branch-4.1: [fix](memtable) use CPU metrics delta for CPU pressure detection in adaptive flush controller #62744#62943
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…daptive flush controller (#62744) ### What problem does this PR solve? Related PR: #60617 Problem Summary: `AdaptiveThreadPoolController::is_cpu_busy()` previously used normalized 1-minute load average as a proxy for CPU usage. This could misclassify IO wait pressure as CPU pressure and make adaptive flush thread shrinking too aggressive. This PR changes CPU pressure detection to use deltas of the existing `doris_be_cpu` metrics from `SystemMetrics`. It aggregates the existing CPU counters, computes CPU busy ratio from consecutive samples, and treats `iowait` as idle time for this decision path.
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May 13, 2026
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Cherry-picked from #62744