IssueTracker

Please provide as much information as possible. At least, this should include a description of your issue and steps to reproduce the problem. If possible please provide a summary of what steps or workarounds you have already tried, and any docs or articles you found (un)helpful.

Problem you have encountered:
When we create a label for a custom log based metric, we have the ability to match on a payload field. If the field is a json array, we will only be able to retrieve the first value , when this value is used in a stackdriver monitoring alert policy documentation.

example of a AuditLog payload containing the IAM bucket policy added/removed:

  serviceData: {
   @type: "type.googleapis.com/google.iam.v1.logging.AuditData"    
   policyDelta: {
    bindingDeltas: [
     0: {
      action: "REMOVE"      
      member: "<redact>"      
      role: "roles/storage.objectViewer"      
     }
     1: {
      action: "ADD"      
      member: "<redact>"      
      role: "roles/storage.objectViewer"      
     }
     2: {
      action: "ADD"      
      member: "<redact>"      
      role: "roles/storage.objectViewer"      
     }
    ]
   }
  }

If we have a label matching on protoPayload.serviceData.policyDelta.bindingDeltas.member named as "policy_member"

And we create a StackDriver monitoring alert policy with the following documentation variable pointing to that label:

"${metric.label.policy_member}"

What you expected to happen:
We expect that the documentation will expand out the policy_member to the 3 element array members, however only the first element is shown.

Steps to reproduce:


Other information (workarounds you have tried, documentation consulted, etc):