Preview: The instance flexibility policy of a managed instance group (MIG)

## Feature Feature **Preview**: The instance flexibility policy of a managed instance group (MIG) lets you override the minimum CPU platform and disk definition that is specified in the MIG's instance template. With these overrides, you can select machine types that run on different CPU platforms and that have different architectures. For more information, see [About instance flexibility in MIGs](https://cloud.google.com/compute/docs/instance-groups/about-instance-flexibility#overrides-for-instance-properties).