append string "System check identified %s (%s silenced)." to msg, replace first '%s' for: string "no issues",
msg += "System check identified %s (%s silenced)." % ( "no issues" if visible_issue_count == 0 else "1 issue" if visible_issue_count == 1 else "%s issues" % visible_issue_count , len ( all_issues ) - visible_issue_count , )