The five steps
- Nearest rank 8 min
- The dashboard refreshes every second 11 min
- The last five minutes 10 min
- The question the other way round 9 min
- One number for the whole fleet 12 min
The p99 panel every service dashboard has: record latencies as they arrive, answer percentile queries without re-sorting, restrict them to a time window, ask the inverse question, and merge the trackers of every shard into one.