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OpenSLO review

Free#12 of 13 in Site Reliability Engineering Platforms

A vendor-neutral SLO schema with CLI validation, not a monitoring or SLO-management platform.

6.2/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

OpenSLO is an open, vendor-agnostic specification for defining service level objectives and indicators for services and applications. It is aimed at teams that want a shared, declarative format for SLO definitions, especially when those definitions need to fit into CI/CD workflows. Its YAML schema covers services, data sources, objectives, budgeting methods, and alert policies. The Oslo CLI can validate OpenSLO definitions, giving teams a way to check the format in their delivery workflow.

The central distinction is that OpenSLO describes reliability intent; it does not operate the systems that measure or manage it. The schema can express metric queries for service level indicators, time windows, and budgeting methods, and can define alert conditions and notification targets. Those definitions are designed to support interoperability between reliability tools. Teams should therefore view OpenSLO as a common language for configuration rather than as a destination for dashboards or live service data.

OpenSLO is open source, with no paid plans described here. It does not itself collect metrics, track SLO performance or error budgets, produce reliability scorecards, or automate SRE workflows. That makes it a fit for organizations seeking consistency and validation across SLO definitions, particularly when connecting definitions to CI/CD. Teams that need a managed SLO platform to calculate performance, monitor budgets, or report reliability should choose a product that provides those operational capabilities instead.

OpenSLO pros and cons

  • Where it wins
    • Defines SLOs, SLIs, objectives, time windows, and budgeting methods in YAML
    • Includes service, data-source, alert-policy, and notification-target objects
    • Oslo CLI validates definitions in CI/CD workflows
  • Where it doesn't
    • Does not collect metrics or track SLO performance
    • Does not provide error-budget tracking or reliability scorecards
    • A specification, not a platform for managing SLO workflows

OpenSLO fact sheet, pricing and score →

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