code: func NewContactGroup() *ContactGroup {
  	return &ContactGroup{
  		Escalations: make([]*ContactGroupEscalation, config.NumSeverityLevels),
  		Reminders:   make([]uint, config.NumSeverityLevels),
  		Contacts: ContactGroupContacts{
  			External: []ContactGroupContactsExternal{},
  			Users:    []ContactGroupContactsUser{},
  		},
  	}
  }
docs: // NewContactGroup returns a ContactGroup (with defaults, if applicable)