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Add tokio runtime metrics #1791

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96c38a7
add tokio runtime metrics
mzacho Mar 17, 2026
84eb12f
cd fuzz && cargo update
mzacho Mar 18, 2026
64fc866
fix test_stats_exist
mzacho Mar 18, 2026
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11 changes: 11 additions & 0 deletions README.md
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Expand Up @@ -137,6 +137,17 @@ accessible by making an HTTP request to either "/stats/prometheus" or "/metrics"

- XDS Connection terminations (`istio_xds_connection_terminations_total`)

#### Tokio metrics

Metrics for the data plane worker pool Tokio runtime.

- Number of worker threads (`tokio_num_workers`)
- Tasks in global queue (`tokio_global_queue_depth`)
- Alive tasks (`tokio_num_alive_tasks`)
- Worker busy duration (`tokio_worker_total_busy_duration_seconds`): Per-worker counter with `worker` label
- Worker park count (`tokio_worker_park_count`): Per-worker counter with `worker` label
- Worker park/unpark count (`tokio_worker_park_unpark_count`): Per-worker counter with `worker` label

## Logging

Ztunnel exposes a variety of logs, both operational and "access logs".
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