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The best open source alternative to Prometheus is GreptimeDB. If that doesn't suit you, we've compiled a ranked list of other open source Prometheus alternatives to help you find a suitable replacement.
Prometheus alternatives are mainly Log Management Tools but may also be Time Series Databases. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Prometheus.
Cloud-native observability database unifying metrics, logs, and traces with sub-second queries, 50x cost reduction, and seamless OpenTelemetry integration.

GreptimeDB is a cloud-native, real-time observability database that revolutionizes how organizations handle metrics, logs, and traces. Built for OpenTelemetry and modern cloud environments, it delivers sub-second query performance at petabyte scale while dramatically reducing operational complexity.
Key benefits include:
Trusted by companies like Li Auto (reduced traffic costs by 50%, storage costs by 98%), SGCC (2x write performance, 5x query performance), and others who have migrated from InfluxDB, Loki, and Thanos to achieve superior performance and simplified operations.