Changes between 4.4.1 and 4.4.2.RC1

This is a pre-release for 4.4.2, a patch pre-release that fixes a bug that can occur when using metrics in combination with automatic recovery. All users of the 4.x.x series are encouraged to test this pre-release.

Fix metrics for acked/nacked/rejected messages after automatic recovery has kicked in

The metrics are correct and delivery tags no longer leak in the metrics implementation.

GitHub issue: #339