This page describes how to delete Cloud Deploy resource, including the following:
Delete a delivery pipeline
You can delete a delivery pipeline from the Google Cloud console or using the gcloud CLI.
Delete a delivery pipeline using the Google Cloud console
In the Google Cloud console, navigate to the Cloud Deploy Delivery pipelines page to find the delivery pipeline you want to delete.
Click the name of the delivery pipeline you want to delete.
The Delivery pipeline details page is shown.

Click Delete.
Delete a delivery pipeline using the gcloud CLI
If you have a delivery pipeline without any subresources (releases or rollouts), you can delete it by running the following command:
gcloud deploy delivery-pipelines delete PIPELINE_NAME
If the pipeline you want to delete has any releases or rollouts associated with
it, you need to include the--force flag in order to delete the pipeline and
those subresources: