private void maybeForceBuilderInitialization() {
          if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
            getStartTimeFieldBuilder();
            getEndTimeFieldBuilder();
          }
        }
<pre>
SlackChannel contains the Slack channel ID and the time range to import.
</pre>

Protobuf type {@code google.cloud.vertexai.v1.SlackSource.SlackChannels.SlackChannel}
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SlackSource.java