Improve statistics for multidomain sites

May be relevant again in the new module roadmap for the "transitions tracking" part of the plan at 🌱 Plan for Statistics 1.x Active .

Was checking for issue filed against outdated versions and found this.

If this could be relevant for the new module then let's move it to the contrib project so it can get some attention.

Wow, that's a good one, actually: multi-sites can exist in multiple DBs or a single one (e.g. with Domain Access). In the case of multiple DBs there is no real issue, as there is little case to be made that those are a single site.

However within a single DB, having per-site stats could really be relevant. I'm thinking of a site factory with hundreds of sites for France Televisions, where each one had different stakeholders and would be interested in their own specific sites.

And then, of course, one would need to also provide aggregate counts for site factory stats.

Actually a duplicate of 🐛 Allow domain aliases to be tracked by statistics module Active .