Export turn cost as an OTEL metric - #40488
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## What changed - Emit `codex.turn.cost_microusd` as a counter with turn, conversation, interruption, speed, and reasoning-effort attributes. Convert the estimated USD string to microdollars, rounding to the nearest microdollar and skipping values that cannot be represented safely. - Start turn-cost collection when an OTLP metrics exporter is configured, even when the OTEL log exporter is disabled. ## Testing - Verify cost conversion, rounding, and metric attributes with an in-memory metrics snapshot. - Verify that a metrics-only OTLP configuration starts the turn-cost worker. GitOrigin-RevId: e60587079f097f10cc1b6d1bf889d3f7a0dc3d5f
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Export turn cost as an OTEL metric
What changed
codex.turn.cost_microusdas a counter with turn, conversation,interruption, speed, and reasoning-effort attributes. Convert the estimated
USD string to microdollars, rounding to the nearest microdollar and skipping
values that cannot be represented safely.
when the OTEL log exporter is disabled.
Testing
metrics snapshot.