Null response for api/cluster


I have some issues with cluster health and stats display in gui, sometimes i get null responses like here:

Graylog 2.5.1+34194da on graylog4 (Oracle Corporation 1.8.0_161 on Linux 3.10.0-693.11.6.el7.x86_64)

5 nodes of graylog + 7 es

no errors in rest access log no errors in server log, everything behind loadbalancer

looks like a problem with certificates in java trust store for new added nodes, no sign in logs tho. updating store solved problem.

Important stuff to keep track of, for sure!

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