MaicoTimmerman opened a new pull request, #54986:
URL: https://github.com/apache/airflow/pull/54986
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Whenever the `statsd_exporter`'s mapping is changed, the deployment will
need to restart. This loses some metrics. The `statsd_exporter` exposes a
lifecycle API:
https://github.com/prometheus/statsd_exporter?tab=readme-ov-file#lifecycle-api
in order to reload the mapping.
This is great, because we can reload mappings without losing metrics and
downtime. However, quoting the Kubernetes documentation:
> A container using a ConfigMap as a
[subPath](https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath)
volume mount will not receive updates when the ConfigMap changes.
In this MR we resolve it, by mounting all files from the Statsd ConfigMap in
the `/etc/statsd-exporter`. This results in the same end result in the
container filesystem, as it only contains a single file (`mappings.yml`).
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