GitHub Actions is a good example of systems thrown together that at face value have something to offer until they get put under stress.
Just now I found:
* a job that's > 1 month old, still running
* another job that started 2 hours ago that had 0 output
* a job that was marked as pending, yet I could rerun it
* auto-merges that don't happen
* pull requests show (1), click it, no pull requests visible
Makes me wonder in how many places state is stored, because there is some serious disconnect between them. replies(1):