Grafana
AGPL-3.0 dashboarding and observability platform — FedRAMP authorized and self-hostable, with unified metrics, logs, and traces. A sovereign alternative to Datadog at no per-host cost.
Observability
Uptime Kuma
MIT-licensed, self-hosted uptime monitoring and status page tool — HTTP/S, TCP, DNS checks with 90+ notification channels; single-instance architecture with no RBAC or multi-region polling.
SigNoz
MIT-core application observability — unified APM, logs, and traces via OpenTelemetry, with no per-host or ingestion fees. SAML SSO and RBAC require the Enterprise Edition.