This is actually an optional thing, by default it will but it can be configured to be stripped, generally not a recommended thing though because it means that whenever you want to change the iteration count or the you need to force a password reset on every existing user
I don’t think I’d make that information public were I in their shoes. Wouldn’t that be a hint for anyone attempting to crack them?
no, it’s (usually) stored as a part of the hash
This is actually an optional thing, by default it will but it can be configured to be stripped, generally not a recommended thing though because it means that whenever you want to change the iteration count or the you need to force a password reset on every existing user