Major Description
Some users have expressed concerns about the overhead of metrics collection, and consequently the need to have an option to turn off the metrics collection altogether.
Metrics instrumentation in Solr cannot be itself easily removed or bypassed - in order to provide fine-grained metrics many code paths had to be changed and they now expect the metrics to be present (non-null). However, we can use the mechanism of MetricSupplier to provide singleton no-op implementations of all metrics, which would reduce the CPU overhead to basically the cost of an empty method call, and the memory overhead to a HashMap entry in a MetricRegistry (metric names still need to be tracked).
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