SigNoz

SigNoz is the open-source Datadog. Logs, traces, and metrics in a single application, built natively on OpenTelemetry with ClickHouse (the same storage Uber and Cloudflare use) under the hood. No vendor lock-in, no surprise bills, no sending your data to someone else's cloud.

Having all three observability pillars in one tool makes correlation trivial — click a slow trace, see the related logs, check the metrics. Compared to Datadog (powerful but expensive), SigNoz gives you 80% of the features at 0% of the cost if self-hosted. Compared to Grafana + Loki + Tempo (more flexible, more moving parts), SigNoz is simpler to operate. Compared to Jaeger (traces only), SigNoz does everything.

Use this when you need full observability on a budget and want to own your data. Skip this if you need Datadog's APM depth or have a team that already knows the Grafana stack.

The catch: self-hosting ClickHouse at scale requires real ops expertise. The managed offering exists but the open-source version is the draw. And OpenTelemetry instrumentation still has rough edges in some languages.