add is_restricted column to alert_group table (#2289)

# What this PR does

Plus mark `alert_receive_channel.restricted_at` column as deprecated.
This column will be removed in a future release.

## 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)

engine/apps/alerts/migrations/0017_alertgroup_is_restricted.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.19 on 2023-06-19 12:40
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('alerts', '0016_auto_20230523_1355'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='alertgroup',
+            name='is_restricted',
+            field=models.BooleanField(default=False, null=True),
+        ),
+    ]

engine/apps/alerts/models/alert_group.py

@@ -365,12 +365,7 @@ class AlertGroup(AlertGroupSlackRenderingMixin, EscalationSnapshotMixin, models.
     # https://code.djangoproject.com/ticket/28545
     is_open_for_grouping = models.BooleanField(default=None, null=True, blank=True)
 
-    @property
-    def is_restricted(self):
-        integration_restricted_at = self.channel.restricted_at
-        if integration_restricted_at is None:
-            return False
-        return self.started_at >= integration_restricted_at
+    is_restricted = models.BooleanField(default=False, null=True)
 
     @staticmethod
     def get_silenced_state_filter():

engine/apps/alerts/models/alert_receive_channel.py

@@ -192,6 +192,7 @@ class AlertReceiveChannel(IntegrationOptionsMixin, MaintainableObject):
     rate_limited_in_slack_at = models.DateTimeField(null=True, default=None)
     rate_limit_message_task_id = models.CharField(max_length=100, null=True, default=None)
 
+    # TODO: remove this field after AlertGroup.is_restricted change has been released
     restricted_at = models.DateTimeField(null=True, default=None)
 
     class Meta:

engine/apps/user_management/models/organization.py

@@ -64,6 +64,7 @@ class OrganizationManager(models.Manager):
 
 
 class Organization(MaintainableObject):
+
     objects = OrganizationManager()
     objects_with_deleted = models.Manager()