Gatus

Single Go binary that reads a declarative YAML config of endpoints/conditions, runs checks on a schedule, stores recent results in an embedded SQLite/memory store, and serves a status-page UI plus Prometheus metrics.

Highly scalable for its purpose — stateless, config-driven, cheap to run many replicas of (each just re-reads the same config) — the only shared state is optional persisted history, which is non-critical and can be dropped without breaking checks.

Single stateless pod; config can be mounted as a ConfigMap-equivalent file, and target URLs for other Nexlayer pods should use <podName>.pod:<port> rather than hardcoded hostnames. No external DB required.