resource 'monitoring_alert_policy' field 'documentation'.'content' not support variable

[desireezhu]

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Terraform Version

Terraform V1.2.0

Affected Resource(s)

• google_monitoring_alert_policy

Terraform Configuration Files

resource "google_monitoring_alert_policy" "dlp_api_see_errors" {
  project      = PROJECT_NAME
  display_name = "API is seeing errors"
  combiner     = "OR"
  
  conditions {
    display_name = "API is seeing errors"

    condition_threshold {
      filter          = "metric.type=\"kubernetes.io/container/restart_count\" AND resource.type=\"k8s_container\" AND resource.label.\"namespace_name\"=\"test\""
      duration        = "60s"
      comparison      = "COMPARISON_GT"
      aggregations {
        alignment_period     = "60s"
        per_series_aligner   = "ALIGN_SUM"
        cross_series_reducer = "REDUCE_SUM"
      }

      trigger {
        count   = 1
      }
    }
  }

notification_channels = "${concat(google_monitoring_notification_channel.ndw_alerting_email.*.id, google_monitoring_notification_channel.ndw_alerting_phone.*.id)}"

  documentation {
    mime_type = "text/markdown"
    content   = "Pod: \"${resource.label.pod_name}\" Container: \"${resource.label.container_name}\""
  }
}

Debug Output

Error: Variables not allowed
  on .... line 81:

  81:   "Pod: \"${resource.label.pod_name}\" Container: \"${resource.label.container_name}\""

Variables may not be used here.

Panic Output

Expected Behavior

  documentation {
    mime_type = "text/markdown"
    content   = "Pod: \"${resource.label.pod_name}\" Container: \"${resource.label.container_name}\""
  }

Variables should be supported in the Documentation field for GCP monitoring_alert_policy as describe https://cloud.google.com/monitoring/alerts/doc-variables.

Actual Behavior

It reports 'Error: Variables not allowed' if variable is put in documentation content filed in terraform

Steps to Reproduce

1. terraform apply

Important Factoids

References

• b/275110306

[melinath]

This is a Terraform syntax error. One possible issue is that the cloud alerting variable syntax is the same as the Terraform interpolation syntax - you need to escape with $${.

See hashicorp/terraform#24391 for other potential causes.

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