Previous stable version was 4.4.x (released on March, 2016), see what was new in that release at:
This is a draft of new features added in v5.0.x, manually updated, thus not always synchronized with what is new in source code repository.
* max_subscribes parameter - this limits the number of subscriptions per IMPU, watcher URI and event combination * add param max_notification list size and stat of current size
New global parameter to specify the config engine:
kamctl rpc jsonrpc.echo abc 123 kamctl rpc jsonrpc.echo s:abc i:123 kamctl rpc jsonrpc.echo s:888 i:123 kamctl rpc core.version