The article states that almost everyone is doing percentile latencies wrong by averaging on agent level (thus creating nonsensical data) and proposes using the

The article states that almost everyone is doing percentile latencies wrong by averaging on agent level (thus creating nonsensical data) and proposes using the per­cent­age of requests that are over the thresh­old instead, a metric that can be averaged properly. He additionally suggests to always use actionable dashboards catered to its users (dev/ops/manager).