ALT text for colored icons

The ALT text for the various icons to notify us of problems show "sslcert:yellow:4.47 days" and "sslcert:yellow:acked:4.47 days". Would it be reasonable to change it to "sslcert:yellow:4.47 days:acked:2 hours" or something like that, so it's more obvious that yellow & acked aren't both the same time period? Or is that loading too much into an ALT tag?

Tracy J. Di Marco White Information Technology Services Iowa State University