Resource filter for Linux disk full

Hi all,

I am trying to NOT monitor the percentage of disk space used on specific 
partitions on a Linux server (Centos 7).
They are always 100% full (e.g. /dev/fd).

I tried to apply a simple resource filter on the netsmnp group.
The commented line will not pass "$OPENNMS_HOME/bin/config-tester 
thresholds.xml"
Any ideas?

<group name="netsnmp" rrdRepository="/opt/opennms/share/rrd/snmp/">
         <threshold
             description="Trigger an alert when the percentage of disk 
space used on any disk reaches or goes above 90% full for two 
consecutive measurement intervals"
             type="high" ds-type="dskIndex" value="90.0" rearm="75.0"
             trigger="2" ds-label="ns-dskPath" filterOperator="or" 
ds-name="ns-dskPercent"/>
<!--
             <resource-filter 
field="ns-dskPath">^(?:(?!(/dev|/dev/fd)).)+$</resource-filter>
-->
         <threshold
             description="Trigger an alert when the percentage of inodes 
used on any disk (excluding the specified special paths) reaches or goes 
above 90% for two consecutive measurement intervals"
             type="high" ds-type="dskIndex" value="90.0" rearm="75.0"
             trigger="2" ds-label="ns-dskPath" filterOperator="or" 
ds-name="ns-dskPercentNode">
             <resource-filter 
field="ns-dskPath">^(?:(?!(/proc|/sys|/dev/pts)).)+$</resource-filter>
         </threshold>

Sincerely,
Dan


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