Tracking Policies

• Target tracking scaling

  • Increase or decrease the current capacity of the group based on a target value for a specific metric.

  • Very managed by ASG.

• Step scaling

  • Increase or decrease the current capacity of the group based on a set of scaling adjustments, known as step adjustments, that vary based on the size of the alarm breach.

  • Preferred to simple scaling.

• Simple scaling

  • Increase or decrease the current capacity of the group based on a single scaling adjustment.

• The primary issue with simple scaling is that after a scaling activity is started, the policy must wait for the scaling activity or health check replacement to complete and the cooldown period to expire before responding to additional alarms.

  • Cooldown periods help to prevent the initiation of additional scaling activities before the effects of previous activities are visible.