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Design Prometheus metrics that don't explode cardinality
domain:
prometheus
· 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps
Label values must be LOW cardinality (status, method, route-template) — never user ids, emails, full URLs
Use histogram buckets tuned to your SLO range; prefer native/exponential histograms where supported
Expose /metrics; scrape-side relabeling drops noisy labels
Record rules for expensive dashboard queries
Known gotchas
One unbounded label (e.g. raw URL path with ids) can take down the whole Prometheus — cardinality is multiplicative across labels
Histograms with default buckets (.005..10s) are useless for batch jobs or sub-ms calls — tune them
rate() needs at least 2 scrapes in the window — 1m rate on 30s+ scrape intervals flatlines
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