It looks like a widespread issue across a few old factory branches...
It's already tracked here:
https://buganizer.corp.google.com/issues/62782912

ChromeOS Infra P1 Bugscrub.

P1 Bugs in this component should be important enough to get weekly status updates.

Is this already fixed?  -> Fixed
Is this no longer relevant? -> Archived or WontFix
Is this not a P1, based on go/chromeos-infra-bug-slo rubric? -> lower priority.
Is this a Feature Request rather than a bug? Type -> Feature
Is this missing important information or scope needed to decide how to proceed? -> Ask question on bug, possibly reassign.
Does this bug have the wrong owner? -> reassign.

Bugs that remain in this state next week will be downgraded to P2.

Assigning to alemate@, who is the assignee of the buganizer bug.

Looks like a problem with gclient's schema validation?

The latest build works though:
https://uberchromegw.corp.google.com/i/chromeos.branch/builders/veyron_fievel%20factory%20factory-veyron-7505.B

Build bots seems to be happy.