Enrich Prometheus metrics with info() without triggering cardinality spikes

Use useful metadata in PromQL and recording rules without pushing volatile labels into the hot path.

A practical guide to testing Prometheus’ experimental info() function, building a metadata allowlist, measuring series impact, and proving alerts and SLOs still work.

Created: June 22, 2026

Published: June 22, 2026

Estimated time40 min

LevelIntermediate

Before you startPrometheus 3.x or a test environment where info() is available/enabled.

PlatformsLinux / Docker

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Docker

Run a staging Prometheus with mounted rules and compare cardinality before and after enrichment.

docker composepromtool or prom/prometheus image

Run promtool from a container

docker run --rm -v "$PWD:/work" -w /work prom/prometheus promtool check rules rules/metadata-enrichment.yml

Also available inEnriquecer métricas en Prometheus con info() sin disparar la cardinalidad

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