Gaps in monitoring diagrams of cluster

We can see on the Cluster Overview dashboard some gaps in the diagrams like SearchRate, Search Latency etc. Thanx for any help, where to look more for the details.

In the logs there is nothing really wrong, often only something like

  • on es01 node: "log.level": "INFO", "message":"[gc][10789842] overhead;
  • on es03 node: "log.level": "WARN", "message":"Received response for a request that has timed out, sent [15.8s/15807ms] ago, timed out [800ms/800ms] ago, action [indices:monitor/stats[n]], node [{es01}{WMSpJfhlT8ahPLLsWwrfVw}{-qa4cL8YRTmKU-6DYq3VSA}{}{}{cdfhilmrstw}{ml.machine_memory=1073741824, xpack.installed=true, ml.max_jvm_size=536870912}], id [73275120]", "ecs.version": "1.2.0",...

Version: 8.1.2
Nodes: 3
JVM Heap: 51.16%

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