Grafana Webook to Trigger Jenkins Job fails to post data. Logs errors: Missing receiver, Missing group labels

Hello I am using grafana version Grafana v9.5.8. I have set up a webhook to trigger jenkins job on an alert. The job is triggered however no payload is received in the POST parameter. Upon checking the logs I found following:

level=error msg=“Missing receiver”
level=error msg=“Missing group labels”

Any help resolving this is appreciated.