Datadog dashboard linked on Testing CI page broken

[wookie184]

The Datadog dashboard linked on the Testing CI page doesn't work for me. The page loads, but shows no data.

rustc-dev-guide/src/tests/ci.md

Line 465 in 48d0f3c

[public dashboard]: https://p.datadoghq.com/sb/3a172e20-e9e1-11ed-80e3-da7ad0900002-b5f7bb7e08b664a06b08527da85f7e30

I couldn't find any other information about the dashboard, other than PR #2167 by @marcoieni adding the link to the docs.

Should the dashboard be fixed, or should this section be removed from the docs?

[tshepang]

would rather the link be fixed, assuming it is considered a useful dashboard