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doc: add information about log cleaner

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Marco Wang 2019-11-05 17:33:07 +08:00
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@ -543,6 +543,24 @@ setting <code>GOOGLE_STRIP_LOG</code> to 1 or greater removes
all log messages associated with <code>VLOG</code>s as well as
<code>INFO</code> log statements.
<h3><A NAME=strip>Automatically Remove Old Logs</A></h3>
<p>To enable the log cleaner:
<pre>
google::EnableLogCleaner(3); // keep your logs for 3 days
</pre>
And then Google glog will check if there are overdue logs whenever
a flush is performed. In this example, any log file from your project whose
last modified time is greater than 3 days will be unlink()ed.
<p>This feature can be disabled at any time (if it has been enabled)
<pre>
google::DisableLogCleaner();
</pre>
<h3><A NAME=windows>Notes for Windows users</A></h3>
<p>Google glog defines a severity level <code>ERROR</code>, which is