Consensus health should say that the valid after time is in UTC

The valid after time on the consensus health page is in UTC, and we should say that. It's ok to do this just for the first time on the page.

Or we could add "All times are in UTC."

added component::metrics/consensus health owner::tom priority::medium resolution::fixed severity::normal status::closed type::defect labels

Trac:
Resolution: N/A to fixed
Status: new to closed

closed