Questions about the behaviour of Grafana alert conditions.
If I set an alert with is outside range 200 to 200 for probe_http_status_code, I get Alerting but no notification fires.
In detail, the following is the reason.
I was using Prometheus to monitor probe_http_status_code.
So, in the Grafana alert condition settings, I had set “is outside range 200 to 200” as follows.
If the http_status_code was 0, the notification fired as expected, but if the error was a 5xx error, the notification did not fire, even though it was Alerting.
I was stumped, so I set it to above 201 and below 199 as follows.
If anyone knows about this phenomenon, please let me know.