mimir

Grafana Mimir is an open-source project that provides scalable long-term storage for Prometheus metrics. It is designed to be easy to install and maintain, with a monolithic mode that runs from a single binary without extra dependencies, plus packaged dashboards, alerts, and runbooks for monitoring its own health. Its horizontally scalable architecture can be distributed across multiple machines, and the project reports internal testing handling up to 1 billion active time series. It offers a global view of metrics by aggregating series from multiple Prometheus instances, with a query engine that parallelizes execution for high-cardinality queries. Long-term data is stored in object storage, compatible with AWS S3, Google Cloud Storage, Azure Blob Storage, OpenStack Swift, and S3-compatible stores. Incoming metrics are replicated for high availability, and the architecture supports restarts, upgrades, and downgrades with zero downtime. A native multi-tenant design isolates data and queries between teams, with limits and quality-of-service controls for fair capacity sharing. Documentation covers migration from Thanos, Prometheus, and Cortex, deployment guidance, a getting-started guide, architecture overview, configuration, and production operation. The project is licensed under AGPL-3.0-only and hosts discussions and a community call.