Queryable state deactivated on current master branch

[Stefan Richter]

Hi,

I want to announce that the queryable state feature is deactivated on the current master. In our efforts to implement dynamic scaling for Flink, we introduced key-groups for keyed state (see [FLINK-3755]). However, queryable state does not support key-groups, yet. We will reactivate the feature as soon as we have finished our followup work on key-group aware queryable state.

Regards,
Stefan