Add equivalent of `kubectl rollout restart`

[foosinn]

Description

This would allow terraform to restart deployments. Especially useful after deploying other things

Potential Terraform Configuration

resource "kubernetes_rollout_restart" "restart_applciation" {
  apiVersion = "apps/v1"
  kind = "Deployment"

  metadata = {
    "name": "nginx"
    "namespace": "myapp"
  }

  restart_on_create = true  # default value
  restart_on_destroy = true  # default value
}

References

This would provide a much cleaner alternative to https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/blob/master/modules/acm/creds.tf#L85-L99, that also respects current context and network settings.

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[jrhouston]

The way kubectl rollout restart works is by patching the deployment template with the kubectl.kubernetes.io/restartedAt annotation. Rather than adding a new resource for this, you could use the kubernetes_annotations resource to do the same thing:

resource "time_static" "restarted_at" {}

resource "kubernetes_annotations" "example" {
  api_version = "apps/v1"
  kind        = "Deployment"
  metadata {
    name = "nginx-deployment"
  }
  template_annotations = {
    "kubectl.kubernetes.io/restartedAt" = time_static.restarted_at.rfc3339
  }
}

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