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d82a31f15f
There are two metrics to help observe base-write throttling: * current_throttled_base_writes * last_mv_flow_control_delay Both show a snapshot of what is happening right at the time of querying these metrincs. This doesn't work well when one wants to investigate the role throttling is playing in occasional write timeouts.s Prometheus scrapes metrics in multi-second intervals, and the probability of that instant catching the throttling at play is very small (almost zero). Add two new metrics: * throttled_base_writes_total * mv_flow_control_delay_total These accumulate all values, allowing graphana to derive the values and extract information about throttle events that happened in the past (but not necessarily at the instant of the scrape). Note that dividing the two values, will yield the average delay for a throttle, which is also useful. Closes scylladb/scylladb#18435