Whereas org.drools.rule.Rule contains a wealth of interesting fields, the stable API org.drools.definition.rule.Rule restricts us to
getName() and getPackageName() (and some MetaData).

I propose an extension of this interface, providing access to agendaGroup, activationGroup and ruleFlowGroup. I see no obvious reason why these user defined attributes should remain hidden.

These rule attributes would provide a good opportunity for writing more sophisticated event loggers, letting you specify rule filters by natural rule groupings.