OneSight Administrator Guide

Using Regular Expressions for Pattern Matching
performance data from a log file entry. This data can then be used within
OneSight, both for alerting, using threshold alerts, and reporting. When
specifying a Perl Expression to gather performance data, parentheses are
used within the expression to delimit the numeric data to return.
Log File Entry Modifier Results
There are 100 bytes free /([0-9]+) bytes free/ 100
3/05/01 11:03 AM 5.21 seconds /M (.*) seconds/ 5.21
Defining Expressions for Metric Performance Data
using the OneSight Virtual Agent Monitor
Perl expressions are used to parse the output of a command line program
and return the desired metrics using the OneSight Virtual Agent
Monitor. This data can then be used within OneSight, both for alerting,
using threshold alerts, and reporting. When specifying a Perl Expression
to gather performance data, parentheses are used within the expression to
delimit the numeric data to return.
Command Expression Results
echo 5 ^\w+\W+([0-9]+) 5
vmstat 1 2 / (?:\S+\s+){4,4}([0-9]+)/ Any value in the Free
Memory column of the
vmstat program output
(e.g. 661552.0). Note that
the OneSight Virtual
Agent returns the value
on the last line of the
program output that
matches the expression.
Chapter 5: Configuring Monitors 417