Amnon Heiman c060c0b867 alternator: Add histogram for batch item count ...

This patch adds an estimated_histogram for alternator batch item count.
estimated_histogram can be used with values starting from 1 with an
exponential factor of 1.2, which nicely covers values up to 20, but with
only 22 buckets it can reach all the way to 100 (plus infinity).

Aside from the new histograms for get and write batches, a helper
function was added to return the histogram in the metric format without
changing its resolution (which is the metric’s default behaviour).

The histogram will be reported once per node rather than once per shard.

Signed-off-by: Amnon Heiman <amnon@scylladb.com>

2025-04-06 18:22:13 +03:00

278 KiB

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