Auto-scaling Policy Resource Definition

An auto-scaling policy defines the threshold values pertaining to scaling up and scaling down decisions. Autoscaler will refer to the auto-scaling policy that is defined by DevOps. A sample auto-scaling policy definition, together with information on all the properties that can be added in an auto-scaling policy definition JSON are as follows:

Sample auto-scaling policy definition JSON

The following are sample configurations that can be used to define an auto-scaling policy:

{
  "id": "autoscaling-policy-1",
  "loadThresholds": {
    "requestsInFlight": {
      "threshold": 50
    },
    "memoryConsumption": {
      "threshold": 40
    },
    "loadAverage": {
      "threshold": 40
    }
  }
}

Property definitions

All the properties that correspond to the auto-scaling resource are explained as follows:

id
displayName
description
loadThresholds
- requestsInFlight
  - threshold
- memoryConsumption
  - threshold
- loadAverage
  - threshold

Main property definitions

Property				Description			Data Type	Example
JSON	UI			Description			Data Type	Example
`id`	Auto Scale policy ID	√	√	Unique ID of the autoscaling policy	Yes	N/A	String	economy
`displayName`		√	√		No	N/A	String
`description`	Description	√	√	A summarized description of the auto-scaling policy	No	N/A	String	Values for economy auto-scaling policy.
`loadThresholds`	Load Thresholds	√	√	The autoscaling load threshold is determined based on the requests in flight, memory consumption, and load average. For more information on the sub-properties, see loadThresholds.	Yes	N/A	LoadThresholds	N/A

Sub-property definitions

loadThresholds

Property				Description			Data Type
JSON	UI			Description			Data Type
`requestsInFlight`	Requests In Flight	√	√	The number of requests the load balancer received, but are yet to be processed. For more information on the sub-properties, see requestsInFlight. This property is only required if the deployed cartridge is using a load balancer.	No	N/A	requestsInFlight
`memoryConsumption`	Memory Consumption	√	√	The memory usage of a cartridge process, which is considered as a percentage of the total available RAM. This is a percentage and cannot go beyond 100, since a process cannot take more than total physical memory. For more information on the sub-properties, see memoryConsumption. The formula used to calculate this is: `((usedMemory - cachedMemory)/totalMemory)*100` In the above formula, `usedMemory` refers to the amount of current memory usage, `cachedMemory` refers to the amount of memory available in the Cache and `totalMemory` refers to the total amount of memory available in the instance used.	Yes	N/A	memoryConsumption
`loadAverage`	Load Average	√	√	The average system load over a period of time. (System load is a measure of the amount of computational work that a computer system performs.) This a percentage and it can go beyond 100%. For more information on the sub-properties, see loadAverage. The formula used to calculate this is: `(loadAvg/cores)*100` In the above formula, `loadAvg` refers to the load average of the instance and `cores` refers to the number of CPU cores of the instance.	Yes	N/A	loadAverage

requestsInFlight

Property					Description			Data Type	Example
JSON	UI				Description			Data Type	Example
`threshold`	Threshold	√	√		The maximum requests in-flight limit.	No	N/A	Float	30

memoryConsumption

Property					Description			Data type	Example
JSON	UI				Description			Data type	Example
`threshold`	Threshold	√	√		The maximum memory usage limit.	No	N/A	Float	80

loadAverage

Property					Description			Data Type	Example
JSON	UI				Description			Data Type	Example
`threshold`	Threshold	√	√		The maximum limit of an average system load over a period of time.	Yes	N/A	Float	100