The node responding.
The highest slot this node has accepted a message. Used by a new leader during the leader takeover protocol to expand the range of slots it is recovering.
The last seen leader heartbeat. Used to detect a working leader behind a partial network partition to prevent unnecessary leader failover attempts.
The high commit mark and high promise mark of the responding node.
The identifier of the Prepare message being acknowledged.
Negatively acknowledge a Prepare message. See PrepareResponse