google_alloydb_instance: machine_type field missing in machine_config block

[trainormg]

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Description

Summary:
AlloyDB APIs recently introduced a MachineType field within the MachineConfig nested object.

Issue:
An error occurs during the creation of an instance in a replica cluster. The replica instance's MachineConfig must match the primary cluster's configuration. The API request fails due to a mismatch: the replica lacks the MachineType field, which is now required. The primary instance was created without specifying MachineType using the same Terraform provider.

New or Affected Resource(s)

• google_alloydb_instance

Potential Terraform Configuration

resource "google_alloydb_instance" "default" {
  cluster       = google_alloydb_cluster.default.name
  instance_id   = "alloydb-instance"
  instance_type = "PRIMARY"

  machine_config {
    cpu_count = 2
    machine_type = "n2-highmem-2"
  }
}

References

No response