The iptables-alerter pods have been reported to exhibit high CPU usage even after upgrading the cluster to 4.18.20.

NAME                               CPU(cores)   MEMORY(bytes)   
iptables-alerter-5j6tn             10m          2Mi             
iptables-alerter-5x7wj             10m          11Mi            
iptables-alerter-bcckl             11m          41Mi            
iptables-alerter-dtfnd             11m          147Mi           
iptables-alerter-n5wtb             0m           1Mi             
iptables-alerter-sz77g             0m           1Mi             
iptables-alerter-z58zm             0m           134Mi           

    4.18.20

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High CPU usage for iptables-alerter pods.

The issue should have been resolved after upgrading the cluster to version 4.18.20.