I have a new collectd + graphite install on centos6.3 running, I'm wondering where I configure the correct transforms for network traffic and uptime values for example. My uptime on a test centos6 host shows as '2270.0 K' in graphite, I want to convert to hours,days,months, etc. The collectd df plugin shows disk free space in K, I'd like to convert to MB or GB. Where can I configure these filters/transforms ? I see options in the graphite 'apply function' menu, but not sure exactly how to enter them.