Pprof

How to Profile a Go Application: The Complete pprof Guide

How to use Go's pprof toolchain to profile CPU, memory, goroutines, block, and mutex — collect profiles safely in production and act on what you find.

go tool pprof vs go tool trace: Which One Do You Actually Need?

pprof tells you where CPU time went. trace tells you why goroutines weren't running. Both ship with Go. Here's how to pick the right one for your problem.