@java.lang.Override
      public int hashCode() {
        if (memoizedHashCode != 0) {
          return memoizedHashCode;
        }
        int hash = 41;
        hash = (19 * hash) + getDescriptor().hashCode();
        hash = (37 * hash) + CHANNEL_ID_FIELD_NUMBER;
        hash = (53 * hash) + getChannelId().hashCode();
        if (hasStartTime()) {
          hash = (37 * hash) + START_TIME_FIELD_NUMBER;
          hash = (53 * hash) + getStartTime().hashCode();
        }
        if (hasEndTime()) {
          hash = (37 * hash) + END_TIME_FIELD_NUMBER;
          hash = (53 * hash) + getEndTime().hashCode();
        }
        hash = (29 * hash) + getUnknownFields().hashCode();
        memoizedHashCode = hash;
        return hash;
      }
<pre>
Optional. The ending timestamp for messages to import.
</pre>

<code>.google.protobuf.Timestamp end_time = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SlackSource.java