richardopenai 8aac63f477 [codex] Add second-based OTEL duration histograms (#27058)
## Why

Exec-server request and connection latencies need fractional-second
histograms. The existing duration API records integer milliseconds and
uses millisecond-scale buckets.

## What changed

- Adds a described duration API that records `Duration` values as
fractional seconds.
- Uses second-scale explicit histogram boundaries.
- Caches duration histograms by name, unit, and description, matching
the existing instrument caching model.
- Covers exact boundaries, representative bucket placement, fractional
sums, and exported metadata.

This PR only adds the duration primitive. It does not add exec-server
adoption.

## Stack

1. #26091: counter descriptions
2. #27057: gauge instruments
3. **#27058: second-based duration histograms**
4. #25019: initialize exec-server OpenTelemetry at startup

Related independent coverage: #27059 tests OTLP HTTP log and trace event
export.

## Validation

- `just test -p codex-otel`
8aac63f477 · 2026-06-15 17:10:52 -07:00
7,500 Commits
2026-04-24 17:49:29 -07:00
2025-04-16 12:56:08 -04:00
2025-04-16 12:56:08 -04:00
2026-04-24 17:49:29 -07:00

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This repository is licensed under the Apache-2.0 License.

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