# What this PR does
Remove
[`apps.get_model`](https://docs.djangoproject.com/en/3.2/ref/applications/#django.apps.apps.get_model)
invocations and use inline `import` statements in places where models
are imported within functions/methods to avoid circular imports.
I believe `import` statements are more appropriate for most use cases as
they allow for better static code analysis & formatting, and solve the
issue of circular imports without being unnecessarily dynamic as
`apps.get_model`. With `import` statements, it's possible to:
- Jump to model definitions in most IDEs
- Automatically sort inline imports with `isort`
- Find import errors faster/easier (most IDEs highlight broken imports)
- Have more consistency across regular & inline imports when importing
models
This PR also adds a flake8 rule to ban imports of `django.apps.apps`, so
it's harder to use `apps.get_model` by mistake (it's possible to ignore
this rule by using `# noqa: I251`). The rule is not enforced on
directories with migration files, because `apps.get_model` is often used
to get a historical state of a model, which is useful when writing
migrations ([see this SO answer for more
details](https://stackoverflow.com/a/37769213)). So `apps.get_model` is
considered OK in migrations (even necessary in some cases).
## 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
This is a follow up to #2502 which started to remove logic to
"archiving" alert groups. This PR:
- removes all references to `AlertGroup.is_archived` and marks the
column as deprecated. We will remove it in the next release
- removes the `AlertGroup.unarchived_objects` `Manager`
- renames the `AlertGroup.all_objects` `Manager` to `AlertGroup.objects`
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [ ] 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
This PR simplifies code of maintenance mode.
1. Perform distribution/escalation maintenance checks in send_signal...
tasks.
2. Use usual alert distribution flow for the maintenance incident.
3. Decouple maintenance mode from slack (all, except
**notify_about_maintenance_action** methods, I don't want to make this
PR too big)
As a bonus from these changes, maintenance mode now mute alert group
delivery in all chatops integrations, not only in slack. (Before,
incidents happened while maintenance were posted to telegram and msteams
anyway)
## Checklist
- [ ] Tests updated
- [ ] Documentation added
- [ ] `CHANGELOG.md` updated
