Currently, the "Issue custom field updater" action can only be added as a "build step".

However, it would be nice to have this available as a "Post-build action" so that issues may be updated only when the build succeeds, and not before every build attempt.

Our use case: We would like to update one or more custom fields on all issues matched in the 'Default selector' with values taken from different Jenkins build parameters.

(There is a similar request for the "Progress JIRA issues by workflow" action as JENKINS-20422)