ELB Health checks on Multiple Target Groups (multiple domains)


I am trying to utilize ELB's Host based routing  to server multple domains using the same ELB  instead of one ELB for each domain in order to reduce the cost.

Before doing that, i would like to know how the ELB health checks are going to work if i have multiple target groups.

Do i need to have a generic script (URL) on all target group's instances to validate the healthcheck?

Is it a sensible way to proceed?

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