Feature request: Alerting for Disk IO

I went to IRC today to get some help in setting up alerts for Disk IO. After talking there, I found that Disk IO can be accessed using the ucd_diskio Entity, however, I have learned that these values are not stored, and as such, alerting can not be performed. I was directed here to ask that Disk IO data values be stored and made available for alerting, as that will greatly aid in some of the issues my team is trying to identify and isolate. Thank you!