The add-log-mailing-address variable is no longer honored in debian-changelog-mode, and should not appear in packages' changelog files. Instead, put something like this in your ~/.emacs:
(setq debian-changelog-mailing-address "firstname.lastname@example.org")
The tag is present in Lintian version
That is the most recent version we know about.
We use semantic versions.
The patch number is a commit step indicator relative to the
release tag in our Git
You can find the detection logic for this version at commit ce6249d. For merge requests, please use the latest version in the Lintian check debian/changelog.