cabify / gotoprom / 138

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Build prometheus.Histogram instead of Observer

The unprecise usage of `prometheus.Observer` instead of
`prometheus.Histogram` may be misleading, since both `Histogram` and
`Summary` interfaces embed the `Observer` interface.

This is a breaking change since previous code won't compile with this
version, so there's no better moment (except for v2) for doing this than
going v1.

2 of 2 new or added lines in 2 files covered. (100.0%)

278 of 281 relevant lines covered (98.93%)

22.0 hits per line