chore: random slack code cleanup (#5307)

# What this PR does

Related to #5287

Few random "clean-ups", type improvements, etc.

Additionally, fixes a change made in #5292; we should wait to read from
`slack_message.channel.slack_id`, until we've performed the
data-migration mentioned in that PR (in the mean-time we should continue
to use `slack_message._channel_id`).

## 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.

engine/apps/alerts/models/alert_group.py

@@ -674,7 +674,7 @@ def acknowledge_by_user_or_backsync(
         organization_id = user.organization_id if user else self.channel.organization_id
         logger.debug(f"Started acknowledge_by_user_or_backsync for alert_group {self.pk}")
 
-        # if incident was silenced or resolved, unsilence/unresolve it without starting escalation
+        # if alert group was silenced or resolved, unsilence/unresolve it without starting escalation
         if self.silenced:
             self.un_silence()
             self.log_records.create(
@@ -1990,6 +1990,13 @@ def slack_channel_id(self) -> str | None:
 
     @property
     def slack_message(self) -> typing.Optional["SlackMessage"]:
+        """
+        `slack_message` property returns the first `SlackMessage` for the `AlertGroup`. This corresponds to the
+        Slack message representing the main message in Slack (ie. not a message in a thread).
+
+        This should not be confused with `slack_messages`, which is a `RelatedManager` that returns all `SlackMessage`
+        instances for the `AlertGroup`.
+        """
         try:
             # prefetched_slack_messages could be set in apps.api.serializers.alert_group.AlertGroupListSerializer
             return self.prefetched_slack_messages[0] if self.prefetched_slack_messages else None

engine/apps/alerts/models/alert_receive_channel.py

@@ -43,7 +43,7 @@
 
     from apps.alerts.models import AlertGroup, ChannelFilter
     from apps.labels.models import AlertReceiveChannelAssociatedLabel
-    from apps.user_management.models import Organization, Team
+    from apps.user_management.models import Organization, Team, User
 
 logger = logging.getLogger(__name__)
 
@@ -391,7 +391,7 @@ def save(self, *args, **kwargs):
 
         return super().save(*args, **kwargs)
 
-    def change_team(self, team_id, user):
+    def change_team(self, team_id: int, user: "User") -> None:
         if team_id == self.team_id:
             raise TeamCanNotBeChangedError("Integration is already in this team")
 
@@ -409,34 +409,34 @@ def grafana_alerting_sync_manager(self):
         return GrafanaAlertingSyncManager(self)
 
     @property
-    def is_alerting_integration(self):
+    def is_alerting_integration(self) -> bool:
         return self.integration in {
             AlertReceiveChannel.INTEGRATION_GRAFANA_ALERTING,
             AlertReceiveChannel.INTEGRATION_LEGACY_GRAFANA_ALERTING,
         }
 
     @cached_property
-    def team_name(self):
+    def team_name(self) -> str:
         return self.team.name if self.team else "No team"
 
     @cached_property
-    def team_id_or_no_team(self):
+    def team_id_or_no_team(self) -> str:
         return self.team_id if self.team else "no_team"
 
     @cached_property
-    def emojized_verbal_name(self):
+    def emojized_verbal_name(self) -> str:
         return emoji.emojize(self.verbal_name, language="alias")
 
     @property
-    def new_incidents_web_link(self):
+    def new_incidents_web_link(self) -> str:
         from apps.alerts.models import AlertGroup
 
         return UIURLBuilder(self.organization).alert_groups(
             f"?integration={self.public_primary_key}&status={AlertGroup.NEW}",
         )
 
     @property
-    def is_rate_limited_in_slack(self):
+    def is_rate_limited_in_slack(self) -> bool:
         return (
             self.rate_limited_in_slack_at is not None
             and self.rate_limited_in_slack_at + SLACK_RATE_LIMIT_TIMEOUT > timezone.now()
@@ -450,11 +450,11 @@ def start_send_rate_limit_message_task(self, delay=SLACK_RATE_LIMIT_DELAY):
         post_slack_rate_limit_message.apply_async((self.pk,), countdown=delay, task_id=task_id)
 
     @property
-    def alert_groups_count(self):
+    def alert_groups_count(self) -> int:
         return self.alert_groups.count()
 
     @property
-    def alerts_count(self):
+    def alerts_count(self) -> int:
         from apps.alerts.models import Alert
 
         return Alert.objects.filter(group__channel=self).count()
@@ -464,7 +464,7 @@ def is_able_to_autoresolve(self) -> bool:
         return self.config.is_able_to_autoresolve
 
     @property
-    def is_demo_alert_enabled(self):
+    def is_demo_alert_enabled(self) -> bool:
         return self.config.is_demo_alert_enabled
 
     @property
@@ -513,7 +513,7 @@ def get_or_create_manual_integration(cls, defaults, **kwargs):
         return alert_receive_channel
 
     @property
-    def short_name(self):
+    def short_name(self) -> str:
         if self.verbal_name is None:
             return self.created_name + "" if self.deleted_at is None else "(Deleted)"
         elif self.verbal_name == self.created_name:
@@ -548,14 +548,14 @@ def integration_url(self) -> str | None:
         return create_engine_url(f"integrations/v1/{slug}/{self.token}/")
 
     @property
-    def inbound_email(self):
+    def inbound_email(self) -> typing.Optional[str]:
         if self.integration != AlertReceiveChannel.INTEGRATION_INBOUND_EMAIL:
             return None
 
         return f"{self.token}@{live_settings.INBOUND_EMAIL_DOMAIN}"
 
     @property
-    def default_channel_filter(self):
+    def default_channel_filter(self) -> typing.Optional["ChannelFilter"]:
         return self.channel_filters.filter(is_default=True).first()
 
     # Templating
@@ -590,7 +590,7 @@ def templates(self):
         }
 
     @property
-    def is_available_for_custom_templates(self):
+    def is_available_for_custom_templates(self) -> bool:
         return True
 
     # Maintenance

engine/apps/alerts/tasks/escalate_alert_group.py

@@ -6,7 +6,6 @@
 
 from common.custom_celery_tasks import shared_dedicated_queue_retry_task
 
-from .compare_escalations import compare_escalations
 from .task_logger import task_logger
 
 
@@ -29,7 +28,7 @@ def escalate_alert_group(alert_group_pk):
         except IndexError:
             return f"Alert group with pk {alert_group_pk} doesn't exist"
 
-        if not compare_escalations(escalate_alert_group.request.id, alert_group.active_escalation_id):
+        if escalate_alert_group.request.id != alert_group.active_escalation_id:
             return "Active escalation ID mismatch. Duplication or non-active escalation triggered. Active: {}".format(
                 alert_group.active_escalation_id
             )

engine/apps/alerts/tasks/notify_user.py

@@ -17,7 +17,6 @@
 from apps.phone_notifications.phone_backend import PhoneBackend
 from common.custom_celery_tasks import shared_dedicated_queue_retry_task
 
-from .compare_escalations import compare_escalations
 from .task_logger import task_logger
 
 if typing.TYPE_CHECKING:
@@ -618,7 +617,7 @@ def send_bundled_notification(user_notification_bundle_id: int):
             )
             return
 
-        if not compare_escalations(send_bundled_notification.request.id, user_notification_bundle.notification_task_id):
+        if send_bundled_notification.request.id != user_notification_bundle.notification_task_id:
             task_logger.info(
                 f"send_bundled_notification: notification_task_id mismatch. "
                 f"Duplication or non-active notification triggered. "

engine/apps/alerts/tasks/unsilence.py

@@ -5,7 +5,6 @@
 
 from common.custom_celery_tasks import shared_dedicated_queue_retry_task
 
-from .compare_escalations import compare_escalations
 from .send_alert_group_signal import send_alert_group_signal
 from .task_logger import task_logger
 
@@ -17,17 +16,20 @@ def unsilence_task(alert_group_pk):
     from apps.alerts.models import AlertGroup, AlertGroupLogRecord
 
     task_logger.info(f"Start unsilence_task for alert_group {alert_group_pk}")
+
     with transaction.atomic():
         try:
             alert_group = AlertGroup.objects.filter(pk=alert_group_pk).select_for_update()[0]  # Lock alert_group:
         except IndexError:
             task_logger.info(f"unsilence_task. alert_group {alert_group_pk} doesn't exist")
             return
-        if not compare_escalations(unsilence_task.request.id, alert_group.unsilence_task_uuid):
+
+        if unsilence_task.request.id != alert_group.unsilence_task_uuid:
             task_logger.info(
                 f"unsilence_task. alert_group {alert_group.pk}.ID mismatch.Active: {alert_group.unsilence_task_uuid}"
             )
             return
+
         if alert_group.status == AlertGroup.SILENCED and alert_group.is_root_alert_group:
             initial_state = alert_group.state
             task_logger.info(f"unsilence alert_group {alert_group_pk} and start escalation if needed")

engine/apps/alerts/tests/test_alert_group.py

@@ -152,11 +152,11 @@ def test_delete(
     # Check that appropriate Slack API calls are made
     assert mock_chat_delete.call_count == 2
     assert mock_chat_delete.call_args_list[0] == call(
-        channel=resolution_note_1.slack_channel_id, ts=resolution_note_1.ts
+        channel=resolution_note_1.slack_channel.slack_id, ts=resolution_note_1.ts
     )
     assert mock_chat_delete.call_args_list[1] == call(channel=slack_message.channel.slack_id, ts=slack_message.slack_id)
     mock_reactions_remove.assert_called_once_with(
-        channel=resolution_note_2.slack_channel_id, name="memo", timestamp=resolution_note_2.ts
+        channel=resolution_note_2.slack_channel.slack_id, name="memo", timestamp=resolution_note_2.ts
     )
 
 

engine/apps/alerts/tests/test_maintenance.py

@@ -16,9 +16,7 @@ def maintenance_test_setup(
 
 
 @pytest.mark.django_db
-def test_start_maintenance_integration(
-    maintenance_test_setup, make_alert_receive_channel, mock_start_disable_maintenance_task
-):
+def test_start_maintenance_integration(maintenance_test_setup, make_alert_receive_channel):
     organization, user = maintenance_test_setup
 
     alert_receive_channel = make_alert_receive_channel(
@@ -37,9 +35,7 @@ def test_start_maintenance_integration(
 
 
 @pytest.mark.django_db
-def test_start_maintenance_integration_multiple_previous_instances(
-    maintenance_test_setup, make_alert_receive_channel, mock_start_disable_maintenance_task
-):
+def test_start_maintenance_integration_multiple_previous_instances(maintenance_test_setup, make_alert_receive_channel):
     organization, user = maintenance_test_setup
 
     alert_receive_channel = make_alert_receive_channel(
@@ -64,9 +60,7 @@ def test_start_maintenance_integration_multiple_previous_instances(
 
 
 @pytest.mark.django_db
-def test_maintenance_integration_will_not_start_twice(
-    maintenance_test_setup, make_alert_receive_channel, mock_start_disable_maintenance_task
-):
+def test_maintenance_integration_will_not_start_twice(maintenance_test_setup, make_alert_receive_channel):
     organization, user = maintenance_test_setup
 
     alert_receive_channel = make_alert_receive_channel(
@@ -91,7 +85,6 @@ def test_alert_attached_to_maintenance_incident_integration(
     maintenance_test_setup,
     make_alert_receive_channel,
     make_alert_with_custom_create_method,
-    mock_start_disable_maintenance_task,
 ):
     organization, user = maintenance_test_setup
 
@@ -122,7 +115,6 @@ def test_stop_maintenance(
     maintenance_test_setup,
     make_alert_receive_channel,
     make_alert_with_custom_create_method,
-    mock_start_disable_maintenance_task,
 ):
     organization, user = maintenance_test_setup
     alert_receive_channel = make_alert_receive_channel(

engine/apps/alerts/tests/test_notify_user.py

@@ -530,47 +530,73 @@ def test_send_bundle_notification(
     alert_group_1 = make_alert_group(alert_receive_channel=alert_receive_channel)
     alert_group_2 = make_alert_group(alert_receive_channel=alert_receive_channel)
     alert_group_3 = make_alert_group(alert_receive_channel=alert_receive_channel)
+
+    task_id = "test_task_id"
     notification_bundle = make_user_notification_bundle(
-        user, UserNotificationPolicy.NotificationChannel.SMS, notification_task_id="test_task_id", eta=timezone.now()
+        user, UserNotificationPolicy.NotificationChannel.SMS, notification_task_id=task_id, eta=timezone.now()
     )
+
     notification_bundle.append_notification(alert_group_1, notification_policy)
     notification_bundle.append_notification(alert_group_2, notification_policy)
     notification_bundle.append_notification(alert_group_3, notification_policy)
+
     assert notification_bundle.notifications.filter(bundle_uuid__isnull=True).count() == 3
+
     alert_group_3.resolve()
-    with patch("apps.alerts.tasks.notify_user.compare_escalations", return_value=True):
-        # send notification for 2 active alert groups
-        send_bundled_notification(notification_bundle.id)
-        assert f"alert_group {alert_group_3.id} is not active, skip notification" in caplog.text
-        assert "perform bundled notification for alert groups with ids:" in caplog.text
-        # check bundle_uuid was set, notification for resolved alert group was deleted
-        assert notification_bundle.notifications.filter(bundle_uuid__isnull=True).count() == 0
-        assert notification_bundle.notifications.all().count() == 2
-        assert not notification_bundle.notifications.filter(alert_group=alert_group_3).exists()
-
-        # send notification for 1 active alert group
-        notification_bundle.notifications.update(bundle_uuid=None)
-        alert_group_2.resolve()
-        send_bundled_notification(notification_bundle.id)
-        assert f"alert_group {alert_group_2.id} is not active, skip notification" in caplog.text
-        assert (
-            f"there is only one alert group in bundled notification, perform regular notification. "
-            f"alert_group {alert_group_1.id}"
-        ) in caplog.text
-        # check bundle_uuid was set
-        assert notification_bundle.notifications.filter(bundle_uuid__isnull=True).count() == 0
-        assert notification_bundle.notifications.all().count() == 1
-        # cleanup notifications
-        notification_bundle.notifications.all().delete()
-
-        # send notification for 0 active alert group
-        notification_bundle.append_notification(alert_group_1, notification_policy)
-        alert_group_1.resolve()
-        send_bundled_notification(notification_bundle.id)
-        assert f"alert_group {alert_group_1.id} is not active, skip notification" in caplog.text
-        assert f"no alert groups to notify about or notification is not allowed for user {user.id}" in caplog.text
-        # check all notifications were deleted
-        assert notification_bundle.notifications.all().count() == 0
+
+    # send notification for 2 active alert groups
+    send_bundled_notification.apply((notification_bundle.id,), task_id=task_id)
+
+    assert f"alert_group {alert_group_3.id} is not active, skip notification" in caplog.text
+    assert "perform bundled notification for alert groups with ids:" in caplog.text
+
+    # check bundle_uuid was set, notification for resolved alert group was deleted
+    assert notification_bundle.notifications.filter(bundle_uuid__isnull=True).count() == 0
+    assert notification_bundle.notifications.all().count() == 2
+    assert not notification_bundle.notifications.filter(alert_group=alert_group_3).exists()
+
+    # send notification for 1 active alert group
+    notification_bundle.notifications.update(bundle_uuid=None)
+
+    # since we're calling send_bundled_notification several times within this test, we need to reset task_id
+    # because it gets set to None after the first call
+    notification_bundle.notification_task_id = task_id
+    notification_bundle.save()
+
+    alert_group_2.resolve()
+
+    send_bundled_notification.apply((notification_bundle.id,), task_id=task_id)
+
+    assert f"alert_group {alert_group_2.id} is not active, skip notification" in caplog.text
+    assert (
+        f"there is only one alert group in bundled notification, perform regular notification. "
+        f"alert_group {alert_group_1.id}"
+    ) in caplog.text
+
+    # check bundle_uuid was set
+    assert notification_bundle.notifications.filter(bundle_uuid__isnull=True).count() == 0
+    assert notification_bundle.notifications.all().count() == 1
+
+    # cleanup notifications
+    notification_bundle.notifications.all().delete()
+
+    # send notification for 0 active alert group
+    notification_bundle.append_notification(alert_group_1, notification_policy)
+
+    # since we're calling send_bundled_notification several times within this test, we need to reset task_id
+    # because it gets set to None after the first call
+    notification_bundle.notification_task_id = task_id
+    notification_bundle.save()
+
+    alert_group_1.resolve()
+
+    send_bundled_notification.apply((notification_bundle.id,), task_id=task_id)
+
+    assert f"alert_group {alert_group_1.id} is not active, skip notification" in caplog.text
+    assert f"no alert groups to notify about or notification is not allowed for user {user.id}" in caplog.text
+
+    # check all notifications were deleted
+    assert notification_bundle.notifications.all().count() == 0
 
 
 @pytest.mark.django_db