fix(merged-issues): Update grouphash endpoint to use simple serializer (#81017)

Switching to a simple serializer for the grouphash endpoint. This
endpoint is used to load the merged-issues page on an issue and doesn't
need to gather all the extra info (stacktrace, packages, tags, etc)
about all events in order to populate the page.

Fixes #80961

Author: snigdhas

src/sentry/api/serializers/models/event.py

@@ -586,6 +586,7 @@ def serialize(self, obj, attrs, user, **kwargs):
         "platform": str,
         "dateCreated": datetime,
         "crashFile": str | None,
+        "metadata": dict[str, Any] | None,
     },
 )
 
@@ -642,6 +643,7 @@ def serialize(self, obj: BaseEvent, attrs, user, **kwargs) -> SimpleEventSeriali
             "dateCreated": obj.datetime,
             # Needed to generate minidump links in UI
             "crashFile": attrs["crash_file"],
+            "metadata": obj.get_event_metadata(),
         }
 
         return response

src/sentry/apidocs/examples/event_examples.py

@@ -28,6 +28,7 @@
     "location": "example.py:123",
     "culprit": "/books/new/",
     "projectID": "49271",
+    "metadata": None,
 }
 
 GROUP_EVENT: GroupEventDetailsResponse = {

src/sentry/issues/endpoints/group_hashes.py

@@ -8,7 +8,7 @@
 from sentry.api.base import region_silo_endpoint
 from sentry.api.bases import GroupEndpoint
 from sentry.api.paginator import GenericOffsetPaginator
-from sentry.api.serializers import EventSerializer, serialize
+from sentry.api.serializers import EventSerializer, SimpleEventSerializer, serialize
 from sentry.models.grouphash import GroupHash
 from sentry.tasks.unmerge import unmerge
 from sentry.utils import metrics
@@ -31,8 +31,10 @@ def get(self, request: Request, group) -> Response:
         checksums used to aggregate individual events.
 
         :pparam string issue_id: the ID of the issue to retrieve.
+        :pparam bool full: If this is set to true, the event payload will include the full event body, including the stacktrace.
         :auth: required
         """
+        full = request.GET.get("full", True)
 
         data_fn = partial(
             lambda *args, **kwargs: raw_query(*args, **kwargs)["data"],
@@ -47,7 +49,9 @@ def get(self, request: Request, group) -> Response:
             tenant_ids={"organization_id": group.project.organization_id},
         )
 
-        handle_results = partial(self.__handle_results, group.project_id, group.id, request.user)
+        handle_results = partial(
+            self.__handle_results, group.project_id, group.id, request.user, full
+        )
 
         return self.paginate(
             request=request,
@@ -90,13 +94,16 @@ def put(self, request: Request, group) -> Response:
 
         return Response(status=202)
 
-    def __handle_results(self, project_id, group_id, user, results):
-        return [self.__handle_result(user, project_id, group_id, result) for result in results]
+    def __handle_results(self, project_id, group_id, user, full, results):
+        return [
+            self.__handle_result(user, project_id, group_id, full, result) for result in results
+        ]
 
-    def __handle_result(self, user, project_id, group_id, result):
+    def __handle_result(self, user, project_id, group_id, full, result):
         event = eventstore.backend.get_event_by_id(project_id, result["event_id"])
 
+        serializer = EventSerializer if full else SimpleEventSerializer
         return {
             "id": result["primary_hash"],
-            "latestEvent": serialize(event, user, EventSerializer()),
+            "latestEvent": serialize(event, user, serializer()),
         }