How to attach correct alert monitor with AWS Instances

How to attach correct alert monitor with AWS Instances

Hi,

We are planning to migrate Datadog to site24x7. We have the following queries.

1. As in our environment, With the new release, we spin up new servers and teardown old servers. So who the monitors and threshold can be attached automatically. 

2. how we can filter and separate the resources  according to the environment 

Thanks 
Ashwani Singh