[JON] some statistical metrics don't have values

Some metrics in Cache Container -> Monitoring -> Metrics tab are not updated/have value.

When the cluster is set up, the Members, Is Coordinator and Defined Cache Names metrics are always set to NaN (see the screenshot).

Update:

Also in JDG 6.x plugin there was Version trait available, which is not available in JDG 7.x plugin. I am not sure if this is a bug or a feature, so just writing it here for information.