Added cluster metrics for NetworkSender,NetworkReceiver and StateMachines
Documentation for enhanced UDC stats.
Tagging for version 2.1.0-RC2
Back to development version.
Changelog update with id reuse fix for 2.1.0-RC2
Merge pull request #2448 from benbc/2.1-more-udc-stats

Documentation for enhanced UDC stats.
Merge pull request #2439 from rickardoberg/clustermetrics

Cluster metrics