in netbench-orchestrator/src/orchestrator/cli/types.rs [164:176]
fn new(region: &str, az: String, placement: PlacementGroupConfig) -> Self {
assert!(
az.starts_with(region),
"User specified AZ: {} is not in the region: {}",
az,
region
);
HostConfig {
az,
instance_type: "c5.4xlarge".to_owned(),
placement,
}
}