void createHostSet(int priority, UpdateHostsParam params) {
            final HostSet hostSet = new HostSet(params, clusterLoadAssignment);
            hostSetsBuilder.put(priority, hostSet);
        }
Returns the original list of endpoints this priority set was created with.
This method acts as a temporary measure to keep backwards compatibility with
{@link SubsetLoadBalancer}. It will be removed once {@link SubsetLoadBalancer}
is fully implemented.
xds/src/main/java/com/linecorp/armeria/xds/client/endpoint/PrioritySet.java