Github user Ramizjon commented on the issue:
https://github.com/apache/nifi/pull/655
@JPercivall yes, i faced some difficulties while squashing all commits into
one. Still trying to do that in valid way.
So, you have added some widgets on the dashboard and specified metrics for
them, but charts are still empty? I've tried to do the same right now, and it
works..

---
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.
---