Since it hasn't been mentioned in this entire thread, frame pointers are required to get good high resolution flame graphs.

https://www.brendangregg.com/flamegraphs.html

With systems like Phlare/Pyroscope SRE can monitor application performance in a very granular way in realtime.

https://grafana.com/blog/2023/03/15/pyroscope-grafana-phlare...

https://github.com/grafana/pyroscope