At our organization we have a large label of desktop build machines for build CI. When builds fail, we automatically send emails to perforce editors since the last successful build and to designated maintainers. Developers have the option to "checkout" a PC via Jenkins default UI to take nodes offline, and with LDAP user lookup we can identify user names. This works great because it saves build failure reproduction time, but it's not scaling well to human error - many people forget to put the node back online.

The ideal solution that I'm thinking of is to automatically email the developer that checked out the PC every N hours. So basically this plugin but notify on still checkout status every N hours and using LDAP to lookup the email address.