promtail: auto-prune stale metrics #1683
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…metrics pipeline stage after an idle period. Signed-off-by: Edward Welch <edward.welch@grafana.com>
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cyriltovena
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Feb 12, 2020
cyriltovena
reviewed
Feb 12, 2020
cyriltovena
reviewed
Feb 12, 2020
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Fixes #1667
Given the dynamic nature of labels as outlined in that issue, it's possible to create metrics stage configuraitons which could create an unbounded growth of exported metrics.
This change should auto-prune metrics if they have not been used within a configurable time period.
The pruning takes place on the same thread and after Collect is called, this guarantees their last output is reported before pruning.
I debated if this should be done in a separate go routine but we would end up holding the same lock so it didn't seem like it would add much value doing it on a separate thread.
Signed-off-by: Edward Welch edward.welch@grafana.com