AdvisorAdding something to the instance description is pretty easy. Just modify your active discovery script so that the output looks like this:
instance3_id##instance3_name##instance3_description
instance4_id##instance4_name##instance4_description
instance5_id##instance5_name##instance5_description
instance6_id##instance6_name##instance6_description
If you want to alert whenever DaystoExpire is not positive, just set a threshold on that datapoint for < 0.
If you want to list the issuer in the resource tree, adding it as the description would do it. Instance descriptions show up in smaller text under each instance.
If you want it to show up on a dashboard, you might end up needing to make the issuer part of the instance name. Worth trying out other methods before going to that extreme.
For what it's worth, if you specify the issuer as an instance level property, you could automatically group the instances by issuer under the resource tree.
