Use Gateway Stats Batch API in the Console

[KrishnaIyer]

Summary

Use Gateway Stats Batch API in the Console.

Current Situation

Clients (including the console) today use the GetGatewayConnectionStats (and it's HTTP end point) to fetch stats for a single gateway.

With #5536 we now support a new BatchGetGatewayConnectionStats end point that can retrieve the connection stats for a batch of gateways in a single call.

Why do we need this? Who uses it, and when?

Switching to the new BatchGetGatewayConnectionStats RPC will drastically reduce the API calls made (esp) by the console to TTS.

Proposed Implementation

Use BatchGetGatewayConnectionStats (/gs/gateways/connection/stats HTTP end point) and post the list of gateway IDs.

Make sure to check the gateway_server_address of each gateway, collect gateways that have a common address (cluster) and send the request to the GS of that address (cluster).

Contributing

• I can help by doing more research.
• I can help by implementing the feature after the proposal above is approved.
• I can help by testing the feature before it's released.

Code of Conduct

• I agree to follow TTN's Community Code of Conduct.

[KrishnaIyer]

Assigning @kschiffer for triaging.

[KrishnaIyer]

Let's hold this on https://github.com/TheThingsIndustries/product-management/issues/6, which introduces batch rights checks.

[KrishnaIyer]

Reassigning this for this milestone.