Lintian tag information: priority-extra-is-replaced-by-priority-optional (type: warning)
Description (from lintian-explain-tags)
Since Debian Policy version 4.0.1, the priority extra has been deprecated. Please update debian/control and replace all instances of Priority: extra with Priority: optional. Please refer to Priorities (Section 2.5) in the Debian Policy Manual for details. Visibility: warning Show-Always: no Check: fields/priority