* api: Added missing Raft index fields to AgentService and Node structures. [GH-2882]
* server: Fixed an issue where flood joins would not work with IPv6 addresses. [GH-2878]
* server: Fixed an issue where electing a 0.8.x leader during an upgrade would cause a panic in older servers. [GH-2889]
* server: Fixed an issue where tracking of leadership changes could become incorrect when changes occurred very rapidly. This could manifest as a panic in Autopilot, but could have caused other issues with multiple leader management routines running simultaneously. [GH-2896]