[security risk]: Pupose of _salt file under the vault-data/auth/<random key>/_salt

Hi,

I would like to understand the purpose of the vault-data/auth/<random key>/_salt and vault-data/sys/_salt file. It has been flagged as a security risk due to containing plain text data. What would be the impact of removing this file? Additionally, I noticed that even if I delete it, the file is automatically regenerated after some time.

Your insights on this matter would be greatly appreciated.