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issue: #38142 current balance channel policy only consider current collection's distribution, so if all collections has 1 channel, and all channels has been loaded on same querynode, after querynode num increase, balance channel won't be triggered. This PR enable score based balance channel policy, to achieve: 1. distribute all channels evenly across multiple querynodes 2. distribute each collection's channel evenly across multiple querynodes. --------- Signed-off-by: Wei Liu <wei.liu@zilliz.com>