So some time ago I wrote the Cluster Details marketplace plugin. Basically you drop this guy into all of your Liferay clusters and you get a nifty little control panel that tells you details about the cluster, all of the nodes which have joined the cluster and it identifies who the leader of the cluster is at the moment:
Not super complicated, but it is a handy little tool to identify details about your cluster.
Previously it was only available for Liferay 7.0, but I've just updated it for 7.0 through 7.4, CE and DXP.
Additionally, there's a new Gogo command introduced in this version. If you log into Gogo and invoke the command liferay:clusterFckd and it will dump the same info into your Gogo console.
Find version 1.1.0 in the Liferay Marketplace here: https://web.liferay.com/marketplace/-/mp/application/124517019