Reduce verberos logs

When the server maintenances a large number of replicas (say 2000), it produce too many verberos logs, the INFO level logs will be rotate very soon. Since most of them are not necessary, we can lower some log levels.

Start by locating the server maintenance log statements responsible for the excessive INFO-level output when managing many replicas. Identify which messages are unnecessary and verify that lowering their levels reduces log volume without hiding important maintenance information.

Written by the indexing model from the issue text.