This is a maintenance release that fixes ArgumentNullException that appears in Dashboard UI and during a call to the RedisMonitoringApi.Servers method, when BackgroundJobServer instance was resurrected. Resurrection happens when a server was removed from active servers list due to network problems, but then appeared again.

• Added – Pub/sub channel count is now reported via dashboard metrics.
• Changed – Heartbeat commands are sending with CommandFlags.HighPriority to avoid server timeouts.
• Fixed – RedisMonitoringApi.Servers method throws an exception, when server is resurrected.