Latest version of graphite metric

Hello,
I’m using Grafana and Graphite DB to monitoring BPM process. I store my metrics in
node.processName.count but in my app i have many processVersion so my metrics looks like that
1.GEN_AP_1.count
1.GEN_AP_2.count
1.GEN_AP_3.count

1,2,3 is a version of process. How to tell graphite to search last version of process ?