Werk #11330: nimble_latency: changed metric unit to percent of total volume

The check nimble_latency measures the latency of read and write I/O operations. The data is captured as the number of operations within several latency ranges (e.g. 1-2 milliseconds, 2-5 milliseconds, etc.). The data was reported as a time interval, rather than a count. This has been fixed, so that the number of operations within each range is now now shown as a percentage of the total number of operations across all the ranges.

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