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The scheduler is behaving correctly, which is the part that confuses people. It optimises placement at admission time and never revisits, so a cluster drifts out of balance by design.

A specific configuration trap with a clean explanation. Both controllers act on the same signal from opposite directions, and the result oscillates.

Over-requested CPU and memory can prevent efficient node packing. Cutting them safely is a measurement problem with a reliability trap sitting in the middle of it.