*`group` - (Required) The name or URI of a Compute Engine instance group (`google_compute_instance_group_manager.xyz.instance_group`) that can receive traffic.
*`balancing_mode` - (Optional) Defines the strategy for balancing load. Defaults to `UTILIZATION`
*`capacity_scaler` - (Optional) A float in the range [0, 1.0] that scales the maximum parameters for the group (e.g., max rate). A value of 0.0 will cause no requests to be sent to the group (i.e., it adds the group in a drained state). The default is 1.0.
*`description` - (Optional) Textual description for the backend.
*`max_rate` - (Optional) Maximum requests per second (RPS) that the group can handle.
*`max_rate_per_instance` - (Optional) The maximum per-instance requests per second (RPS).
*`max_utilization` - (Optional) The target CPU utilization for the group as a float in the range [0.0, 1.0]. This flag can only be provided when the balancing mode is `UTILIZATION`. Defaults to `0.8`.