Ferran Rodenas a334eb1a49 Return an error if metric cannot be registered ...

`prometheus.MustRegister` panics if the metric cannot be registered.
Instead, use `prometheus.Register` and return the error if the metric
cannot be registered.

Also, add tests for `RegisterMetricAndTrackRateLimiterUsage`.

Signed-off-by: Ferran Rodenas <frodenas@gmail.com>

2017-10-09 11:05:32 +02:00

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