The symbol definition refers to an alternative dependency template which is not defined for the library containing the symbol.
The first alternative dependency template for a library the id number of 1, with the ids of subsequent alternative templates increasing in sequence.
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 43a81d7. For merge requests, please use the latest version in the Lintian check debian/shlibs.