I added Vmware Esxi ip in OpenNMS and configured SNMP for the same. After successful addition of node, I also added Configuration in /usr/share/opennms/etc/vmware-config.xml ( I am running OpenNMS in Ubuntu 20.04 ) for monitoring of Vmware Esxi using Vmware Monitor. Below is the configuration of vmware-config.xml
<?xml version="1.0"?>
<vmware-config>
<vmware-server hostname="<ip_address_of_vmware_esxi>" username="vmware_username" password="vmware_password"/>
</vmware-config>