Unable to see the historical metrics when an agent is offline and using Webview.
Cause:
It could be that you need to change the "ShowHide Grayed-out Metrics"
Environment:
10.7
Resolution:
You may need to Mount the Agent. When the agent is showing and still grayed out, then Right Click on the Agent Node in the metric browser and click the "ShowHide Grayed-out Metrics" button. Then you will be able to see the metrics.