Mathoid has been overwhelmed with erroneous requests from the Math extension. A sample of MW exception log entries can be found [here](https://logstash.wikimedia.org/#dashboard/temp/AVGiPCSzptxhN1Xa-6Aw). It seems most exceptions are generated only for a handful of pages:
- https://en.wikipedia.org/wiki/Gauss%E2%80%93Kronrod_quadrature_formula
- https://en.wikipedia.org/wiki/Elastic_modulus
- https://en.wikipedia.org/wiki/Legendre_function
- https://en.wikipedia.org/wiki/Generalized_estimating_equation
- https://de.wikipedia.org/wiki/Herz
- https://fr.wikipedia.org/wiki/Loi_log-normale
At the same time, Mathoid's production logs show repetitive 400 errors. See P2422 for a sample of them.
I have tried to issue requests to a local Mathoid instance for all of the `<math>` objects found in the first three pages cited above, but all of them passed the check.