Function scaleway_api_rs::apis::read_replicas_api::create_read_replica

pub async fn create_read_replica(
    configuration: &Configuration,
    region: &str,
    create_read_replica_request: CreateReadReplicaRequest
) -> Result<ScalewayPeriodRdbPeriodV1PeriodReadReplica, Error<CreateReadReplicaError>>

You can only create a maximum of 3 read replicas for one instance.