@java.lang.Override
    public Builder toBuilder() {
      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
    }
<pre>
Required. The SecretManager secret version resource name (e.g.
projects/{project}/secrets/{secret}/versions/{version}) storing the
Slack channel access token that has access to the slack channel IDs.
See: https://api.slack.com/tutorials/tracks/getting-a-token.
</pre>

<code>
.google.cloud.vertexai.v1.ApiAuth.ApiKeyConfig api_key_config = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SlackSource.java