Scaling PMM: A Decoupled Architecture Story

As CRED grew, so did the invisible machinery behind it. Scaling from 100 to over 400 database instances pushed our monolithic Percona Monitoring Management (PMM) to its breaking point. This is the story of how we decoupled our observability stack, pivoting to VictoriaMetrics clustering with our custom vmauth solution and to building a system that can handle 6.45 billion metrics a day. Why Observab