Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/858
As you can see the KEY group is documented within NiFi code but the UI
lacks such explanation
https://github.com/apache/nifi/pull/858/files#diff-d13cbfd36645869513f9d09b76636240R183
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
