Tom 02c326f646 [codex] Instrument rollout persistence bytes (#29498) ...

- Add 1%-sampled rollout persistence metrics that report per-item and
per-thread JSON byte totals before and after filtering when metrics
export is enabled.
- Tag each item with its exact response or event variant, including
nested turn-item kinds for conditionally persisted completion events, so
aggregate cloud-storage impact can be estimated by policy choice.

2026-06-23 09:26:30 -07:00

917 B

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