Opsgenie notification doesn't works at Checkmk 2.0.0p3 @ json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[jmelega (Juraj Melega)]

Finally I found error. I had a typo in the domain settings . Instead of https://api.eu.opsgenie.com there was https://app.eu.opsgenie.com.