We've noticed an excessive number of Double boxings when recording histogram metrics. They land in https://github.com/DataDog/java-dogstatsd-client/blob/master/src/main/java/com/timgroup/statsd/NonBlockingStatsDClient.java#L522

which is a generic version of https://github.com/DataDog/java-dogstatsd-client/blob/master/src/main/java/com/timgroup/statsd/NumericMessage.java

The value is always boxed as a result of the Double.of call.

It would greatly reduce object allocations if there was a concrete non-generic implementation of NumericMessage for each of the types it supports (int, long and double), and then used by the histogram feature. Arguably just long and double impls should be enough.