Add support for configurable SMT to GCE Instance (beta)

[rileykarson]

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Description

I can't find public cloud docs yet, but the feature has entered public preview.

New or Affected Resource(s)

• google_compute_instance
• possibly google_compute_instance_template

Potential Terraform Configuration

# Propose what you think the configuration to take advantage of this feature should look like.
# We may not use it verbatim, but it's helpful in understanding your intent.
...
  advanced_machine_features {
    threads_per_core = 1 # note: default 2
  }
...

References

• b/185995659

[github-actions]

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