Description of problem:
Metric values in Resource:Measurements and Group:Metrics portlets are not properly refreshed.

Version-Release number of selected component (if applicable):
RHQ 4.12

How reproducible:
Always

Steps to Reproduce:
1. Install RHQ 4.12 + EAP Plugins;
2. Navigate to RHQ UI -> Administration -> Metric Collection Templates -> JBossAS7 Standalone Server -> edit metric collection to set "Maximum Request Time" metric to 30 seconds;
3. Open two sessions of RHQ UI in the browser;
4. In the first one navigate to AutoGroup - JBossAS7 Standalone Servers -> Summary -> Activity and observe "Maximum Request Time" metric value;
5. In the second window navigate to the same AutoGroup - JBossAS7 Standalone Servers -> click on "Maximum Request Time" name/link -> click on 4h -> click on 1 h -> close this window;
6. Observe the value for "Maximum Request Time" - most likely it's changed;
7. Go back to the first window and confirm that initial value is not changed.
8. Press little refresh button in the right corner of the portlet and confirm that the value is not changed;
9. Request browser refresh -> confirm that metric value is changed.

Actual results:
Metric values are not refreshed in timely manner;

Expected results:
Metric values are regularly refreshed/updated;

Additional info: