`google_cloud_run_v2_service` and max_instance_count set to `0`

[jeremad]

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request.
• Please do not leave +1 or me too comments, they generate extra noise for issue followers and do not help prioritize the request.
• If you are interested in working on this issue or have submitted a pull request, please leave a comment.
• If an issue is assigned to a user, that user is claiming responsibility for the issue.
• Customers working with a Google Technical Account Manager or Customer Engineer can ask them to reach out internally to expedite investigation and resolution of this issue.

Terraform Version & Provider Version(s)

Terraform v1.8.3 on linux_amd64

• provider registry.terraform.io/hashicorp/google v5.39.1

Affected Resource(s)

google_cloud_run_v2_service

Terraform Configuration

resource "google_cloud_run_v2_service" "trader" {
  location     = "europe-west4"
  name         = "example"
  project      = "my_project"
  launch_stage = "GA"

  template {
    execution_environment = "EXECUTION_ENVIRONMENT_GEN2"
    containers {
      image = "europe-west4-docker.pkg.dev/my-project/example/example:latest"

      resources {
        limits = {
          cpu    = "1000m"
          memory = 512 * 1024 * 1024
        }
        cpu_idle = true
      }
    }
    max_instance_request_concurrency = 1000
    scaling {
      min_instance_count = 0
      max_instance_count = *0*
    }
  }
}

Debug Output

No response

Expected Behavior

Either or:

• The maximum number of instances is 0
• The configuration is does not pass validation
• This actual behavior is documented

This behavior is documented absolutely nowhere

Actual Behavior

The maximum number of instance is 100

Steps to reproduce

1. terraform apply

Important Factoids

No response

References

https://cloud.google.com/run/docs/reference/rest/v2/RevisionScaling https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/cloud_run_v2_service#max_instance_count

b/361784995

[ggtisc]

Hi @jeremad!

I'm trying to understand you.

Are you looking for both min_instance_count and max_instance_count values ​​to be equal to 0 when creating a google_cloud_run_v2_service, or some message in the documentation that warns that this is not possible?

[jeremad]

You can ignore the min_instance_count in this issue. When I set max_instance_count to 0, somehow, it's actually set to 100.

[ggtisc]

Confirmed issue!

After executing the code with both values min_instance_count and max_instance_count equal to 0 the max_instance_count is saved in the tfstate file with a value of 100

[whaught]

https://cloud.google.com/run/docs/configuring/max-instances#limits

By default cloud run configures a maximum of 100 instances if the user does not specify any maximum.

[jeremad]

Ok! I missed this in the documentation. That explains part of it, but I would expect the terraform plugin documentation to mention that, since in this case, it's not left out blank, it's explicitly set to another value.