Here is a good article on how long canned food can last and the warning signs that it has gone bad.
http://www.shtfplan.com/headline-news/everything-you-want-and-need-to-know-about-long-term-canned-food-storage-plus-10-signs-of-spoilage_08242018
I found this article and thought I would share with fellow Preppers.
http://www.shtfplan.com/headline-news/99-relatable-things-that-only-preppers-will-understand_07202018