Feature Request: Tenant inheritance from Cluster to Virtual Machines and IP Addresses #531

First of all, thank you for the excellent project.

We are using netbox-sync to synchronize VMware objects into NetBox and recently started using the cluster_tenant_relation option, which was introduced through issue #110:
#110

This feature works as expected and correctly assigns tenants to clusters.

However, we have encountered a limitation: tenant assignment is not inherited from the Cluster object to Virtual Machines and their IP addresses.

Current behavior:

• Cluster receives the correct tenant via cluster_tenant_relation.
• VMs within that cluster remain without a tenant.
• IP addresses assigned to those VMs also remain without a tenant.
• Additional vm_tenant_relation rules must be created and maintained separately.

In our environment, tenant ownership is determined by the VMware cluster, not by individual VM names.

Example:

Production-Cluster -> Production Tenant
Test-Cluster -> Test Tenant

All VMs and their IP addresses within a cluster should belong to the same tenant.

The main challenge is that vm_tenant_relation works on VM-based matching. In environments with many VMs, maintaining large sets of VM name regex rules becomes difficult and duplicates information that is already defined by cluster_tenant_relation.

Suggested enhancement:

Implement tenant inheritance:

Cluster Tenant
↓
VM Tenant
↓
IP Address Tenant

Proposed behavior:

1. If a VM does not match an explicit vm_tenant_relation, inherit the tenant from its parent cluster.
2. If an IP address belongs to a VM, inherit the tenant from the VM.
3. Explicit mappings should continue to have priority over inherited values.

Benefits:

• Significantly simpler configuration.
• No need to maintain large VM name-based tenant mappings.
• Tenant information would be defined only once at the cluster level.
• Consistent tenant assignment across clusters, VMs and IP addresses.
• Solves the common use case where tenant ownership is organized by VMware clusters.

From our perspective, tenant inheritance would fully complement the functionality introduced by cluster_tenant_relation in issue #110 and would solve almost all tenant assignment use cases in VMware environments.

Thank you for considering this enhancement.