I work at a middling SV company, and I see people taking averages of percentiles (or, even crazier, percentiles of percentiles) every day - that is, each server computes its own "50%/90%/95% latency" of all requests, sends it to a central time-series database, and the Grafana console averages them all to show a "nice" graph.  They are used for everything from alerts to launch decisions.It's driving me crazy because that makes no sense: you can't average percentiles, you will get bogus numbers that randomly jumps up and down based on aggregation (how many servers you have, which tag sets you use, and so on).  And I'm apparently the only one who is seriously bothered.  Everyone else is somewhere between "Eh, that's the best data we have." and "What do you mean the numbers are wrong?"Is this normal?