Fluent::Plugin::ConcatFilter::TimeoutError in OpenShift

Issue

• Some logs getting Fluent::Plugin::ConcatFilter::TimeoutError and not transferred to a log store in OpenShift

  fluentd-xxxxx fluentd 2021-04-30 00:39:30 +0000 [warn]: dump an error event: error_class=Fluent::Plugin::ConcatFilter::TimeoutError error="Timeout flush: kubernetes.var.log.containers.kube-apiserver-master0_openshift-kube-apiserver_setup-6b3f927b2eed3b0ff1325bd0b870520e2aa6c36f2cbec3f5ba9e82ee2267a0df.log:default" location=nil tag="kubernetes.var.log.containers.kube-apiserver-master0_openshift-kube-apiserver_setup-6b3f927b2eed3b0ff1325bd0b870520e2aa6c36f2cbec3f5ba9e82ee2267a0df.log" time=2021-04-30 00:39:30.697017563 +0000 record={"time"=>"2021-04-27T00:23:03.001599173+00:00", "stream"=>"stdout", "logtag"=>"P", "log"=>"Fixing audit permissions.Waiting for port :6443 and :6080 to be released.......................................................................................Fixing audit permissions.Waiting for port :6443 and :6080 to be released.Fixing audit permissions.Waiting for port :6443 and :6080 to be released."}