KIP-727 — Add --under-preferred-replica-partitions option to describe topics comman

Discussion AdminBroker

KIP-727 adds a `--non-preferred-leader` (human-readable) and `--non-preferred-leader-json` (JSON) option to `kafka-topics.sh --describe` to list partitions whose current leader is not the preferred (first) replica. Without this filter, identifying unbalanced partition leadership that causes broker egress skew requires parsing the full topic description output or inspecting controller logs.

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