If Poudriere is happy (as you've noted) ship it

USES= tar:bzip2 in Makefile is incorrect

Fix that line and you're good to go

LGTM

You're right about blake3, sorry for the noise about that one.

Have you done any runtime testing and if so one what platform and OS version?

A few other switches that needs to be looked at:
BUILD_TESTING:BOOL=ON
Can we enable unit tests? Should be disabled otherwise

LGTM otherwise

If vendor supplied sqlite3 isn't used use this method to prevent unnecessary I/O
https://cgit.freebsd.org/ports/tree/net-mgmt/netdata/Makefile#n33

libtool localbase in USES= also seems incorrect given the rest of the port or is localbase required for pkgconfig?

While not mandatory I'd recommend that you try to move over to DISTVERSION to follow Porters Handbook whenever possible.
https://docs.freebsd.org/en/books/porters-handbook/book/#makefile-versions

Friendly ping

Fair enough, please address what @bofh mentioned first.

Remember to reference Phabricator review properly and Approved by in commit massage. See https://docs.freebsd.org/en/articles/committers-guide/

In general I'm not in favour of re-rolling our own dist files because it mainly relies on a single person and that person wont be around forever or will always be available and it's most more convenient to use the same tarball as everyone else in terms of availability.

Poudriere reports:

Error: mail/py-flask-mailman depends on nonexistent origin 'textproc/py-mkdocs-include-markdown-plugin'; Please contact maintainer of the port to fix this.

LGTM, just check that it's not referenced in ./Mk

Works with both DOCS off and on?
I would argue that we shouldn't install fonts for non font ports