Show HN: I built a tool that finds unused Prometheus metrics

Category: observability

Tags: prometheus, observability, cost-optimization

Score: 7.8/10 (Innovation: 7, Technical: 7, Documentation: 9, Utility: 8)

Cardamon is a metric auditor for Prometheus that identifies unused metrics by cross-referencing the TSDB with query logs, alerting/recording rules, and Grafana dashboards, then generates drop rules to reduce storage. It solves a genuine operational pain point at scale with a clever combination of existing data sources, and is well-documented with a polished UI.

Target audience: devops, site reliability engineers, platform engineers

Repository: https://github.com/dominikhei/cardamon · Go · Apache-2.0 · 106 stars

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