critic

Critic

Critic is a very simple web monitoring tool. It periodically (every 30 seconds) polls URLs provided as values of environment variables with the name prefix WATCH_ and exports them as prometheus metrics.

Exported metrics

Following metrics are exported for each target:

critic_target_is_healthy

The value of this metric will be set to 1 if the probe deems target to be healthy. Target is assumed to be healthy when the HTTP request succeeds with the stats code between 100 and 499, excluding 404.

critic_target_probe_failed_counter

This counter increases every time probe for the target fails (either can't connect or the status code is > 500 or 404)

critic_target_request_duration

Request duration of the last probe in seconds.

critic_target_server_certificate_expiration_time

Unix time of the TLS Certificate expiration. This metric will be exported only for server URLs with https scheme.

critic_target_status_code

HTTP Status code of the last probe. If creating request has failed, value will be 0. In the case that performing request has failed, the value will be 1.