daniel-oai 28b91c7c31
Honor the OTLP metrics temporality preference ( #51220 ) ...
## Why
Some metrics backends require cumulative metrics, while configured OTLP exporters previously always used delta temporality.
## What changed
Read `OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE` for configured HTTP and gRPC metrics exporters. Accept `delta`, `cumulative`, and `lowmemory` case-insensitively, retaining delta for unset, empty, or unrecognized values. Document the setting and preserve existing temporality for the built-in Statsig exporter and runtime snapshots.
## Testing
Update the HTTP loopback test to set the preference in an isolated subprocess and assert that the exported counter uses cumulative aggregation temporality.
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daniel-oai
28b91c7c31