chore: [k190] fix: promtail; clean up metrics generated from logs after a config reload. #12938
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* Update Loki dependency. * Clean up metrics generated from logs after a config reload. Synced from: grafana/loki#12938
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* Update Loki dependency. * Clean up metrics generated from logs after a config reload. Synced from: grafana/loki#12938 * Update README
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* Update Loki dependency. * Clean up metrics generated from logs after a config reload. Synced from: grafana/loki#12938 * Update README
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* azure_exporter: Fix bug which prevents subscription scope from working with only a single region (#6719) * Update postgres exporter (#6780) * Update postgres exporter * Make collector work with first DSN * Enhance docs and test * Update depcheck * Update SNMP exporter (#6904) * Update SNMP exporter * Fix build issues * Update Windows exporter * Update Loki dependency (#6905) * Update Loki dependency. * Clean up metrics generated from logs after a config reload. Synced from: grafana/loki#12938 * Update README * Update changelog * Update loki dep to k190 (#6543) * Update loki dep to k190 * port renames * fix loki push api * Update vmware_exporter * Update prom encoder --------- Co-authored-by: kgeckhart <kgeckhart@users.noreply.github.com> Co-authored-by: Piotr <17101802+thampiotr@users.noreply.github.com>
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Backport 39a7181 from #11882
It is possible to generate metrics from log lines in Promtail. If the config file is reloaded, those metrics are currently not cleaned up. This causes a few issues:
/metricsendpoint.This will help us fix a bug reported in the Grafana Agent.
I suppose no changelog entry is required because PromQL is already designed to handle counter resets? But if you think it's appropriate, I could add a changelog entry?
I tested this change locally using a config file like this:
Promtail config
Then I'd do a
curl localhost:9080/reloadand checkhttp://localhost:9080/metrics.I didn't add a whole lot of unit tests because TBH we should probably focus on adding tests in the Agent, given that we're sunsetting Promtail over time.