tail_csv plugin not work

[James Wang]

part of my /etc/collectd.conf

 <Plugin tail_csv>

    <Metric "events">

        Type "logevents"

        Instance "events"

        ValueFrom 1

    </Metric>

    <File "/tmp/test.csv">

        Instance "TESTCSV"

        Interval 600

        Collect "haplog"

        TimeFrom 0

    </File>

 </Plugin>

I keep add to /tmp/test.csv

echo 13,14 >> /tmp/test.csv

However, I find no way to see if this worked.

Please shed some light