I'm submitting a ...

• improvement request (usability, performance, tech debt, etc.)

Traffic Control components affected ...

• Traffic Ops
• Traffic Ops ORT

Current behavior:

The GET /deliveryserviceserver route does not support filtering by CDN.

New behavior:

The GET /deliveryserviceserver route should have support for a ?cdn=my-cdn-name query parameter to filter the response by CDN. Once added, we should make t3c use it to filter by CDN instead of requesting the entirety of ds-server assignments across all CDNs. t3c has no need for ds-server assignments for CDNs outside of its own CDN, so this leads to unnecessary network bandwidth usage and database load.

Minimal reproduction of the problem with instructions:

GET /deliveryserviceserver?cdn=my-cdn, notice how it doesn't filter by the given CDN name.