uo;<samp>level</samp>&rsquo;</dt>
<dd><p>Indicates that log output should add a <code>[level]</code> prefix to each message
line. This can be used as an alternative to log coloring, e.g. when dumping the
log to file.
</p></dd>
</dl>
<p>Flags can also be used alone by adding a &rsquo;+&rsquo;/&rsquo;-&rsquo; prefix to set/reset a single
flag without affecting other <var>flags</var> or changing <var>loglevel</var>. When
setting both <var>flags</var> and <var>loglevel</var>, a &rsquo;+&rsquo; separator is expe