public com.google.protobuf.Timestamp getLastStateTime() {
    return lastStateTime_ == null
        ? com.google.protobuf.Timestamp.getDefaultInstance()
        : lastStateTime_;
  }
public com . google . protobuf . Timestamp getLastStateTime ( ) { return lastStateTime_ == null ? com . google . protobuf . Timestamp . getDefaultInstance ( ) : lastStateTime_ ; }
<pre>
[Output only] The last time a state event was received. Timestamps are
periodically collected and written to storage; they may be stale by a few
minutes.
</pre>

<code>.google.protobuf.Timestamp last_state_time = 20;</code>