The DX NetOps Virtual Network Assurance (VNA) documentation defines the "VMANAGE_IP" setting as:
VMANAGE_IP
Specifies the IP address of the vManage host.
Can you use a hostname for the VMANAGE_IP setting instead of an IP address?
DX Netops Virtual Network Assurance
Yes, VMANAGE_IP cn be an IP address, hostname, or URL