It's possible to run an individual kubectl delete on each resource or you can run terraform destroy

You'll need to run the following commands:

$ cd logscale-gcp-components/gcp
$ terraform destroy
Do you really want to destroy all resources?
  Terraform will destroy all your managed infrastructure, as shown above.
  There is no undo. Only 'yes' will be accepted to confirm.
 
  Enter a value: yes

Delete the DNS records which were created for $INGRESS_HOSTNAME

Delete the GCS bucket - logscale-terraform-state using the console