status-reconciler ensures that changes to blocking presubmits in Prow configuration while PRs are
in flight do not cause those PRs to get stuck.
When the set of blocking presubmits changes for a repository, one of three cases occurs:
- a new blocking presubmit exists and should be triggered for every trusted pull request in flight
- an existing blocking presubmit is removed and should have its' status retired
- an existing blocking presubmit is renamed and should have its' status migrated
The status-reconciler watches the job configuration for Prow and ensures that the above actions
are taken as necessary.
Note that status-reconciler is edge driven (not level driven) so it can't be used retrospectively.
To update statuses that were stale before deploying status-reconciler,
you can use the migratestatus tool.