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You may be experiencing a ramp up so fast the ALB is not scaling fast enough. Look at the following metrics:
ActiveConnectionCount
NewConnectionCount
RejectedConnectionCount
If you are using a Classic Load Balancer, Look at the following metrics:
RequestCount
SpilloverCount
SurgeQueueLength
If you see that you are not scaling fast enough, you can work with support to "pre-warm" the load balancers by filing a support ticket.
answered 2 years ago
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Could you please clarify which 5xx you saw? 502, 503, 500 or other? When 5xx error occurred, can you check if all ECS targets are healthy and reachable?