Several years back when I was working at Google I made a mistake that caused some of the special results in the knowledge cards to become unclickable for a small subset of queries for about an hour. As part of the postmortem I had to calculate how many people likely tried to interact with it while it was broken. It was a lot and really made me realize the magnitude of an otherwise seemingly small production failure. My boss didn't give me a hard time, just pointed me toward documentation about how to write the report. And crunching the numbers is what really made me feel the weight of it. It was a good process.

I feel for the engineer who has to calculate the cost of this bug.