Monitoring

S4 provides built-in observability through Prometheus-compatible metrics and a JSON stats API for dashboards and alerting.

Prometheus Metrics — what every node exports at /metrics, the cluster metrics and the alerts worth having, and a Grafana dashboard for a cluster (grafana/s4-cluster.json)
Stats API — a JSON summary for dashboard widgets and quick checks

Prometheus Metrics

S4 exposes metrics in Prometheus text format on the main HTTP port at /metrics.

S4 provides a lightweight JSON stats endpoint designed for dashboard widgets and quick health checks.

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