The recommendation api on scb eqiad nodes seems to be failing intermittently, causing alerts to SRE.
It seems a problem with API calls like the following, returning intermittently HTTP 200 (expected one) or 404/503 (not expected). To reproduce:
curl http://scb1001.eqiad.wmnet:9632/uz.wikipedia.org/v1/article/creation/morelike/Palov -i
We thought that the problem was WDQS internal but after a chat with the Search team, we didn't find any outstanding problem. This seems to be something related to the application itself, so I'd ask to the Research team a quick look if possible to help us debugging :)