In DevTest Portal, under Reporting, VSE Metrics, when selecting Virtual Response Time and specifying a time range, no chart is being created.
If a different time range is specified, the chart is generated.
The VSE collects the metrics details in memory and then write out the details to the database configured with the Registry.
For the VSE Metrics, the following tables are verified:
All supported releases of DevTest.
The site.properties file holds the database configuration.
There were two connection strings enabled on the site.properties file.
After the incorrect connection string was commented out and DevTest components were restarted, the VSE Metrics Reports were available.
More information regarding Virtual Service Metrics Reports: