code: public boolean containsTotalBytesOnTiers(
        java.lang.String key) {
      if (key == null) { throw new java.lang.NullPointerException(); }
      return internalGetTotalBytesOnTiers().getMap().containsKey(key);
    }
docs: <pre>
  * the map of total bytes on each tier
  </pre>
  
  <code>map&lt;string, int64&gt; totalBytesOnTiers = 3;</code>