Fixes for crashes with conflicting metric values #72
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If someone is emitting negative counters we shouldn't even register the metric for them
This patch simply moves the error message from a log.Fatalf() to a log.Errorf() to continue on. Fixes prometheus#63
Move addition of metric to "Elements" until after a successful registry with prometheus, otherwise we'll continue to increment a metric which isn't registered
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This PR contains the fixes for #63
I've left them as separate commits for easier review, if preferred I can squash these as well.
cc: @grobie