feat(metrics): add MetricProducer support (fixes #4768) #4770
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Description
Introduces a
MetricProducer
interface and integrates the producer collection intoMetricReader.collect
, enabling the Python SDK to ingest metrics from third-party sources. Adds supporting tests, documentation, and examples.Fixes #4768
Type of change
Please delete options that are not relevant.
How Has This Been Tested?
tox -e py310-test-opentelemetry-sdk -- -k "MetricProducer" -vv (uses uv to provision; passes MetricProducer suite, with the known benign Windows teardown AttributeError in TestLoggingInit.test_dictConfig_preserves_otel_handler)
Does This PR Require a Contrib Repo Change?
Checklist: