# What this PR does
https://www.loom.com/share/1ac33822301444748133ffe72638ddc4
The two asks in the [original GH
issue](https://github.com/grafana/oncall-private/issues/2947) were:
> 1. Make the error message clearer. We can identify if it's delivering
or updating and being rate-limited. This is possible because Slack sets
limits per API method. Also, this limit is a per-slack channel while we
are posting messages & applying ratelimit per on-call integration, which
confuses customers.
> 2. Debounce update alert group message in Slack
Both of these have been addressed in this PR
## Which issue(s) this PR closes
Closes https://github.com/grafana/oncall-private/issues/2947
## 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] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
show up in the autogenerated release notes.
# What this PR does
**Shift Swap Requests**
https://www.loom.com/share/860c3337b338412cbd2ac4024260f3e8?sid=3d91b558-b4de-4351-8b45-8a99b7302346
**Other**
- Drastically improve the typing in the `slack` Django app, and several
other models/functions that were consumed by logic within the `slack`
Django app (ex. setting `RelatedManager` type hints on various models)
https://www.loom.com/share/da6b9984519c48d59a45d3c93c08d7dc
## 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)
# What this PR does
See #2173
Also, closes#2187 . All of the new files under `type_stubs/icalendar`
were autogenerated by running:
```bash
stubgen -p icalendar -o type_stubs
```
## Checklist
- [ ] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [ ] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
