Changes between 5.1.1 and 5.1.2.RC2

This is a pre-release for 5.1.2, a patch pre-release that fixes a bug that can occur when using metrics in combination with automatic recovery. All users of the 5.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

Support tags in Micrometer metrics collector

GitHub issue: #342

Upgrade Micrometer to 1.0.0-rc.6

GitHub issue: #340