Provide HSv3 metrics (like the HSv2 ones)
It's funny to make this ticket so late, but I can't find another one like this.
Anyhow, we should provide HSv3 statistics like we do for HSv2, so that we can track deployment and adoption over time.
I'm putting it as part of legacy/trac#29995 (moved) so that we can roadmap it as part of the stretch goals for this objective.