Promote a build as soon as a build is completed if the specified build paramter values match. This mechanism is convenient for associating small additional tasks at the end of the build. Compared to making it a part of the build, the difference is that this makes the additional step retryable, and a failure will not render the whole build as a failure.

This criteria can be also handy for consistency; say you have a lot of components built uniformly, and many of them have real test jobs hooked up as the downstream promotion criteria, but some of them might not have any. In such a case, you'll want to immediately promote it.