Logstash 5.0.0-beta1 has been released yesterday. The Monitoring API has been cleaned up some more and a few additional fixes are in the pipe.
This release includes the handling of some additional data in the /_node/stats/jvm and /_node/stats/pipeline endpoints.
Check out the latest release of logstashbeat at: https://github.com/consulthys/logstashbeat
The next release should include additional fields for some specific logstash input, like jdbc, tcp, redis, etc. Stay tuned...