This is a recurring question, take all the advice here with a grain of salt.

Send an email to the hiring department(s) and ask them. When I applied about 4 years ago, Delta said they wanted to know about all failures (UPT daily rides, UPT checks rides, etc) in the addendum, United said only Form 8 busts. I answered their questions accordingly. They never came up in the Delta interview, but I was ready to talk about them if they did. At Delta at least back then, my app wasn't automatically eliminated by answering "yes" to the question about training failures.

Be able to defend anything you put, or don't put, on your app.

Good luck.