set,
            it is assumed that the sink will accept any log record.
          </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
              Like the logging core, all sink frontends assume it is safe to call
              filters from multiple threads concurrently. This is fine with the library