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This article shows you how to update the Logstash patterns on Nagios Log Server. This might resolve issues with logs not being parsed which can lead to a _grokparsefailure.
Open an SSH session to a Nagios Log Server node.
Type:
cd /usr/local/nagioslogserver/logstash/bin
./plugin update logstash-patterns-core
Which should give you an output like:
Updating logstash-patterns-core
Updated logstash-patterns-core 0.1.10 to 0.4.0
You will need to perform this on all of your Nagios Log Server nodes.
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