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mimir
Grafana Mimir provides horizontally scalable, highly available, multi-tenant, long-term storage for Prometheus.
Mimir [1] is what we use where I work. We are very happy with it, and we have very long retention. Previously, our Prometheus setup was extremely slow if you went past today, but Mimir partitions the data to make it extremely fast to query even long time periods. We also used Thanos for a while, but Mimir apparently worked better.
[1] https://grafana.com/oss/mimir/
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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TimescaleDB
An open-source time-series SQL database optimized for fast ingest and complex queries. Packaged as a PostgreSQL extension.
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Grafana
The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.