Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/1872
@markap14 - Counters are currently protected in access policies using a
global resource. This is due to the fact that there are instance based Counters
and a corresponding type based Counter. The type base Counters aggregate the
values from all instances of that type reporting that Counter. Because type
based Counters lose the association to the underlying instance, we are
currently requiring a global permission.
Access to stats and status history is available to any user with
permissions to the UI (protected in access policies with the /flow resource).
Because of this, I think we need to filter only allowable Counters into the
status history. We will need to decide what is allowable in this context.
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