GCP: Autoscaling, cool-down period and Autohealing

Autoscaling: Dynamically creates or deletes VMs to meet the instance group target. The setting of 80% means that the autoscaler will kick in when operating at 80% of the HTTP(S) Load Balancer’s balancing mode setting. This can be based on connection rate or CPU utilization.

Cool-down period: How long to wait before collecting information from a new instance. This should be at least the time it takes to initialize the instance.

Autohealing:  Allow for a health-check on each VM in the instance group. If the health-check fails, GCE will automatically attempt to restart the instance.

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