cannot override "__name__" in google_monitoring_alert_policy, condition_prometheus_query_language block using the labels option.

[nick-lawrence]

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Terraform Version & Provider Version(s)

Terraform v1.9.8
on linux_amd64

• provider registry.terraform.io/hashicorp/google v6.16.0
• provider registry.terraform.io/hashicorp/google-beta v6.16.0
• provider registry.terraform.io/hashicorp/random v3.6.3
• provider registry.terraform.io/hashicorp/time v0.12.1
• provider registry.terraform.io/hashicorp/tls v4.0.6

Affected Resource(s)

google_monitoring_alert_policy

within that resource condition_prometheus_query_language

Terraform Configuration

This a cut and paste of my partial configuration. The labels doesn't let me set "__name__", the documentation implies that I should be able to set it. I want to be able to set it so that google incident notifications include a metric name for complex queries where 'name' is removed from the query.

resource "google_monitoring_alert_policy" "promql_policies" {
  project      = var.project_id
  for_each     = { for i, policy in local.policies["promql_policies"] : i => policy }
  display_name = each.value["display_name"]
  combiner     = each.value["combiner"]

  dynamic "conditions" {
    for_each = { for i, condition in each.value["conditions"] : i => condition }
    content {
      display_name = conditions.value["display_name"]
      condition_prometheus_query_language {
        query                     = conditions.value["query"]
        duration                  = conditions.value["duration"]
        disable_metric_validation = true

        # >>>>>>> This is the important part
        # >>>>>>> Overriding "__name__" causes the apply to fail
        labels = { "__name__" = conditions.value["metric_name"] }
      }
    }
  }

  severity = each.value["severity"]
  enabled  = each.value["enabled"]
  documentation {
    subject   = "${each.value["documentation"]["subject"]} (${var.project_id})"
    mime_type = "text/markdown"
    content   = each.value["documentation"]["content"]

  }

Debug Output

No response

Expected Behavior

Intending to override/set the "__name__" label for my query.

The reason is when goggle sends me a notification email, it includes a
metric : missing

label.

I believe that 'metric' is the "__name__" from the query, because my query is complex, the label is not in the result, and thus it's reported as missing.

I'd like to set that to avoid confusion when reading the notification.

Documentation implies that I should be able to do this:

labels - (Optional) Labels to add to or overwrite in the PromQL query result. Label names must be valid. Label values can be templatized by using variables. The only available variable names are the names of the labels in the PromQL result, including "name" and "value". "labels" may be empty. This field is intended to be used for organizing and identifying the AlertPolicy

Actual Behavior

Apply fails with:

"__name__": PromQL names beginning with __ are reserved for internal use.

Steps to reproduce

1. terraform apply

Important Factoids

I tried using "name", but this just created another label. Same thing with "metric" which is how google displays this.

It seems like "name" should be allowed, but is being blocked.

References

No response