---
title: "Merge Queue Failure Rate Statistics"
date: 2026-03-11
tags:
  - API
  - Merge Queue
description: "A new failure_rate endpoint is available in the merge queue statistics API, returning the ratio of failed to total PRs leaving the queue, broken down by time intervals."
---

The endpoint `GET /repos/{owner}/{repository}/stats/failure_rate` returns the failure rate of pull requests in the merge queue, broken down by time intervals.

Each interval includes:

- **total**: the number of pull requests that left the queue
- **failures**: the number of pull requests that were not merged
- **failure_rate**: the ratio of failures to total (between 0.0 and 1.0)
Results are grouped by **base branch**, **partition**, **queue**, and **priority rule**, making it easy to identify which queues or branches have the highest failure rates.

## Filtering

You can filter results using query parameters:

- `base_ref` — filter by target branch (e.g., `main`)
- `partition_name` — filter by partition
- `queue_name` — filter by queue name
- `priority_rule_name` — filter by priority rule
## Use cases

- Monitor merge queue health over time
- Identify queues or branches with unusually high failure rates
- Track the impact of CI or configuration changes on merge success