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SigNoz/signoz
SigNoz is an open-source observability platform native to OpenTelemetry with logs, traces and metrics in a single application. An open-source alternative to DataDog, NewRelic, etc. 🔥 🖥. 👉 Open source Application Performance Monitoring (APM) & Observability tool
SigNoz is a self-hosted observability platform that combines logs, metrics, and traces under one roof, using ClickHouse as the storage backend and OpenTelemetry as the collection layer. It targets teams paying Datadog or New Relic bills who want to own their data and avoid per-seat pricing. The LLM observability feature is a recent addition that tracks token usage and prompt/response behavior in AI applications.
ClickHouse as the storage engine is a genuinely good call — columnar storage makes aggregation queries on high-cardinality log data fast in ways that Elasticsearch simply isn't. Building on OpenTelemetry for instrumentation means you're not locked into SigNoz-specific SDKs; switching backends later costs you zero re-instrumentation work. The query builder supports PromQL, ClickHouse SQL, and a GUI builder simultaneously, so you're not forced into one paradigm when your use case doesn't fit it. The community edition is Apache 2.0 licensed with a clearly separated `ee/` directory for enterprise features — no bait-and-switch on the core functionality.
ClickHouse adds real operational weight: you now own a column-store database alongside your application database, and ClickHouse clusters are not trivial to tune or recover when they go wrong. The self-hosted Helm chart pulls in a lot of moving parts (ZooKeeper, ClickHouse, the OTel collector, the query service) — the Helm chart complexity is a genuine support burden and the Docker Compose path is not production-safe. Anomaly detection lives entirely in the enterprise tier, so if you need that without paying, you're writing your own alerting logic on top. The frontend is a large React/TypeScript app that needs pnpm and a separate build pipeline — contributing to or customizing the UI is not a quick task.