Histogram buckets are too small

[2color]

Problem

HTTP gateway requests for non-cached blocks can often take much longer than a couple of seconds. In fact, it's not uncommon for them to take ~60 seconds or more.

Given that, the current bucket configuration for the histograms exposed by Rainbow don't make sense, since their tuned for much quicker responses which are rather unlikely in an uncontrolled peer-to-peer network:

rainbow/metrics.go

Line 29 in ad18bc8

Buckets: []float64{0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 30, 60},

Suggestion

Add a bunch of larger bucket sizes, like we do in boxo:

https://github.com/ipfs/boxo/blob/0f223aada9b8beefe449b94ee9601d917f482121/gateway/metrics.go#L17-L20

Related: https://github.com/ipshipyard/waterworks-infra/issues/141