The given source file is licensed under GFDL, but using a non-official text for the "no invariant sections" part.
Please ask upstream to always use (case insensitive): with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
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 23f836f. For merge requests, please use the latest version in the Lintian check cruft.