Description of problem:


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


How reproducible:


Steps to Reproduce:
1. Display chart for several metrics 
2.Click redraw several times
3.

Actual results:
Sometimes some charts are empty with text "No metric data available" despite these charts were OK a seconds ago. If click redraw again, these charts are OK, but another ones are empty.
- Some charts may have a pink background after redraw. It becomes white after the next redraw
- Some charts may have the same content whereas corresponding metrics values differ

Expected results:
Selected metrics are charted separately. All charts are not empty (measurements data for selected metrics must exist, of course).
Charts don't change when redrawing them (the only change may be a new data collected and displayed)

Additional info: