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developer-guidelines.sgml: Allow special value "U"

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Allow a literal "U" to be specified in place of an actual value within
the performance data string.  An "U" corresponds to RRDtool's "UNKNOWN"
value; i.e., it's meant to indicate that data acquisition failed for
some reason.  PNP4Nagios already supports this extension.
This commit is contained in:
Holger Weiss 2013-08-21 21:50:55 +02:00
parent 1609749226
commit c542ca9136
1 changed files with 2 additions and 1 deletions
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doc/developer-guidelines.sgml
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@ -347,7 +347,8 @@
<listitem><para>min and max are not required if UOM=%</para>
</listitem>
<listitem><para>value, min and max in class [-0-9.]. Must all be the
same UOM</para>
same UOM. value may be a literal "U" instead, this would indicate that the
actual value couldn't be determined</para>
</listitem>
<listitem><para>warn and crit are in the range format (see
<xref linkend="thresholdformat">). Must be the same UOM</para>