add
open fun addSubscriptions(value: Service.Subscription): Service.SubscribeWithMetadataRequest.Builder
open fun addSubscriptions(index: Int, value: Service.Subscription): Service.SubscribeWithMetadataRequest.Builder
open fun addSubscriptions(builderForValue: Service.Subscription.Builder): Service.SubscribeWithMetadataRequest.Builder
open fun addSubscriptions(index: Int, builderForValue: Service.Subscription.Builder): Service.SubscribeWithMetadataRequest.Builder
repeated .notifications.v1.Subscription subscriptions = 2;