We have noticed that a vscode plugin which has a agent header of vscode-phabricator makes multiple requests per second to phabricator when boot strapping the user database. The issues has been reported upstream however no fix is currently available. As this has caused noticeable user issues to other phabiracator users we have taken the decision to implement rate limiting for this plugin.
This task is a public tracking tasks to provide more information to users who may hit this rate limit.