private com.google.protobuf.RepeatedFieldBuilderV3<
              com.google.cloud.vertexai.api.SlackSource.SlackChannels.SlackChannel,
              com.google.cloud.vertexai.api.SlackSource.SlackChannels.SlackChannel.Builder,
              com.google.cloud.vertexai.api.SlackSource.SlackChannels.SlackChannelOrBuilder>
          getChannelsFieldBuilder() {
        if (channelsBuilder_ == null) {
          channelsBuilder_ =
              new com.google.protobuf.RepeatedFieldBuilderV3<
                  com.google.cloud.vertexai.api.SlackSource.SlackChannels.SlackChannel,
                  com.google.cloud.vertexai.api.SlackSource.SlackChannels.SlackChannel.Builder,
                  com.google.cloud.vertexai.api.SlackSource.SlackChannels.SlackChannelOrBuilder>(
                  channels_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
          channels_ = null;
        }
        return channelsBuilder_;
      }
<pre>
Required. The Slack channel IDs.
</pre>

<code>
repeated .google.cloud.vertexai.v1.SlackSource.SlackChannels.SlackChannel channels = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SlackSource.java