Looks like the Cloud Formation templates for Enterprise 11.3 are missing some of the newer instance types, such as m6i and m7i. Is there any reason for this?
i.e. https://arcgisstore.s3.amazonaws.com/1130/templates/arcgis-server-ha.template.json
Any issue in modifying the template to include these other types?
We've run into the same circumstance (especially as time goes on w/o upgrading) and we've just created new launch template and specify a different instance type.
when I ran into this. I create the deployment using for example m5.2xlarge, then after the deployment is completed and I check that everything is working ok, I power off the machines and change the instance type.
That definitely is a convenient method if not in an autoscaling environment. You would also need to be careful about the changes to ephemeral storage drives if serving imagery using raster proxies.