Since we don't have the source in a public repo currently:

In T239220#5704480, @Samwalton9 wrote:

Could this be related to T179986 - another Phab task related to Python sseclient randomly hanging on the eventstreams?

In T239220#5700303, @elukey wrote:

If you are still seeing impact it means that it was not related to connections slot being fully, since we have been stable for a while. Is there a way that you can show us a graph related to the missing events? It would help a lot in debugging.. Moreover, did you notice if you missed events or if they have just slowed down?

Within the last minute or two, I just saw another burst of several thousand messages after a long pause. Now they are coming back in again at the usual rate of a few URLs per second.

We have a very simple Python loop around sseclient.SSEClient('https://stream.wikimedia.org/v2/stream/page-links-change'). We parse the message data JSON blob, and take any external links for changes with added_links, and put those URLs onto a Kafka topic. Starting sometime after midnight UTC on November 18th our graphs showed a significant decrease in the number of URLs put onto that Kafka topic.