has been started. Status: Requirement and Proposal gathering

[bwplotka]

Also, see How to Contribute guide.

[bwplotka]

We published a first release candidate version of OpenMetrics 2.0. It comes with many new features and improvements like native histograms, UTF-8 support, and improved OpenTelemetry compatibility.

Spec: https://prometheus.io/docs/specs/om/open_metrics_spec_2_0
Migration Guide: https://prometheus.io/docs/guides/open_metrics_2_0_migration/

As we work towards the stable release, we are looking for volunteers to help us implement support for OpenMetrics 2.0 in client libraries, and in Prometheus. If you are interested, let us know in #openmetrics Slack channel.

If you have feedback, please open an issue in the prometheus/OpenMetrics repository.