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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
A "leader election" mechanism is removed from
ReplicatedMergeTree, because multiple leaders are supported since 20.6. If you are upgrading from older version and some replica with old version is a leader, then server will fail to start after upgrade. Stop replicas with old version to make new version start. After that it will not be possible to downgrade to version older than 20.6