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can't see metrics charts in ambari UI after ambari upgrade from 2.1.2 to 2.5.2



I have a strange issue and can't figure out why it's happening. I upgraded our ambari cluster from 2.1.2 to 2.5.2. It all went well, but now when I login to ambari UI, I do not see my Metrics charts, it says "No Data". Ambari server log shows errors like these:

05 Jul 2018 08:08:55,516 ERROR [ambari-client-thread-111684] MetricsRequestHelper:115 - Error getting timeline metrics : Read timed out
05 Jul 2018 08:08:55,518 ERROR [ambari-client-thread-111684] MetricsRequestHelper:122 - Cannot connect to collector: SocketTimeoutException for

Collector service hasn't moved, ports hasn't changed, it's all the same as it was before the upgrade.

From the same ambari server, I can see the data with curl command, for example region count report:

curl -H "Accept: application/json" ""

I have tried setting these but didn't help:


Any advice what to try next?

Many thanks!



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