When uninstall Microsoft.Azure.Diagnostics.IaaSDiagnostics delete WAD0107\Tables directory
we were dealing with missing metrics in extended diagnostics. Based recommendation of page https://docs.microsoft.com/en-us/azure/monitoring-and-diagnostics/azure-diagnostics-troubleshooting we reinstalled the agent, but it didn't lead to the correction. The Metric was created in Azure portal, but the Storage account table persists empty.
The correction of the issue was:
1) Uninstall the monitoring agent
2) delete the directory
and redeploy the Diagnostics agent. (22.214.171.124 version may differ, The latest one). If this didn't help, than delete all directory C:\WindowsAzure\Logs\Plugins\Microsoft.Azure.Diagnostics.IaaSDiagnostics.
3) Install again the monitoring agent.
I would recommend to include the deletion of the directory into the uninstall procedure.