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1. We will add a deprecated annotation on `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC`.
2. Add new `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC_NAME` which `metricName` is `kafka.server:type=AssignmentsManager`  and add it to `AssignmentsManager#metricsRegistry`.
3. Delete `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC` at the next major release and remove it from `AssignmentsManager#metricsRegistry`.

Test Plan

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• We should add new test for new metrics works expected as deprecated test.

Rejected Alternatives

n/a