KIP-976 — Cluster-wide dynamic log adjustment for Kafka Connect

Accepted Kafka 3.7 ConnectAdmin

Adds a scope=cluster query parameter to PUT /admin/loggers/{logger} in Kafka Connect's REST API, broadcasting log-level changes to every worker in the cluster in a single request. The existing per-worker API required one request per worker, making cluster-wide log-level changes during debugging cumbersome and impossible through a load balancer.

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