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This series Adds a pseudo-floating-point histogram implementation.
The histogram is used for time_estimated_histogram a histogram for latency tracking and then used in storage_proxy as a more efficient with a higher resolution histogram.
Follow up series would use the new histogram in other places in the system and will add an implementation that supports lower values.
Fixes#5815Fixes#4746
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* amnonh-quicker_estimated_histogram:
storage_proxy: use time_estimated_histogram for latencies
test/boost/estimated_histogram_test
utils/histogram_metrics_helper Adding histogram converter
utils/estimated_histogram: Adding approx_exponential_histogram
d17b05e911