add axis labels to task age histogram in /runningprodtasks/ page
add axis labels to task age histogram in /runningprodtasks/ page

Foorth/panda-bigmon-core,tkorchug/panda-bigmon-core,PanDAWMS/panda-bigmon-core,Foorth/panda-bigmon-core,PanDAWMS/panda-bigmon-core,PanDAWMS/panda-bigmon-core,Foorth/panda-bigmon-core,PanDAWMS/panda-bigmon-core,tkorchug/panda-bigmon-core,tkorchug/panda-bigmon-core