It is great that there are ways to do this with Data Explorer, but it would be lovely to just have a Category filter on the main /admin dashboard. I came across this: https://meta.discourse.org/t/visualised-traffic-statistics/ and it looks like there may have been a Category filter at one point, unless that is something different.
The “Community Health” dashboard is an awesome way to see at a glance the simple overview statistics on whether you are building a healthy community. I look after one category on a bigger discourse and for me, my “Community” that I want to build and grow is that category. I have different team members looking after sub-categories and again, I would love to see how they are building and growing their communities by having simple overview statistics of their sub-category.