pprof
pprof is a tool for visualization and analysis of profiling data
...The tool helps developers find hot paths, quantify resource usage, and compare profiles across runs to validate performance changes. It is widely used in Go but also has bindings and exporters for other ecosystems, and the repository includes a Go package for reading and writing profiles programmatically. The pprof command can operate on local files or fetch from targets exposing profiling endpoints, supporting iterative, production-oriented workflows. Its design and proto schema make it a lingua franca for profilers that want to interoperate across languages and runtimes.