Hmm, the links go to #invalid-build-id.

those builds are probably old, have old format?
for example latest build linux_chromium_variable_32 have this issue and its latest build is from august: 
https://ci.chromium.org/buildbot/tryserver.chromium.linux/linux_chromium_variable_32/

Ah, ok. It might be nice to send them to the builder page in that case. WDYT?

It might also be good to have a color for super stale statuses, but that's more debatable.

Adding labels for tracking

Using "#invalid-build-id" was intentional in order to communicate the error so that people wouldn't confusedly find themselves back on the builder page. One possibility would be to have an intermediate page that redirects to builder page in 30s or similar.