GreptimeDB

GreptimeDB is an open-source observability database in which metrics, logs and traces share one columnar engine over object storage and one table model of tags, timestamp and fields. When signals share identifiers like service name, host or trace ID, they can be correlated with SQL joins rather than shuttling data between databases.

Ingestion works through OpenTelemetry, Prometheus Remote Write, the Loki push API or Elasticsearch Bulk, and queried with SQL across all signals and PromQL for metrics, so ingestion can migrate one signal at a time without rebuilding collectors. The README lists reasons to use it: replacing a Prometheus plus Loki or Elasticsearch combination with one backend, outgrowing Prometheus on cardinality or retention without the Thanos or Mimir complexity, long retention on object storage, and storing GenAI telemetry next to infrastructure signals.

GreptimeDB is written in Rust, with an Apache-2.0 licensed core, and is run self-hosted on your own infrastructure. Stable, canary and nightly builds are offered. It suits platform and SRE teams wanting a consolidated, cost-conscious observability backend.