Application Load Balancer (ALB) and Network Load Balancer (NLB) now support Load Balancer Capacity Unit (LCU) Reservation that allows you to proactively set a minimum capacity for your load balancer, complementing its existing ability to auto-scale based on your traffic pattern.
With this feature, you can prepare for anticipated traffic surges by reserving a guaranteed minimum capacity in advance, providing customers increased scale and availability during high-demand events. LCU Reservation is ideal for scenarios such as event ticket sales, new product launches, or release of popular content. When using this feature, you pay only for the reserved LCUs and any additional usage above the reservation. You can easily configure this feature through the ELB console or API.
The feature is available for ALB in all commercial AWS Regions, including the AWS GovCloud (US) Regions and NLB in US East (N. Virginia), US East (Ohio), US West (Oregon), Asia Pacific (Hong Kong), Asia Pacific (Singapore), Asia Pacific (Sydney), Asia Pacific (Tokyo), Europe (Frankfurt), Europe (Ireland), and Europe (Stockholm). To learn more, please refer to the ALB Documentation and NLB Documentation.
Source:: Amazon AWS