pyrra
Making SLOs with Prometheus manageable, accessible, and easy to use for everyone!
The Lens
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
Updated Mar 2026
Pyrra makes it manageable. You define your SLO (service level objective, like 'this API should succeed 99.9% of the time') and Pyrra generates the Prometheus recording rules, alerts, and dashboards automatically.
Everything is free under Apache 2.0. No paid tier, no cloud, no account. It runs alongside your existing Prometheus stack and integrates with Grafana for visualization.
The catch: this is a niche tool. If you're not already running Prometheus, Pyrra adds no value: it's specifically an SLO layer on top of Prometheus/Thanos. The reflect that narrow audience. And SLOs only matter if your team actually acts on error budget alerts. Pyrra generates the math and the alerts, but the organizational discipline to respond is on you.
Free vs Self-Hosted vs Paid
fully freeFully open source under Apache 2.0. No paid tier. Runs as a small Go binary alongside your existing Prometheus stack.
Infrastructure cost: Negligible. Pyrra itself uses minimal resources. Your Prometheus instance might use slightly more memory for the additional recording rules it generates, but we're talking megabytes.
What it replaces: Manually writing Prometheus recording rules and alerting rules for SLOs. If you've ever spent a day writing multi-burn-rate alerts by hand, Pyrra does it in a YAML definition. At $75/hr engineering time, it saves a day per SLO definition, that's $600 in time for each SLO you'd otherwise hand-craft.
Free. Requires an existing Prometheus stack.
What to do by team size
- Solo
- Only if you're already running Prometheus. SLOs are overkill for personal projects.
- Small team
- Useful once you have production services with uptime requirements.
- Medium team
- Good fit. Standardize SLO definitions across services. The dashboards give leadership visibility.
- Large team
- Essential if you're doing SRE properly. Pair with Grafana dashboards for executive reporting.
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A low score is not a verdict on quality. Young and niche tools start low by design. How we calculate scores
Trust Signals
License: Apache License 2.0
Use freely. Patent grant included.
Commercial use: ✓ Yes
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