metrics do not show

[xiang . dai]

Hi! 

I build 2.6.1 ambari server and agent following docs. 

Then I succeed in installing zookeeper and ambari-metrics, and metrics in 
dashborad looks very good. 

But i find that metrics in AMBARI-METRICS and metrics in hosts can not show. 

I check the log but do not find error. 

Did i miss something import? 

Could someone help me? 

Thanks