Bug#959165: udd vcswatch: 429 "Retry later" or "could not read Username" from Salsa

[Rebecca N. Palmer]

Package: qa.debian.org
User: qa.debian....@packages.debian.org
Usertags: udd
Some packages' vcswatch pages have the error

fatal: could not read Username for 'https://salsa.debian.org': No such 
device or address

(e.g. apertium-bel, python-asteval) or

remote: Retry later fatal: unable to access 
'https://salsa.debian.org/science-team/gazebo.git/': The requested URL 
returned error: 429

(e.g. beignet, spyder).

Have we accidentally tripped our own DoS protections (similar to #955268)?