/etc/munin/static/definitions.html is in munin 2.0.25-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<link rel="stylesheet" href="style.css" type="text/css" />
<meta http-equiv="refresh" content="300" />
<title>Munin :: definitions</title>
<meta http-equiv="content-type" content="application/xhtml+xml; charset=iso-8859-1" />
<meta name="author" content="Jimmy Olsen" />
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<table cellpadding="3" border="0">
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<td><div class="logo"> </div></td>
<td valign="top"><h1>Definition of terms used in Munin</h1></td>
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<td valign="top" align="left"><a id="data_types">Data types:</a></td>
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<td colspan="2"><hr class="ruler" /></td>
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<td valign="top" align="left">– <a id="gauge">Gauge</a></td>
<td valign="top" align="left">A data source of type gauge shows the state of the data source at the
exact moment that Munin is run (every 5 minutes). Any peaks in-between data gatherings, will not be in
the graph.</td>
</tr>
<tr>
<td valign="top" align="left">– <a id="counter">Counter</a></td>
<td valign="top" align="left">A data source of type counter shows the state of the data source as an
average between two plots (i.e. 5 minutes). Short peaks will therefore be hard to spot, but long peaks
will be spottable, even though it occurs between plots.</td>
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<td valign="top" align="left">– <a id="derive">Derive</a></td>
<td valign="top" align="left">For the purposes of viewing data, the derive type works the same way as a
counter</td>
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<td valign="top" align="left">– <a id="absolute">Absolute</a></td>
<td valign="top" align="left">Absolute works much as a counter, with the exception that it is assumed
that the counter value is set to 0 upon each read of it. It's not a good idea to run these plugins by
hand in-between Munin runs, since Munin won't receive all the data it expects.</td>
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<td colspan="2"><hr class="ruler2" /></td>
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<td valign="top" align="left"></td>
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<table cellpadding="2" cellspacing="4" border="0">
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<td><i class="small"><a href="http://munin-monitoring.org">Munin</a></i></td>
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</html>
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