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docs: Update queue metrics on multi-main setup (#3434)

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Co-authored-by: Justin Ellingwood <justin@n8n.io>
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Iván Ovejero 2025-08-11 15:53:29 +02:00 committed by GitHub
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docs/hosting/configuration/configuration-examples/prometheus.md
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@ -23,7 +23,7 @@ Both `main` and `worker` instances are able to expose metrics.
To enable queue metrics, set the `N8N_METRICS_INCLUDE_QUEUE_METRICS` env var to `true`. You can adjust the refresh rate with `N8N_METRICS_QUEUE_METRICS_INTERVAL`.
Queue metrics are only available for the `main` instance in single-main mode.
n8n gathers these metrics from Bull and exposes them on the main instances. On multi-main setups, when aggregating queries, you can identify the leader using the `instance_role_leader` gauge, set to `1` for the leader main and `0` otherwise.
```
# HELP n8n_scaling_mode_queue_jobs_active Current number of jobs being processed across all workers in scaling mode.