Fix CAR and other metrics

[lidel]

Some things I've noticed while adding CAR panels to bifrost-gw staging (see "bifrost-gateway daemon" section)

• car metrics (histograms) looks to be capped at 1m – need to verify in Caboose limits CAR responses to 1 minute filecoin-saturn/caboose#76
  • *_car_peer_success|failure* (caboose)
  • *_car_success|failure* (caboose)
• car size metric (*_fetch_size) looks to be capped at 4MiB – need to verify Caboose limits CAR responses to 4MiB filecoin-saturn/caboose#75
• boxo/gateway – fix(gw): widen duration histograms and cleanup ipfs/boxo#265
  • IPFSBackend aapi call capped at 1m
  • GET durations (global and per type) capped at 1m

I think the first step is to add more buckets beyond 1m, let's say until 5m.

[willscott]

• I don't see limits for 4MiB / 1min in caboose code anywhere obvious - i wonder if these are limits imposed from the saturn side?

[aarshkshah1992]

@willscot @lidel

Identified RC for #75 . filecoin-saturn/caboose#77

4Mib was because of using block size buckets for CAR size histrogram. The above PR takes care of that.

[lidel]

Thanks @aarshkshah1992!

Closed in 185727b (filecoin-saturn/caboose#77) and d8d2849 (ipfs/boxo#265)