code: public final void addAllInfluencers() {
  
          // add all software systems with incoming or outgoing dependencies
          getModel().getSoftwareSystems()
                  .stream()
                  .filter(softwareSystem -> softwareSystem.hasEfferentRelationshipWith(getSoftwareSystem()) || getSoftwareSystem().hasEfferentRelationshipWith(softwareSystem))
                  .forEach(this::add);
  
          // then add all people with incoming or outgoing dependencies
          getModel().getPeople()
                  .stream()
                  .filter(person -> person.hasEfferentRelationshipWith(getSoftwareSystem()) || getSoftwareSystem().hasEfferentRelationshipWith(person))
                  .forEach(this::add);
  
          // then remove all relationships of external elements to keep the container view clean
          getRelationships()
                  .stream()
                  .map(view -> view.getRelationship())
                  .filter(relationship -> !isPartOf(relationship.getDestination(), getSoftwareSystem()) && !isPartOf(relationship.getSource(), getSoftwareSystem()))
                  .forEach(this::remove);
      }
docs: <p>Adds all {@link com.structurizr.model.Container}s of the given {@link ContainerView} as well as all external influencers, that is all
  persons and all other software systems with incoming or outgoing dependencies.</p>
  <p>Additionally, all relationships of external dependencies are omitted to keep the diagram clean</p>