A live Spring Boot Actuator dashboard. /actuator/health aggregates component checks; Micrometer meters (Counter, Gauge, Timer) update as you send traffic; and /actuator/prometheus shows the exact scrape format a monitoring stack reads.
Counter http.server.requests climbs, the Timer records each latency (count / mean / max / p95 + a histogram), and the Gauge jvm.memory.used wobbles on its own (gauges sample a live value). Flip the db component DOWN on the health tab and the aggregate /actuator/health turns DOWN — because health rolls up to its worst component (that's what a load balancer's readiness probe reads). The Prometheus tab shows the same numbers in scrape format.