"Having problems" in this world (any kind, not only due to the github scale!) is something that happens - we are not perfect and we work on an incredible amount of layers of complexity.

It is sufficient to actually touch production code on a daily basis to see that it can happen to the best, with the best observability systems or processes. The key is avoiding blaming, and understanding iteratively how to fix the problems underneath (faster recovery, detection time, and so on).