Mastering Development System & Network

Do we need conntrack for Load Balancer server?

I have 3 private dedicated server as Load balancer. And then there is IP Addr Public sign to this private dedicated server.
Suddenly, one of these 3 LB servers got nf_conntrack: table full, dropping packet

My dedicated server spec is 32 Core; 256 GB.
I read some nf_conntrack and finally i am planning to increase the conntrack_max to about 4 millions.
But i need a more recommendation from you all who have experience and expert in Server Performance.

When do we need conntrack ? Meanwhile, this is dedicated server with private ip not a NAT gateway.
Should i remove conntrack ?

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