Tux Machines

The Prometheus cardinality issues with systemd unit-related metrics

Posted by Roy Schestowitz on Dec 23, 2022

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This is a general issue for any Prometheus metrics that are related to particular systemd units. You absolutely need to limit what units you report on or ingest metrics for, because some systemd unit names have essentially unlimited cardinality. Any metric that includes their name as a label will thus have label cardinality issues, and in practice this means all per-unit metrics are potentially a problem.

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