@Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                          .add("endpointGroups", endpointGroups)
                          .toString();
    }
Constructs a new {@link CompositeEndpointGroup} that merges all the given {@code endpointGroups}.
core/src/main/java/com/linecorp/armeria/client/endpoint/CompositeEndpointGroup.java