Hello, ORES has policy that no more than four parallel connections per IP should be requesting the service. We weren't enforcing this policy and that caused several outages before.
As of today if there is more than four connections per IP, the responses after fourth one will be throttled and will be slower, and after seventh connection, ORES just responds with immediate time out error.
This might affect CloudVPS and Toolforge users who connect to ORES from there but there are several IPs coming from the cloud and looking at request statistics, this limit is bigger than the usage. But if you are having trouble using ORES in the cloud, let me know so I add those IPs to the whitelist.
This limit only applies to external connections and it should not affect internal requests coming from mediawiki or the change propagation service.
For more information, please read https://phabricator.wikimedia.org/T160692 and file a task against ORES project in phabricator in case anything is wrong.
Happy scoring! Best