> ## Documentation Index
> Fetch the complete documentation index at: https://trunk-4cab4936-mintlify-6c165523.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Merge Queue: Per-state duration metric

> A new Prometheus metric breaks queue time down by state, and percentile gauges are now documented for every duration histogram.

**The Prometheus metrics endpoint now exposes a single metric that breaks queue time down by state.**

`mq_pr_state_duration_1h_seconds` reports the time PRs spent in each individual queue state on a `state` label, covering `not_ready`, `pending`, `testing`, `tests_passed`, `pending_failure`, and the terminal states. One metric replaces the need to add a new series each time you want to chart another phase of the queue.

* **Decompose Time in queue by state.** Select `state=~"pending|testing|tests_passed|pending_failure"` to see exactly which phase is driving your queue time.
* **Percentile gauges are now documented.** Every duration histogram on the endpoint also emits `_p50`, `_p75`, `_p90`, `_p95`, and `_p99` gauges you can read directly, without a `histogram_quantile()` over `_bucket` series.
* **Existing metrics are unchanged.** `mq_pr_wait_duration_1h_seconds` and `mq_pr_test_duration_1h_seconds` keep emitting the same values, so current dashboards and alerts continue to work.

See [Per-state durations](/merge-queue/administration/metrics#per-state-durations) for the full label reference, PromQL examples, and guidance on when to prefer the new metric over the existing ones.