Changed to give the influxdb series name as the first word of the servic...

...e field
A function that takes an event and returns a series name would be the best for me. I can use the full :service and :host keys to make a series name, and others can pick and choose what they want the series name to be. 

For me, only using the first part of a :service key until the *.* wouldn't work, as my CollectD metrics prepend the plugin name followed by a *.* and then the actual metric name: <pre>disk-dm-0.disk_merged.read</pre> I would like to keep both, and append the hostname:

<pre>
collectd1.local.disk-dm-0.disk_merged.read
</pre>