# What this PR does
This PR:
- adds a few attributes to paginated API responses
- removes channel filter "send demo alert" internal API endpoint + tests
(this endpoint was marked as deprecated + not consumed by the web UI)
With the new paginated API response schema, the web UI will no longer
need to:
- hardcode `ITEMS_PER_PAGE` for each table
- manually calculate total number of pages
(these two things ☝️ will be done in
https://github.com/grafana/oncall/issues/2476)
For `GET /api/internal/v1/alertgroups` the response will now look like
this:
```diff
{
"next": <url> | None,
"previous": <url> | None,
"results": [],
++ "page_size": <int>
}
```
For all other paginated API responses, the response will now look like:
```diff
{
"count": <int>,
"next": <url> | None,
"previous": <url> | None,
"results": [],
++ "page_size": <int>,
++ "current_page_number": <int>,
++ "total_pages": <int>
}
```
## TODO
- [x] update public API docs to include these new attributes
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
