Checkmk Werk 14393: Warn about User IDs that become incompatible in 2.2.0

ID: 14393 Title: Warn about User IDs that become incompatible in 2.2.0 Component: Setup Level: 1 Class: New feature Version: 2.2.0i1 Beginning with Checkmk version 2.2.0, the use of certain special characters in user IDs will no longer be allowed. As a result, some user IDs that were previously valid in Checkmk version 2.1.0 will become invalid in version 2.2.0. This will affect both local users and users from external connections such as LDAP. With this Werk you will be warned about users that will become incompatible in the future. When you run the `omd update` command, it display a warning message including the list of affected users. Moreover, the Setup > Users page in WATO it will also display a warning message if incompatible user IDs are found. To be compatible with Checkmk version 2.2.0 please ensure that all user IDs adhere to the following restrictions: The first character of a user ID must be a digit, an ASCII letter, an underscore (<tt>_</tt>), or a dollar sign (<tt>$</tt>). The rest of the user ID may additionally contain dash (<tt>-</tt>), at (<tt>@</tt>), and dot (<tt>.</tt>). (In addition to ASCII letters, some umlauts continue to be permitted). If you require certain characters that would no longer be allowed and changing user IDs is not feasible in your system, please contact Checkmk support for assistance.