Configmap mounted as directory inside the pod. It was corresponding to statefulset where another pod worked correctly where it was mounted as file. 

On one node (`fluentd-2` pod on `control-plane2`), one of mounted config-maps is not in a valid format. `fluentd.conf` is directory, and not the file:
drwxrwxrwx. 2 root root   6 Mar 11 17:29 fluentd.conf

On the other nodes (e.g. on the `fluentd-0` pod), `fluentd.conf` is correctly mounted as a file:
-rw-r--r--. 1 root root 400 Mar 11 17:39 fluentd.conf

    4.12.49

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    Configmap mounted as directory

    Configmap should mount as file

    After restarting the pod, configmap mounted correctly as a file.