Export results to JSON on metric docs (by metric name) doesn't work

[statsgeekclare]

Submitted by user: I'm on the page: https://coronavirus.data.gov.uk/metrics/name

And I was hoping to use the "Export results to JSON" link to get a list of all metrics.

But this link doesn't seem to work when I click it.

I've tried a couple of browsers (Firefox and Edge) and getting the same result from both. I tried adding some filters/without filters but getting the same result.