After having deployed the VNA ACI Plugin can only see a few subset of ACI Spine/Leaf in the VNA Inventory under Spectrum Universe.
Release : 3.7.x
Component : Virtual Network Assurance For CA Performance Management
The devices needs to be SNMP discoverable in Spectrum to be created from VNA into Spectrum Universe.
Spectrum does not model ACI Spine/Leaf switches if they are not SNMP reachable.
VNA Inventory container holds the VNA Integration SNMP models. If there is no model placed under this container, it will be in the initial state, which is expected.
The ACI devices like spine/leaf switches should show up under the VNA Inventory container and POD when integration is enabled.