Lost Requests for api EC2 with ALB

Question

I have api EC2 server and Application Load Balancer.
In ALB make Deregistration delay (draining interval): 300 Seconds.
And I have issue in api and lost requests. Is this the cause?

Answer

Hello.

Deregistration delay is a parameter that specifies the period during which new requests will not be accepted when an instance is removed from a target group.  
Therefore, it is unlikely that requests will be terminated even if this setting value is changed.  
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-target-groups.html#deregistration-delay

Is it possible that the ALB timeout is related?  
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/application-load-balancers.html#load-balancer-attributes

Lost Requests for api EC2 with ALB

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