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This uses the 'replacement' service slot introduced in the Shepherd version 0.5.0. * gnu/services/shepherd.scm (shepherd-service-upgrade): Return a list of services that need to be restarted to complete their upgrade. * guix/scripts/system.scm (call-with-service-upgrade-info): Rename an internal variable to reflect the change to shepherd-service-upgrade. (upgrade-shepherd-services): Call 'load-services/safe' instead of 'load-services'. Print a message about services that need to be manually restarted. * gnu/services/herd.scm (load-services/safe): New procedure. * doc/guix.texi (Invoking guix system): Document the new behaviour. Co-authored-by: Ludovic Courtès <ludo@gnu.org>