Right now we are looking into telegraf replacing our crappy collect librato agent. All of our existing alarms inside librato require some special names (which i can rename without a hassle) and metrics. One of those is sending an alert if the free disk space in percent is crossing a threshold. telegraf disk plugin reports used disk space in percent. Is there a way to negate / invert the value without patching the plugin itself? I’ve looked into processors, enum ,aggregators and so on and could not find any possibility to do so.