We would like to add the following note to the documentation for commatrix plugin:
Note: The communication matrix relies on EndpointSlices to discover exposed ports. EndpointSlices are automatically created by Kubernetes for each Service. All core OpenShift ports are fully covered by the matrix from OpenShift 4.21 release. However, non-core operators that do not expose a Service will not appear in the matrix.
For a full picture of the cluster’s listening ports (as seen via ss), please use the --host-open-ports flag to capture the actual open ports on the nodes. You can also compare this output with the declared ports using the generated diff file, which shows differences between intended and actual state