The package icingaweb2-module-x509 1:1.2.1+dfsg-2 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/icingaweb2-module-x509 -- More information about icingaweb2-module-x509: http://pkg.kali.org/pkg/icingaweb2-module-x509