disallow devise paths in robots.txt ?

I see bots crawling devise pages in my log:
141.8.143.179 - - [06/Oct/2018:00:35:45 -0400] “GET /users/sign_in HTTP/1.1” 200 4022 “-” “Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)”

Should I disallow those paths in robots.txt ?

1) why?

2) do your logs show these bots *reading* robots.txt?

Yes