title: Creating alert policy from log based metrics doesn't show up any logs in the Alert page
body: <p>I have created a custom metric (query: resource.type=gae_app &quot;protoPayload.methodName=google.appengine.v1.Versions.CreateVersion&quot;)from the Log Explorer and trying to create an alert policy for that. I don't find the resource_type &quot;Log metrics&quot; as referred in many documents/videos.
  If I choose a resource.type=gae_app and refer the custom metric created in the alert configuration, it doesn't show up any logs in the created alert policy.</p>