Looks like no update in LEM 6.2 (current release). The ability to poll the appliance via SNMP is possible, but this would result in countless support cases and remote sessions with SolarWinds support to login as root and configure smnpd.conf with your desired community string and permitted managers (if this service has not been removed from the OS build). If you are getting CPU alarms triggered in vSphere, check why your appliance is running hot. This can be down to number of log sources, bad syslog configuration (multiple syslog sources from different vendors to same facility level, badly formed rules or out of the box rules not tuned/disabled, no noise filtering applied.
The 2 vCPU, 8GB Memory configuration should suffice for most instances and it is key to make sure that the LEM Manager is properly configured, as per above hints. If you have a large quantity of events per minute, high node count (250+), it may be worthwhile reviewing if a 4vCPU configuration would be of benefit, but review your setup first before throwing more resource at the issue.