The package is severely out of date with respect to the Debian
Policy. Latest version is 4.6.2
and your package only follows
3.9.6...
The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In debian/watch no matching files for watch line https://github.com/Azure/WALinuxAgent/releases /Azure/WALinuxAgent/archive/WALinuxAgent-([\d\.]+)\.tar\.gz debian uupdate