Fix env var endpoint override#14353

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Arunodoy18 wants to merge 3 commits intoopen-telemetry:mainfrom

Arunodoy18:fix-env-var-endpoint-override

Commits on Jan 1, 2026

Fix process metrics registration when telemetry metrics level is none
Arunodoy18
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Update pdata comments for invalid usage on zero-initialized instances
Arunodoy18
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Commits on Jan 5, 2026

Fix: Prevent OTEL_EXPORTER_OTLP_*_ENDPOINT env vars from overriding config file endpoints
Arunodoy18
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