I am trying to make etckeeper track /etc and another folder in /.

However the script 20-warn-problem-files reports many errors like

find: `./proc/7010/task/7010/fd/5': No such file or directory
find: `./proc/7010/task/7010/fd/5': No such file or directory
find: `./proc/7010/task/7010/fd/5': No such file or directory
find: `./proc/7010/task/7010/fdinfo/5': No such file or directory
find: `./proc/7010/task/7010/fdinfo/5': No such file or directory
find: `./proc/7010/task/7010/fdinfo/5': No such file or directory

Due to files in /proc being created and deleted while find is running.

I am not sure why find needs to run at all, when instead one could analyze the output of git ls-files and see if any of those files are problematic.