If a step in a stage fails, you will need to create a new snapshot if a new version of a project is required to resolve the issue. However, there may be cases where the resolution does not require a new project version to be built and a new snapshot to be created, and it is undesirable to start over at the beginning of the pipeline. In such cases you can replay the failed snapshot in the stage. When replaying a snapshot, the stage starts at the very beginning. That is, at the first gate, or at the first step if there are no gates.
To replay a failed stage, click on the replay stage 
icon within the header of the target stage .or in the top right corner of the stage details page
