Sloth
Apache-2.0 SLO generator for Prometheus rules and alerts
Observability / Observability · Apache-2.0 · 2.6k
Reviewed 2026-10-18 · last push 2026-10-18 · repo checked 2026-10-19
What's Good
Apache-2.0 (slok/sloth), release v0.16.0 (2026-04-04). Based on Google's SLO approach. Works as a CLI in CI, a Kubernetes controller with a CRD, or a library, with SLI plugins for common cases and Grafana dashboards for the results. Supports OpenSLO specs too. ★~2.6k.
The Catch
It only generates rules; Prometheus and Alertmanager still do the work, and you must choose good SLIs. The last release was April 2026, and the project status says internal refactoring is in progress. Single-maintainer project.
Verdict
The easiest correct way to get burn-rate SLO alerts in Prometheus.
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