Blackbox exporter usage
From wikinotes
In addition to the prometheus **targets** page
Metrics
probe_success
: the probe passed (no search results if no passes!)up
: the metric was reachablepromhttp_metric_handler_requests_total
up{instance="https://willpittman.net"} absent_over_time(promhttp_metric_handler_requests_total{instance="https://willpittman.net", code="200"}[1s])