Delete topic SMTs

This document explains how to delete Single Message Transforms (SMTs) from an existing Pub/Sub topic, by updating the topic,

To delete topic SMTs, you can use the Google Cloud console, the Google Cloud CLI, the client library, or the Pub/Sub API.

Required roles and permissions

To get the permission that you need to delete topic SMTs, ask your administrator to grant you the Pub/Sub Editor ( roles/pubsub.editor ) IAM role on your project. For more information about granting roles, see Manage access to projects, folders, and organizations .

This predefined role contains the pubsub.topics.update permission, which is required to delete topic SMTs.

You might also be able to get this permission with custom roles or other predefined roles .

You can configure access control at the project level and at the individual resource level.

To delete topic SMTs, follow these steps:

In the Google Cloud console, go to the Pub/Sub Topicspage.

Go to Topics
Click the topic for which you want to delete an SMT.
In the topic details page, click Edit .

The Transforms tab lists all the SMTs that are attached to the topic.
Click the delete button for the SMT you would like to delete.
Click Update .

In the Google Cloud console, activate Cloud Shell.

Activate Cloud Shell

At the bottom of the Google Cloud console, a Cloud Shell session starts and displays a command-line prompt. Cloud Shell is a shell environment with the Google Cloud CLI already installed and with values already set for your current project. It can take a few seconds for the session to initialize.
This command deletes all SMTs associated with the specified topic.

Run the gcloud pubsub topics update command with the --clear-message-transforms flag:
```
gcloud  
pubsub  
topics  
update  
 TOPIC_ID 
  
--clear-message-transforms
```
Replace the following:
- TOPIC_ID : The ID or name of the topic you want to update.
To instead remove a single SMT, refer to Update topic SMTs and create a new message-transforms-file that excludes the SMT you wish to delete.