Keeping track of the plugins installed on your WordPress Multisite can be hard since. Does site A use the same plugin that site B uses? Well what about site D, does it use any plugins at all? How do I keep track of the plugins that each site uses in a source control like Git?
I gave a presentation at the WordPress Baltimore 2016 titled Managing WordPress Dependencies in Single and Multisite Environments to help shed some light on of several ways to do this. Take a look and hopefully you find it helpful.