we solved this issue by checking in oracle credentials under "Non-root account":
Elevate specified account to root
Add account to sudoers file automatically
After running the job you will notice that the next 2 lines are added to "/etc/sudoers" file:
oracle ALL=(root) NOPASSWD: ALL
Later, there will not be more warnings and it is safe to uncheck the option "Add account to sudoers file automatically".
Hope this will help