Auto Scaling rolling updates (CloudFormation embedded in Terraform)

asg.tf

CreationPolicy:
  AutoScalingCreationPolicy:
    MinSuccessfulInstancesPercent: 80
  ResourceSignal:
    Count: "${var.cfn_signal_count}"
    Timeout: PT10M
UpdatePolicy:
# Ignore differences in group size properties caused by scheduled actions
  AutoScalingScheduledAction:
    IgnoreUnmodifiedGroupSizeProperties: true
  AutoScalingRollingUpdate:
    MaxBatchSize: "${var.asg_max_size}"
    MinInstancesInService: "${var.asg_min_size}"
    MinSuccessfulInstancesPercent: 80
    PauseTime: PT10M
    SuspendProcesses:
      - HealthCheck
      - ReplaceUnhealthy
      - AZRebalance
      - AlarmNotification
      - ScheduledActions
    WaitOnResourceSignals: true
DeletionPolicy: Retain