By having the same metrics to detect problems no matter how far away or how
silent the users are, we can treat all issues fairly. That, in turn,
allows us to focus on the right issues that have greater impact.

How to make performance useful

The following summarizes the 4 points discussed here, from a slightly different
perspective:

Make performance metrics easy to consume. Do not overwhelm the readers with a
lot of numbers (or words). If there are many numbers, then try to summarize
them into a smaller set of numbers (for example, summarize many numbers into
a single average number). Only notify readers when the numbers change
significantly (for example, automatic alerts on spikes or regressions).