Amnon Heiman 5ac20ac861 Reduce the number of per-scheduling group metrics ...

This patch reduces the number of metrics ScyllaDB generates.

Motivation: The combination of per-shard with per-scheduling group
generates a lot of metrics. When combined with histograms, which require
many metrics, the problem becomes even bigger.

The two tools we are going to use:
1. Replace per-shard histograms with summaries
2. Do not report unused metrics.

The storage_proxy stats holds information for the API and the metrics
layer.  We replaced timed_rate_moving_average_and_histogram and
time_estimated_histogram with the unfied
timed_rate_moving_average_summary_and_histogram which give us an option
to report per-shard summaries instead of histogram.

All the counters, histograms, and summaries were marked as
skip_when_empty.

The API was modified to use
timed_rate_moving_average_summary_and_histogram.

Closes #11173

2022-08-11 13:31:19 +03:00

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