Rate limiting affects server administrator

[boogewooge]

Background information

• Dendrite version or git SHA: 0.8.9
• Monolith or Polylith?: Monolith
• SQLite3 or Postgres?: Postgres
• Running in Docker?: No
• go version: 1.18.4
• Client used (if applicable): Element Web/Desktop

In https://github.com/matrix-org/dendrite/issues/2589, where rate_limiting being enabled causes issues, a server administrator (more than one in fact) was also affected, though https://github.com/matrix-org/dendrite/blob/main/dendrite-sample.monolith.yaml#L182= indicates that shouldn't be the case.

[kegsay]

We need to ensure we're testing that exempt_user_ids are actually being exempted from the rate limiting code.

[S7evinK]

The problem I'm seeing is that the endpoint doesn't require authentication, so we don't have a device we can check for admin/exempt users.