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- autoscaler_task_interval (t)
The time period between two iterations of an ‘autoscaling decision making’ task. You are advised to consider the time ‘that a service instance takes to join ELB’ when configuring this value. This is in milliseconds and the default value is 30000ms. - max_requests_per_second (Rps)
The number of requests, a service instance can withstand per a second. It is recommended to calibrate this value for each service instance and if needed for different scenarios. Load testing a similar service instance is an ideal way to estimate the value.The default value is 100. - rounds_to_average (r)
An autoscaling decision will be made only after this many iterations of ‘autoscaling decision making’ tasks. The default value is 10. - alarming_upper_rate (AUR)
The upper bound of the alarming rate that provides a hint on when to scale up the system. We scale the system up when it reaches the request capacity that corresponds to alarming_upper_rate, without waiting till the service instance reach its maximum request capacity. Thealarming_upper_rateis 1.This value should be 0<AUR<=1 and default is 0.7. - alarming_lower_rate (ALR)
This is the lower bound of the alarming rate that provides a hint on when to scale down the system. This value should be 0<ALR<=1 and default is 0.2. - scale_down_factor (SDF)
This factor is needed to make the scaling down process slow. Scaling down needs to be done slowly to reduce scaling down due to a false-positive events. This value should be 0<SDF<=1 and default is 0.25.
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