public Builder addAllPersistentDirectories(
        java.lang.Iterable<
                ? extends
                    com.google.cloud.workstations.v1beta.WorkstationConfig.PersistentDirectory>
            values) {
      if (persistentDirectoriesBuilder_ == null) {
        ensurePersistentDirectoriesIsMutable();
        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, persistentDirectories_);
        onChanged();
      } else {
        persistentDirectoriesBuilder_.addAllMessages(values);
      }
      return this;
    }
<pre>
Optional. Directories to persist across workstation sessions.
</pre>

<code>
repeated .google.cloud.workstations.v1beta.WorkstationConfig.PersistentDirectory persistent_directories = 13 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java