Show HN: Promcap – cap Prometheus metric cardinality before it OOMs your stack

Category: library

Tags: prometheus, cardinality, go-library

Score: 7.0/10 (Innovation: 6, Technical: 7, Documentation: 8, Utility: 7)

Promcap is a Go library that wraps Prometheus metric vectors with a configurable cardinality cap, preventing unbounded label combinations from causing out-of-memory errors. It offers a unique in-process approach with overflow buckets, allowlists, and optional LRU eviction, making it a practical tool for taming high-cardinality metrics at the source.

Target audience: backend devs, devops, site reliability engineers

Repository: https://github.com/eben-vranken/promcap · Go · MIT · 2 stars

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