Collecting a support bundle from all the nodes in a vCenter HA cluster helps with troubleshooting.
When you collect a support bundle from the Active node in a vCenter HA cluster, the system proceeds as follows.
Collects support bundle information from the Active node itself.
Collects support bundles from Passive and Witness nodes and places them in the commands directory on the Active node support bundle.
The collection of support bundles from the Passive and Wittness nodes is a best effort and happens if the nodes are reachable.