Populating alert tags from GCP labels

[Konstantin Likhomanov]

We're receiving alerts from GCP through the standard webhook integration.

The payload looks like this:

{
  "incident": {
    ...
    "metric": {
      "labels": {
        "metric_label": "value"
      }
    }
    "policy_user_labels": {
      "policy_label": "value"
    }
  }
}

I want to automatically turn these labels (at least the policy ones) into alert tags. Is there a way to do so?

The "{{_payload.customField}}" syntax for alert properties doesn't seem to support nested fields.