Promote MetricPoint reclaim feature for delta aggregation from experimental to stable

[CodeBlanch]

For the experimental feature see: #2360

This issue is for tracking making this a stable feature.

[vchirikov]

we have a 17.4 MB endpoint "/metrics" (otel -> prometheus exporter) because of the old metrics, waiting for this feature. Is there any news about this?

p.s. ~~I will try to use OTEL_DOTNET_EXPERIMENTAL_METRICS_RECLAIM_UNUSED_METRIC_POINTS and send the results~~ looks like https://github.com/open-telemetry/opentelemetry-dotnet/pull/5546 should be released first

[cijothomas]

we have a 17.4 MB endpoint "/metrics" (prometheus exporter) because of the old metrics, waiting for this feature. Is there any news about this?

p.s. ~I will try to use OTEL_DOTNET_EXPERIMENTAL_METRICS_RECLAIM_UNUSED_METRIC_POINTS and send the results~ looks like #5546 should be released first

The feature tracked by this is only for DELTA... If you are using Prometheus, then this won't help you, as prometheus only accepts Cumulative.

[yoziv]

When is this expected ?

[cijothomas]

When is this expected ?

There is no ETA for this. If you are using the experimental feature, we'd love to get any feedback you have on the feature. We don't have enough feedback to confidently promote this feature to stable. It is also possible that the current approach could be revisited to make it less complex.