New Features and Improvements:

• Complete overhaul of messaging channel API (breaking changes)
• Support send and broadcast operations with acknowledgements
• Better error reporting for messaging/rpc
• Add 'prepare' and 'complete' phases to coordination process

Breaking changes:

Messaging Service

• Messaging channel now provides builder-style API for constructing message operations:
  • MessagingChannel#newSend()
  • MessagingChannel#newRequest()
  • MessagingChannel#newSubscribe()
  • MessagingChannel#newBroadcast()
  • MessagingChannel#newAggregate()
• Rename MessagingChannel#stream(...) to subscribe(...)
• Rename Message#get() to payload()
• MessageBase#from() now returns ClusterNodeAddress instead of ClusterNodeId
• Refactoring of message interceptor API (separate interfaces for client and server interceptors)

Metrics Service

• Switch to Micrometer for internal metrics gathering and reporting
• Dropped hekate-metrics-influxdb,hekate-metrics-cloudwatch and hekate-metrics-cloudwatch modules

Dependency Upgrades:

• All dependencies aligned with Spring Boot BOM 2.0.8.RELEASE
• Upgraded to Kubernetes Client 4.1.3
• Upgraded to JClouds 2.1.2