Release 1.4.4
Now the Cluster supports more than one Cluster as source.
simply add an array of clusters to your docker-compose.yaml as described here: https://github.com/int2001/DXClusterAPI/blob/4d35b3d2322ac7f982f5a4cbb1e46250d8ece590/docker-compose.yaml#L18
it'll override a single entry. Single Entry is still being used, if no cluster-array is given CLUSTER is not present.