Removed metric name validation when using a CustomSampleMappingBuilder#519

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LiamClarkeNZ wants to merge 1 commit intoprometheus:mainfrom

LiamClarkeNZ:NonValidatingDropwizardMappings

Commits on Dec 24, 2019

Removed metric name validation when using a CustomSampleMappingBuilder to allow usage on arbitrarily named metrics
Liam Clarke
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