Expose /debug/pprof

[lidel]

To investigate issues like #92 we need to port some features from Kubo and expose them on the "metrics" port, potential candidates:

• goroutine dump
  • curl localhost:5001/debug/pprof/goroutine\?debug=2 > ipfs.stacks
• 30 second cpu profile
  • curl localhost:5001/debug/pprof/profile > ipfs.cpuprof
• heap trace dump
  • curl localhost:5001/debug/pprof/heap > ipfs.heap
• memory statistics (in json, see "memstats" object)
  • curl localhost:5001/debug/vars > ipfs.vars
• system information
  • ipfs diag sys > ipfs.sysinfo

Ref. https://github.com/ipfs/kubo/blob/master/docs/debug-guide.md

[lidel]

@willscott @aarshkshah1992
with this, we could debug staging over ssh (incl. caboose)

[willscott]

it looks like we already have this on the metrics port

[willscott]

https://github.com/ipfs/bifrost-gateway/blob/main/handlers.go#L34-L38

[lidel]

Indeed! Adin added them already 🙌

I'll reboot staging with GRAPH_BACKEND=true and we wait a few hours until it gets wonky again.
Let's continue in #92