Squashed 'src/plugin/nagios/' content from commit c0edf19

git-subtree-dir: src/plugin/nagios
git-subtree-split: c0edf194b7e4f3643d35559a4c368873cd2807a5
Merge commit 'a75a37ec23ee9aa5e9ce0273fe91048dd4516535' as 'src/plugin/nagios'