codex

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Anton Panasenko 8660ad6c64 feat: show runtime metrics in console (#10278 )

Summary of changes:

- Adds a new feature flag: runtime_metrics
  - Declared in core/src/features.rs
  - Added to core/config.schema.json
  - Wired into OTEL init in core/src/otel_init.rs

- Enables on-demand runtime metric snapshots in OTEL
  - Adds runtime_metrics: bool to otel/src/config.rs
  - Enables experimental custom reader features in otel/Cargo.toml
  - Adds snapshot/reset/summary APIs in:
    - otel/src/lib.rs
    - otel/src/metrics/client.rs
    - otel/src/metrics/config.rs
    - otel/src/metrics/error.rs

- Defines metric names and a runtime summary builder
  - New files:
    - otel/src/metrics/names.rs
    - otel/src/metrics/runtime_metrics.rs
  - Summarizes totals for:
    - Tool calls
    - API requests
    - SSE/streaming events

- Instruments metrics collection in OTEL manager
  - otel/src/traces/otel_manager.rs now records:
    - API call counts + durations
    - SSE event counts + durations (success/failure)
    - Tool call metrics now use shared constants

- Surfaces runtime metrics in the TUI
  - Resets runtime metrics at turn start in tui/src/chatwidget.rs
- Displays metrics in the final separator line in
tui/src/history_cell.rs

- Adds tests
  - New OTEL tests:
    - otel/tests/suite/snapshot.rs
    - otel/tests/suite/runtime_summary.rs
  - New TUI test:
- final_message_separator_includes_runtime_metrics in
tui/src/history_cell.rs

Scope:
- 19 files changed
- ~652 insertions, 38 deletions


<img width="922" height="169" alt="Screenshot 2026-01-30 at 4 11 34 PM"
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2026-01-30 22:20:02 -08:00