When I was on the Google Docs team, we did a weekly bug triage where we’d look for new issues and randomly assign them to teammates to investigate. One week, we had a new top error by a wide margin.It was a fatal error. This means that it prevented the user from editing without reloading. It didn’t correspond to a Google Docs release. The stack trace added very little information. There wasn’t an associated spike in user complaints, so we weren’t even sure it was really happening — but if it was...