add the default value about topics
add the default value about topics

add the default value about topics
liubog2008/heapster,andyxning/heapster,a-robinson/heapster,shilpamayanna/heapster,Huawei-PaaS/heapster,vicki-c/heapster,huangyuqi/heapster,titilambert/heapster,piosz/heapster,aegixx/heapster,luxas/heapster,skytap/heapster,saiwl/heapster,wulonghui/heapster,liubog2008/heapster,shilpamayanna/heapster,wulonghui/heapster,aegixx/heapster,mwringe/heapster,burmanm/heapster,andyxning/heapster,bluebreezecf/heapster,jackzampolin/heapster,mwielgus/heapster,huangyuqi/heapster,burmanm/heapster,krzyzacy/heapster,saiwl/heapster,krzyzacy/heapster,skytap/heapster,titilambert/heapster,bruceauyeung/heapster,AlmogBaku/heapster,adfin/statster,AlmogBaku/heapster,a-robinson/heapster,Stackdriver/heapster,taimir/heapster,whuwxl/heapster,whuwxl/heapster,Stackdriver/heapster,johanneswuerbach/heapster,mwielgus/heapster,bruceauyeung/heapster,johanneswuerbach/heapster,adfin/statster,Huawei-PaaS/heapster,bluebreezecf/heapster,jackzampolin/heapster,vicki-c/heapster,piosz/heapster,luxas/heapster,taimir/heapster,mwringe/heapster