unable to get external metric pendo-io/pubsub.googleapis.com|subscription|num_undelivered_messages/&LabelSelector{MatchLabels:map[string]string{resource.labels.project_id: redacted,resource.labels.subscription_id: redacted,},MatchExpressions:[]LabelSelectorRequirement{},}: unable to fetch metrics from external metrics API: the server could not find the descriptor for metric pubsub.googleapis.com/subscription/num_undelivered_messages: googleapi: Error 429: Quota exceeded for quota metric 'Descriptor read requests' and limit 'Descriptor read requests per minute' of service 'monitoring.googleapis.com' for consumer 'project_number:redacted'.
Details:
[
  {
    "@type": "type.googleapis.com/google.rpc.ErrorInfo",
    "domain": "googleapis.com",
    "metadata": {
      "consumer": "projects/redacted",
      "quota_limit": "DescriptorReadRequestsPerMinutePerProject",
      "quota_limit_value": "6000",
      "quota_location": "global",
      "quota_metric": "monitoring.googleapis.com/descriptor_read_requests",
      "service": "monitoring.googleapis.com"
    },
    "reason": "RATE_LIMIT_EXCEEDED"
  }
]
, rateLimitExceeded