// this will allow for gateway class to provide a default for that class rather than always forcing service or requiring users to configure correctly
		if trafficType != "" {
			if !validTrafficTypes.Contains(trafficType) {
				return nil, fmt.Errorf("invalid traffic type: %s. Valid options are: %s", trafficType, validTrafficTypes.String())
			}

## Sidecar Mode Implementation Details

Istio CNI injection is currently based on the same Pod annotations used in init-container/inject mode.

### Selection API

- plugin config "exclude namespaces" applies first
- ambient is enabled if: