ScalingPolicy - Amazon GameLift Service


Rule that controls how a fleet is scaled. Scaling policies are uniquely identified by the combination of name and fleet ID.



In the following list, the required parameters are described first.


Comparison operator to use when measuring a metric against the threshold value.

Type: String

Valid Values: GreaterThanOrEqualToThreshold | GreaterThanThreshold | LessThanThreshold | LessThanOrEqualToThreshold

Required: No


Length of time (in minutes) the metric must be at or beyond the threshold before a scaling event is triggered.

Type: Integer

Valid Range: Minimum value of 1.

Required: No


A unique identifier for a fleet that is associated with this scaling policy.

Type: String

Pattern: ^fleet-\S+

Required: No


Name of the Amazon GameLift-defined metric that is used to trigger a scaling adjustment. For detailed descriptions of fleet metrics, see Monitor Amazon GameLift with Amazon CloudWatch.

  • ActivatingGameSessions -- Game sessions in the process of being created.

  • ActiveGameSessions -- Game sessions that are currently running.

  • ActiveInstances -- Fleet instances that are currently running at least one game session.

  • AvailableGameSessions -- Additional game sessions that fleet could host simultaneously, given current capacity.

  • AvailablePlayerSessions -- Empty player slots in currently active game sessions. This includes game sessions that are not currently accepting players. Reserved player slots are not included.

  • CurrentPlayerSessions -- Player slots in active game sessions that are being used by a player or are reserved for a player.

  • IdleInstances -- Active instances that are currently hosting zero game sessions.

  • PercentAvailableGameSessions -- Unused percentage of the total number of game sessions that a fleet could host simultaneously, given current capacity. Use this metric for a target-based scaling policy.

  • PercentIdleInstances -- Percentage of the total number of active instances that are hosting zero game sessions.

  • QueueDepth -- Pending game session placement requests, in any queue, where the current fleet is the top-priority destination.

  • WaitTime -- Current wait time for pending game session placement requests, in any queue, where the current fleet is the top-priority destination.

Type: String

Valid Values: ActivatingGameSessions | ActiveGameSessions | ActiveInstances | AvailableGameSessions | AvailablePlayerSessions | CurrentPlayerSessions | IdleInstances | PercentAvailableGameSessions | PercentIdleInstances | QueueDepth | WaitTime

Required: No


A descriptive label that is associated with a scaling policy. Policy names do not need to be unique.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Required: No


The type of scaling policy to create. For a target-based policy, set the parameter MetricName to 'PercentAvailableGameSessions' and specify a TargetConfiguration. For a rule-based policy set the following parameters: MetricName, ComparisonOperator, Threshold, EvaluationPeriods, ScalingAdjustmentType, and ScalingAdjustment.

Type: String

Valid Values: RuleBased | TargetBased

Required: No


Amount of adjustment to make, based on the scaling adjustment type.

Type: Integer

Required: No


The type of adjustment to make to a fleet's instance count (see FleetCapacity):

  • ChangeInCapacity -- add (or subtract) the scaling adjustment value from the current instance count. Positive values scale up while negative values scale down.

  • ExactCapacity -- set the instance count to the scaling adjustment value.

  • PercentChangeInCapacity -- increase or reduce the current instance count by the scaling adjustment, read as a percentage. Positive values scale up while negative values scale down.

Type: String

Valid Values: ChangeInCapacity | ExactCapacity | PercentChangeInCapacity

Required: No


Current status of the scaling policy. The scaling policy can be in force only when in an ACTIVE status. Scaling policies can be suspended for individual fleets (see StopFleetActions; if suspended for a fleet, the policy status does not change. View a fleet's stopped actions by calling DescribeFleetCapacity.

  • ACTIVE -- The scaling policy can be used for auto-scaling a fleet.

  • UPDATE_REQUESTED -- A request to update the scaling policy has been received.

  • UPDATING -- A change is being made to the scaling policy.

  • DELETE_REQUESTED -- A request to delete the scaling policy has been received.

  • DELETING -- The scaling policy is being deleted.

  • DELETED -- The scaling policy has been deleted.

  • ERROR -- An error occurred in creating the policy. It should be removed and recreated.

Type: String


Required: No


The settings for a target-based scaling policy.

Type: TargetConfiguration object

Required: No


Metric value used to trigger a scaling event.

Type: Double

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: