Default histogram buckets for response duration
Default histogram buckets for response duration

https://github.com/prometheus/client_golang/blob/d89cf5a/prometheus/histogram.go#L63

5ms, 10ms, 25ms, 50ms, 100ms, 250ms, 500ms, 1s, 2.5s, 5s, 10s

This is an increase in the number of labels, which means storing a bit
more data in prometheus and makes the queries more expensive. However it
covers a much more interesting range of latencies for network services,
which is what router is measuring.

alphagov/router