Problem: I can't tell which security groups are in use, or which instances belong to which security groups
Problem/Opportunity Statement
Related to #129.
At present, it is not clear which security groups are in use or which instances belong to particular security groups.
What would success / a fix look like?
Perhaps enabled by #980 (comment 1855420298), it would be possible to:
- Display the number of instances in a security group on its list item and/or detail page,
- Filter instances by security group,
- List the instances belonging to a security group on its detail page.