Autoscaling in APM Insight

How is auto scaling handled by the APM Insight agent?

When applications are scaling up, a request for creating a new instance comes from the agent. Depending upon the license availability, the new instance may be scaled up for monitoring. 

Let's say your license limit allows you to monitor 3 advanced monitors. The following table illustrates the various scenarios w.r.t autoscaling in APM Insight:


Case
Active instance
Auto-suspended instance
Autoscale scenario
1.
All three instances are active.
None
In this case, a new instance will not be spawned for autoscaling since your license limit is already consumed completely.
2.
Two instances are active

One instance is auto-suspended because of scaling down
Here, the auto-suspended instance will be reactivated.
3.
One instance is active
One instance is auto-suspended because of scaling down
The auto-suspended instance will be reactivated. After autoscaling, you can accommodate one more active instance in this scenario.

Note: When the instance is in down state for more than 5 minutes, it is automatically marked as Suspended. In case, if you had manually suspended your application, even when a new instance spans, it will still be in suspended state, unless changed manually. 

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