Setting up OMS Capacity and Performance
Do you know what your HyperV hosts are doing?
Not a HyperV fan, there's a VMWare solution also here
Documentation /en-us/azure/log-analytics/log-analytics-capacity
Capacity dashboard
Details
Troubleshooting dashboard
Firewall /en-us/azure/log-analytics/log-analytics-proxy-firewall
Windows Agents /en-us/azure/log-analytics/log-analytics-windows-agents
Verify in Operations Manager if you have any error events
Event ID 4506 in this case is the Capacity and Performance Solution
Verify no proxy is set up (unless your network requires this)