Specifies how build step should be executed in case of failures in other steps
will execute step always, even if build was interrupted
will execute step only if build status on the server is "failed"; the server will be asked to obtain the build status
will execute step even if previous step(s) has failed, server will not be queried for build status.
will execute step only if status on server is "successful"; server will be asked for build status
step will not be executed if there are other failed steps