VMware Cloud Foundation 9.1
In VCF 9.1, VMware Aria Operations for Logs is rebranded as Log Management and integrated as a containerized core service within the VCF Management Services Platform (VMSP). The traditional virtual machine (OVA) deployment model is no longer used.
This behavior is by design. Both VVF 9.1 and VCF 9.1 deploy VMSP by design. Deploy Log Management using the standard VMSP deployment workflow.
For details, refer Deploy Log Management