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

History

..

harness

[codex] reduce module visibility (#16978)

2026-04-07 08:03:35 -07:00

suite

[codex] Add second-based OTEL duration histograms (#27058)

2026-06-15 17:10:52 -07:00

tests.rs

feat: metrics capabilities (#8318)

2026-01-08 11:47:36 +00:00