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docs(observability/metrics): document the metrics package#158

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docs(observability/metrics): document the metrics package#158
xytan0056 wants to merge 1 commit into
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pr0-docs

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@xytan0056 xytan0056 commented Jul 7, 2026

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add Tango Metrics Inventory RFC into the repo. Covers the Emitter contract, metrics invetnory, context propagation design and other utils and their usage.

@xytan0056 xytan0056 force-pushed the pr0-docs branch 5 times, most recently from ea9e0ef to d01c936 Compare July 7, 2026 23:37
@xytan0056 xytan0056 marked this pull request as ready for review July 7, 2026 23:39
@xytan0056 xytan0056 requested review from a team as code owners July 7, 2026 23:39
- shared metric-name, op-name, and tag-key constants
- default histogram buckets sized for RPC latency and large target counts
- an in-flight gauge helper that owns the atomic counter callers otherwise reinvent
- a failure classifier that reuses the errors package

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@justinwon777 place holder for errors package design RFC

@xytan0056 xytan0056 force-pushed the pr0-docs branch 3 times, most recently from f8b5223 to a1249f6 Compare July 7, 2026 23:52
Ports the Tango Metrics Inventory RFC into the repo. Covers the
Emitter contract, buckets, TrackInFlight, RecordFailure, context
propagation, shared constants, and OSS / internal / CLI usage.
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