fix: ONLY fetch apps for the ORGANIZATION (#71036)

App installations were fetching ALL installations for an app.

This was causing requests to timeout via HC

src/sentry/incidents/endpoints/organization_alert_rule_details.py

@@ -58,9 +58,11 @@ def fetch_alert_rule(request: Request, organization, alert_rule):
                     action.get("_sentry_app_installation", {}).get("sentry_app_id", None)
                 )
     if sentry_app_ids:
+        fetched_rpc_installations = app_service.get_many(
+            filter=dict(app_ids=sentry_app_ids, organization_id=organization.id)
+        )
         sentry_app_map = {
-            install.sentry_app.id: install.sentry_app
-            for install in app_service.get_many(filter=dict(app_ids=sentry_app_ids))
+            install.sentry_app.id: install.sentry_app for install in fetched_rpc_installations
         }
 
     # Prepare AlertRuleTriggerActions that are SentryApp components

src/sentry/incidents/models/alert_rule.py

@@ -451,7 +451,7 @@ class AlertRuleTriggerActionManager(BaseManager["AlertRuleTriggerAction"]):
 @region_silo_model
 class AlertRuleTriggerAction(AbstractNotificationAction):
     """
-    This model represents an action that occurs when a trigger is fired. This is
+    This model represents an action that occurs when a trigger (over/under) is fired. This is
     typically some sort of notification.
     """
 

tests/sentry/incidents/endpoints/test_organization_alert_rule_details.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 from copy import deepcopy
 from functools import cached_property
 from typing import Any
+from unittest import mock
 from unittest.mock import patch
 
 import responses
@@ -245,6 +246,79 @@ class AlertRuleDetailsGetEndpointTest(AlertRuleDetailsBase):
         assert "sentry/members" in action["formFields"]["optional_fields"][-1]["uri"]
         assert "bob" == action["formFields"]["optional_fields"][-1]["choices"][0][0]
 
+    @responses.activate
+    def test_with_sentryapp_multiple_installations_filters_by_org(self):
+        self.superuser = self.create_user("admin@localhost", is_superuser=True)
+        self.login_as(user=self.superuser)
+        self.create_team(organization=self.organization, members=[self.superuser])
+
+        org2 = self.create_organization(name="org2")
+
+        sentry_app = self.create_sentry_app(
+            organization=self.organization,
+            published=True,
+            verify_install=False,
+            name="Super Awesome App",
+            schema={"elements": [self.create_alert_rule_action_schema()]},
+        )
+        self.create_sentry_app_installation(
+            slug=sentry_app.slug, organization=self.organization, user=self.superuser
+        )
+        self.create_sentry_app_installation(
+            slug=sentry_app.slug, organization=org2, user=self.superuser
+        )
+
+        getmany_response = app_service.get_many(
+            filter=dict(app_ids=[sentry_app.id], organization_id=self.organization.id)
+        )
+
+        rule = self.create_alert_rule()
+        trigger = self.create_alert_rule_trigger(rule, "hi", 1000)
+        self.create_alert_rule_trigger_action(
+            alert_rule_trigger=trigger,
+            target_identifier=sentry_app.id,
+            type=AlertRuleTriggerAction.Type.SENTRY_APP,
+            target_type=AlertRuleTriggerAction.TargetType.SENTRY_APP,
+            sentry_app=sentry_app,
+            sentry_app_config=[
+                {"name": "title", "value": "An alert"},
+                {"summary": "Something happened here..."},
+                {"name": "points", "value": "3"},
+                {"name": "assignee", "value": "Nisanthan"},
+            ],
+        )
+
+        responses.add(
+            responses.GET,
+            "https://example.com/sentry/members",
+            json=[
+                {"value": "bob", "label": "Bob"},
+                {"value": "jess", "label": "Jess"},
+            ],
+            status=200,
+        )
+        with self.feature("organizations:incidents"):
+            with mock.patch.object(app_service, "get_many") as mock_get_many:
+                mock_get_many.return_value = getmany_response
+                resp = self.get_response(self.organization.slug, rule.id)
+
+                assert mock_get_many.call_count == 1
+                mock_get_many.assert_called_with(
+                    filter={
+                        "app_ids": [sentry_app.id],
+                        "organization_id": self.organization.id,
+                    },
+                )
+
+        assert resp.status_code == 200
+        assert len(responses.calls) == 1
+        assert "errors" not in resp.data
+
+        action = resp.data["triggers"][0]["actions"][0]
+        assert "select" == action["formFields"]["optional_fields"][-1]["type"]
+        assert "sentry/members" in action["formFields"]["optional_fields"][-1]["uri"]
+        assert "bob" == action["formFields"]["optional_fields"][-1]["choices"][0][0]
+
     @responses.activate
     def test_with_unresponsive_sentryapp(self):
         self.superuser = self.create_user("admin@localhost", is_superuser=True)