schedule at least one task which failed and caused a backout when the revision gets updated with the a fix afterwards

[Archaeopteryx]

Prevent relanding with the same failure or other issues not fixed or new after a backout.

Schedule at least one task which failed and caused a backout when the revision gets updated with the a fix afterwards.

[marco-c]

@Archaeopteryx are you talking about test tasks here? We are currently not running any, so this would mean changing the behavior. How frequent is it to have the same failure on relanding?