# What this PR does
The current implementation of the direct paging feature doesn't page
additional responders if the alert group is acknowledged, silenced, or
resolved, and doesn't show any warnings for such cases.
This PR makes so that adding responders for silenced & acknowledged
alert groups actually pages the selected user / schedule. For resolved
alert groups, a warning message will be shown both in web UI and Slack.
## Which issue(s) this PR fixes
Related to https://github.com/grafana/oncall/issues/2442
## 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
- Adds [`mypy` static type checking](https://mypy-lang.org/) to our CI
pipeline. Currently there is still a **ton** of errors being returned by
the tool, as we'll need to fix pre-existing errors. I think we can
slowly chip away at these errors in small PRs, doing them all in one
large PR is likely very risky.
- Also, this PR starts chipping away at one of the main type errors that
we have which is accessing the `datetime` class (from the `datetime`
library) or `timedelta` function on the `django.utils.timezone` module.
Basically we should be instead accessing these two objects from the
native `datetime` module. This makes sense because the [`__all__`
attribute](https://github.com/django/django/blob/main/django/utils/timezone.py#L14-L30)
in `django.utils.timezone` does not re-export `datetime` or `timedelta`.
- splits `engine` dependencies out into `requirements.txt` and
`requirements-dev.txt`
## Checklist
- [ ] Unit, integration, and e2e (if applicable) tests updated (N/A)
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required) (N/A)
- [ ] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required) (N/A)
# What this PR does
Make direct paging internal API endpoint return an alert group ID.
## Which issue(s) this PR fixes
Related to https://github.com/grafana/oncall/issues/823
## Checklist
- [x] Tests updated
Also changes the default integration used when creating an alert group
for a direct page to a custom manual integration to avoid
conflicts/unexpected behaviors with existing manual alerts.
