Activated alert rule apis feature flag (#66361)

Includes feature flag and monitor type validator in the alert rule api
serializer

Serializer converts int value into enum

src/sentry/conf/server.py

@@ -1455,6 +1455,8 @@ def custom_parameter_sort(parameter: dict) -> tuple[str, int]:
     "auth:enterprise-superuser-read-write": False,
     # Enables user registration.
     "auth:register": True,
+    # Enables activated alert rules
+    "organizations:activated-alert-rules": False,
     # Enable advanced search features, like negation and wildcard matching.
     "organizations:advanced-search": True,
     # Enables alert creation on indexed events in UI (use for PoC/testing only)

src/sentry/features/__init__.py

@@ -70,6 +70,7 @@
 default_manager.add("relocation:enabled", SystemFeature, FeatureHandlerStrategy.INTERNAL)
 
 # Organization scoped features that are in development or in customer trials.
+default_manager.add("organizations:activated-alert-rules", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:alert-allow-indexed", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:alert-crash-free-metrics", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:alert-filters", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)

src/sentry/incidents/serializers/alert_rule.py

@@ -26,7 +26,12 @@
     translate_aggregate_field,
     update_alert_rule,
 )
-from sentry.incidents.models import AlertRule, AlertRuleThresholdType, AlertRuleTrigger
+from sentry.incidents.models import (
+    AlertRule,
+    AlertRuleMonitorType,
+    AlertRuleThresholdType,
+    AlertRuleTrigger,
+)
 from sentry.snuba.dataset import Dataset
 from sentry.snuba.entity_subscription import (
     ENTITY_TIME_COLUMNS,
@@ -196,6 +201,16 @@ def validate_threshold_type(self, threshold_type):
                 % [item.value for item in AlertRuleThresholdType]
             )
 
+    def validate_monitor_type(self, monitor_type):
+        if monitor_type > 0 and not features.has(
+            "organizations:activated-alert-rules",
+            self.context["organization"],
+            actor=self.context.get("user", None),
+        ):
+            raise serializers.ValidationError("Invalid monitor type")
+
+        return AlertRuleMonitorType(monitor_type)
+
     def validate(self, data):
         """
         Performs validation on an alert rule's data.