Prometheus Blackbox Exporter

Use the multi-target exporter pattern when you want to check an endpoint from the network location where the exporter runs. Define a probe module, have Prometheus request the exporter for a target, and inspect the resulting probe metrics. An HTTP check can validate that a URL responds, while DNS or TCP modules answer different reachability questions. The official guide also shows how relabeling turns a target list into probe requests.

Blackbox Exporter does not provide a dashboard or incident-notification service by itself; Prometheus must scrape the probe metrics and alerting belongs in the surrounding stack. Its configuration documentation notes that probing makes a single connection attempt rather than retrying like a typical end-user client. If a check needs retries or a richer browser journey, choose another monitor type or build that behavior explicitly.