Matt Gilman created NIFI-4280:

             Summary: UI - Support configuring variables at a Process Group 
                 Key: NIFI-4280
             Project: Apache NiFi
          Issue Type: New Feature
          Components: Core UI
            Reporter: Matt Gilman
            Assignee: Matt Gilman

Add support for configuring variables at a Process Group level. Variables, like 
Controller Services, are scoped by the group they are defined in and are 
available to any Processor defined there and below (ie and descendant 
Processors). Variables in a descendant group can override the value in a parent 
group. Variable permissions will be based solely on the corresponding Process 

Because variables are specified in EL, there is no controlling access to them 
like Controller Services which can be restricted using the combo selector. 
Because of this, variables should not be used for sensitive values.

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