I am trying to use GCP API Gateway URL as webhook URL in Grafana Cloud. Unfortunately, there is not document suggesting the type and format of URL to use. We are facing 405, 404 and 401 errors.
When we browse the GCP API Gateway URL, we were able to view the information of service. But unable to configure in Grafana Cloud.
Will Grafana Cloud accepts GCP API Gateway URL as webhook URL?
Example: https://leonst.gateway.dev/api/auth?key=1r154asdwwidaK8cwlBsdsReukyI
welcome to the 
forum, @nkaki
is this an alerting question? Or are you trying to draw data FROM GCP into Grafana using a datasource plugin like JSON API plugin for Grafana | Grafana Labs ?