Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/2124
@yuri1969 @alopresto Just wanted to chime in that technically the
Controller Services in the Controller Settings are for Reporting Tasks and
other Controller Services denied there. For instance, a Reporting Task could
reference Controller Service A and Controller Service A could reference
Controller Service B. In this case, both Controller Service A and Controller
Service B would be defined in this listing. The existing sentence that
@yuri1969 mentioned states:
> Listed services are available to all Reporting Tasks and services defined
in the Controller Settings.
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