The webpage text service had a period of about 7 hours where it was not reliably retrieving webpage text. It was not completely unavailable, but it was not working reliably either. I fixed this. All servers are now operating as expected.
I am sorry about this. The fact that this went on for so long without my being aware of it is inexcusable. I am working on improvements to my monitoring so that such a scenario does not go undetected going forward.