feat(crons): Start dual writing DataSource and Detector rows for crons (#97542)

We want to have these rows available so that we can start linking crons
to workflows.

<!-- Describe your PR here. -->

Author: wedamija

src/sentry/monitors/consumers/monitor_consumer.py

@@ -70,6 +70,7 @@
 from sentry.monitors.system_incidents import update_check_in_volume
 from sentry.monitors.types import CheckinItem
 from sentry.monitors.utils import (
+    ensure_cron_detector,
     get_new_timeout_at,
     get_timeout_at,
     signal_first_checkin,
@@ -165,6 +166,7 @@ def _ensure_monitor_with_config(
                 "is_upserting": True,
             },
         )
+        ensure_cron_detector(monitor)
         if created:
             signal_monitor_created(project, None, True, monitor, None)
 

src/sentry/monitors/endpoints/organization_monitor_index.py

@@ -47,7 +47,11 @@
     MonitorSerializer,
     MonitorSerializerResponse,
 )
-from sentry.monitors.utils import create_issue_alert_rule, signal_monitor_created
+from sentry.monitors.utils import (
+    create_issue_alert_rule,
+    ensure_cron_detector,
+    signal_monitor_created,
+)
 from sentry.monitors.validators import MonitorBulkEditValidator, MonitorValidator
 from sentry.search.utils import tokenize_query
 from sentry.types.actor import Actor
@@ -291,6 +295,8 @@ def post(self, request: AuthenticatedHttpRequest, organization) -> Response:
         except MonitorLimitsExceeded as e:
             return self.respond({type(e).__name__: str(e)}, status=403)
 
+        ensure_cron_detector(monitor)
+
         # Attempt to assign a seat for this monitor
         seat_outcome = quotas.backend.assign_monitor_seat(monitor)
         if seat_outcome != Outcome.ACCEPTED:

src/sentry/monitors/utils.py

@@ -1,3 +1,4 @@
+import logging
 from collections import defaultdict
 from datetime import datetime, timedelta
 
@@ -13,6 +14,7 @@
 from sentry.models.rule import Rule, RuleActivity, RuleActivityType, RuleSource
 from sentry.monitors.constants import DEFAULT_CHECKIN_MARGIN, MAX_TIMEOUT, TIMEOUT
 from sentry.monitors.models import CheckInStatus, Monitor, MonitorCheckIn
+from sentry.monitors.types import DATA_SOURCE_CRON_MONITOR
 from sentry.projects.project_rules.creator import ProjectRuleCreator
 from sentry.projects.project_rules.updater import ProjectRuleUpdater
 from sentry.signals import (
@@ -23,7 +25,11 @@
 from sentry.users.models.user import User
 from sentry.utils.audit import create_audit_entry, create_system_audit_entry
 from sentry.utils.auth import AuthenticatedHttpRequest
+from sentry.utils.db import atomic_transaction
 from sentry.utils.projectflags import set_project_flag_and_signal
+from sentry.workflow_engine.models import DataSource, DataSourceDetector, Detector
+
+logger = logging.getLogger(__name__)
 
 
 def signal_first_checkin(project: Project, monitor: Monitor):
@@ -383,3 +389,26 @@ def update_issue_alert_rule(
         )
 
     return issue_alert_rule.id
+
+
+def ensure_cron_detector(monitor: Monitor):
+    from sentry.issues.grouptype import MonitorCheckInFailure
+
+    try:
+        with atomic_transaction(using=router.db_for_write(DataSource)):
+            data_source, created = DataSource.objects.get_or_create(
+                type=DATA_SOURCE_CRON_MONITOR,
+                organization_id=monitor.organization_id,
+                source_id=str(monitor.id),
+            )
+            if created:
+                detector = Detector.objects.create(
+                    type=MonitorCheckInFailure.slug,
+                    project_id=monitor.project_id,
+                    name=monitor.name,
+                    owner_user_id=monitor.owner_user_id,
+                    owner_team_id=monitor.owner_team_id,
+                )
+                DataSourceDetector.objects.create(data_source=data_source, detector=detector)
+    except Exception:
+        logger.exception("Error creating cron detector")

tests/sentry/monitors/consumers/test_monitor_consumer.py

@@ -29,13 +29,14 @@
     ScheduleType,
 )
 from sentry.monitors.processing_errors.errors import ProcessingErrorsException, ProcessingErrorType
-from sentry.monitors.types import CheckinItem
+from sentry.monitors.types import DATA_SOURCE_CRON_MONITOR, CheckinItem
 from sentry.testutils.asserts import assert_org_audit_log_exists
 from sentry.testutils.cases import TestCase
 from sentry.testutils.helpers.options import override_options
 from sentry.testutils.outbox import outbox_runner
 from sentry.utils import json
 from sentry.utils.outcomes import Outcome
+from sentry.workflow_engine.models import Detector
 
 
 class ExpectNoProcessingError:
@@ -572,6 +573,10 @@ def test_monitor_create(self) -> None:
             monitor_environment.next_checkin_latest
             == monitor_environment.monitor.get_next_expected_checkin_latest(checkin.date_added)
         )
+        assert Detector.objects.filter(
+            datasource__type=DATA_SOURCE_CRON_MONITOR,
+            datasource__source_id=str(monitor_environment.monitor_id),
+        ).exists()
 
     def test_monitor_create_owner(self) -> None:
         self.send_checkin(

tests/sentry/monitors/endpoints/test_organization_monitor_index.py

@@ -12,12 +12,14 @@
 from sentry.constants import ObjectStatus
 from sentry.models.rule import Rule, RuleSource
 from sentry.monitors.models import Monitor, MonitorStatus, ScheduleType
+from sentry.monitors.types import DATA_SOURCE_CRON_MONITOR
 from sentry.quotas.base import SeatAssignmentResult
 from sentry.slug.errors import DEFAULT_SLUG_ERROR_MESSAGE
 from sentry.testutils.asserts import assert_org_audit_log_exists
 from sentry.testutils.cases import MonitorTestCase
 from sentry.testutils.outbox import outbox_runner
 from sentry.utils.outcomes import Outcome
+from sentry.workflow_engine.models import Detector
 
 
 class ListOrganizationMonitorsTest(MonitorTestCase):
@@ -402,6 +404,11 @@ def test_simple(self, mock_record: MagicMock) -> None:
             data={"upsert": False, **monitor.get_audit_log_data()},
         )
 
+        assert Detector.objects.filter(
+            datasource__type=DATA_SOURCE_CRON_MONITOR,
+            datasource__source_id=str(monitor.id),
+        ).exists()
+
         self.project.refresh_from_db()
         assert self.project.flags.has_cron_monitors
 

tests/sentry/monitors/test_utils.py

@@ -0,0 +1,120 @@
+from unittest.mock import patch
+
+from django.db import IntegrityError
+
+from sentry.issues.grouptype import MonitorIncidentType
+from sentry.monitors.types import DATA_SOURCE_CRON_MONITOR
+from sentry.monitors.utils import ensure_cron_detector
+from sentry.testutils.cases import TestCase
+from sentry.workflow_engine.models import DataSource, DataSourceDetector, Detector
+
+
+class EnsureCronDetectorTest(TestCase):
+    def setUp(self):
+        super().setUp()
+        self.monitor = self.create_monitor(owner_user_id=None)
+
+    def test_creates_data_source_and_detector_for_new_monitor(self):
+        assert not DataSource.objects.filter(
+            type=DATA_SOURCE_CRON_MONITOR,
+            organization_id=self.monitor.organization_id,
+            source_id=str(self.monitor.id),
+        ).exists()
+
+        ensure_cron_detector(self.monitor)
+        data_source = DataSource.objects.get(
+            type=DATA_SOURCE_CRON_MONITOR,
+            organization_id=self.monitor.organization_id,
+            source_id=str(self.monitor.id),
+        )
+        assert data_source is not None
+        detector = Detector.objects.get(
+            type=MonitorIncidentType.slug,
+            project_id=self.monitor.project_id,
+            name=self.monitor.name,
+        )
+        assert detector is not None
+        assert detector.owner_user_id == self.monitor.owner_user_id
+        assert detector.owner_team_id == self.monitor.owner_team_id
+        assert DataSourceDetector.objects.filter(
+            data_source=data_source,
+            detector=detector,
+        ).exists()
+
+    def test_idempotent_for_existing_data_source(self):
+        ensure_cron_detector(self.monitor)
+        data_source = DataSource.objects.get(
+            type=DATA_SOURCE_CRON_MONITOR,
+            organization_id=self.monitor.organization_id,
+            source_id=str(self.monitor.id),
+        )
+        detector = Detector.objects.get(
+            type=MonitorIncidentType.slug,
+            project_id=self.monitor.project_id,
+            name=self.monitor.name,
+        )
+        link = DataSourceDetector.objects.get(
+            data_source=data_source,
+            detector=detector,
+        )
+        ensure_cron_detector(self.monitor)
+        data_source_after = DataSource.objects.get(
+            type=DATA_SOURCE_CRON_MONITOR,
+            organization_id=self.monitor.organization_id,
+            source_id=str(self.monitor.id),
+        )
+        detector_after = Detector.objects.get(
+            type=MonitorIncidentType.slug,
+            project_id=self.monitor.project_id,
+            name=self.monitor.name,
+        )
+        link_after = DataSourceDetector.objects.get(
+            data_source=data_source,
+            detector=detector,
+        )
+        assert data_source.id == data_source_after.id
+        assert detector.id == detector_after.id
+        assert link.id == link_after.id
+
+    def test_with_owner_user(self):
+        self.monitor.owner_user_id = self.user.id
+        self.monitor.save()
+        ensure_cron_detector(self.monitor)
+        detector = Detector.objects.get(
+            type=MonitorIncidentType.slug,
+            project_id=self.monitor.project_id,
+        )
+        assert detector.owner_user_id == self.user.id
+        assert detector.owner_team_id is None
+
+    def test_with_no_owner(self):
+        ensure_cron_detector(self.monitor)
+
+        detector = Detector.objects.get(
+            type=MonitorIncidentType.slug,
+            project_id=self.monitor.project_id,
+        )
+        assert detector.owner_user_id is None
+        assert detector.owner_team_id is None
+
+    def test_handles_database_errors_gracefully(self):
+        with (
+            patch("sentry.monitors.utils.logger") as mock_logger,
+            patch("sentry.monitors.utils.DataSource.objects.get_or_create") as mock_get_or_create,
+        ):
+            mock_get_or_create.side_effect = IntegrityError("Database error")
+
+            ensure_cron_detector(self.monitor)
+            mock_logger.exception.assert_called_once_with("Error creating cron detector")
+        assert not DataSource.objects.filter(
+            type=DATA_SOURCE_CRON_MONITOR, source_id=str(self.monitor.id)
+        ).exists()
+
+    def test_atomic_transaction_rollback(self):
+        with patch("sentry.monitors.utils.Detector.objects.create") as mock_create:
+            mock_create.side_effect = IntegrityError("Cannot create detector")
+
+            ensure_cron_detector(self.monitor)
+        assert not DataSource.objects.filter(
+            type=DATA_SOURCE_CRON_MONITOR, source_id=str(self.monitor.id)
+        ).exists()