tail amplification term
fan-out making p99 worse downstream
If you fan out to 100 services and each has p99 = 100ms, your p99 is much worse — you wait for the slowest of 100. The math punishes scale.
fan-out making p99 worse downstream
If you fan out to 100 services and each has p99 = 100ms, your p99 is much worse — you wait for the slowest of 100. The math punishes scale.