LoadPlugin tail
<Plugin tail>
    <File "/var/cfengine/promise_summary.log">
        Instance "cfengine"
        <Match>
            Regex "kept ([0-9]*\.[0-9]*)%"
            DSType "GaugeLast"
            Type "gauge"
            Instance "promises-kept"
        </Match>
        <Match>
            Regex "Promises repaired ([0-9]*\.[0-9]*)%"
            DSType "GaugeLast"
            Type "gauge"
            Instance "promises-repaired"
        </Match>
        <Match>
            Regex "Promises not repaired ([0-9]*\.[0-9]*)%"
            DSType "GaugeLast"
            Type "gauge"
            Instance "promises-unrepaired"
        </Match>
    </File>
</Plugin>