Run VSTS Build/Release Task only when previous task errors

Question

I am trying to create a Visual Studio Team Services Extension Task for my builds and releases. I need a task that will send out an alert to another system if a previous task (including the default build/test/publish/etc.) fails.

I have already created the task to send the alert. However I do not see a way to kick off the task only if my build fails.

Is there a way in VSTS to run a task if a previous task fails, but not run it if all other tasks were successful?

Answer 1

It is now possible to select a running condition for all tasks with the following possible values:

• Only when all previous tasks have succeeded
• Even if a previous task has failed, unless the build was canceled
• Even if a previous task has failed, even if the build was canceled
• Only when a previous task has failed
• Custom conditions

EDIT:
It is currently part of a preview, you can enable it through the "Preview features" menu after you click on your profile click on VSTS:

And activate the "New Build Editor":

Answer 2

There is no built-in feature.

But you can use the "Rollback" task from the Release Management Utilities to run a powershell script on failure.

• https://marketplace.visualstudio.com/items?itemName=ms-devlabs.utilitytasks