Services monitors (/service-monitors) perform TCP or UDP port checks against a host and port.

1. Go to Infrastructure → Services.
2. Add a service with hostname/IP, port, and protocol (TCP/UDP).
3. Set the check interval (1 minute to 24 hours).
4. Configure alert rules (see Alerting category) to notify on status or response time thresholds.

Common use cases: database ports, message queues, game servers, and internal microservices.