The unified OpenTelemetry backend — with SQL + PromQL on object storage. GreptimeDB is an open-source observability database built for Observability 2.0 — treating metrics, logs, and traces as one ...

For teams who want a durable event stream inside Postgres. The model is closer to Kafka (log) than to ActiveMQ or RabbitMQ (task message queue). Shared event log, independent per-consumer cursors, ...