@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uid_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 3, uid_);
    }
    if (reconciling_ != false) {
      output.writeBool(4, reconciling_);
    }
    com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
        output, internalGetAnnotations(), AnnotationsDefaultEntryHolder.defaultEntry, 5);
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(6, getCreateTime());
    }
    if (((bitField0_ & 0x00000002) != 0)) {
      output.writeMessage(7, getUpdateTime());
    }
    if (((bitField0_ & 0x00000008) != 0)) {
      output.writeMessage(8, getDeleteTime());
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(etag_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 9, etag_);
    }
    if (state_
        != com.google.cloud.workstations.v1beta.Workstation.State.STATE_UNSPECIFIED.getNumber()) {
      output.writeEnum(10, state_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(host_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 11, host_);
    }
    com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
        output, internalGetEnv(), EnvDefaultEntryHolder.defaultEntry, 12);
    com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
        output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 13);
    if (((bitField0_ & 0x00000004) != 0)) {
      output.writeMessage(14, getStartTime());
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Optional. Environment variables passed to the workstation container's
entrypoint.
</pre>

<code>map&lt;string, string&gt; env = 12 [(.google.api.field_behavior) = OPTIONAL];</code>
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/Workstation.java