use json.dumps for logging (#37140)

src/sentry/api/endpoints/organization_vitals_overview.py

@@ -15,6 +15,7 @@ from sentry.api.bases import OrganizationEventsEndpointBase
 from sentry.api.serializers.models.project import get_access_by_project
 from sentry.models import Organization, Project, ProjectStatus
 from sentry.snuba import discover
+from sentry.utils import json
 
 logger = logging.getLogger(__name__)
 
@@ -80,8 +81,8 @@ def get_vital_data_for_org_no_cache(organization: Organization, projects: Sequen
             {
                 "organization_id": organization.id,
                 "num_projects": len(projects),
-                "columns": columns,
-                "data": result["data"],
+                "columns": json.dumps(columns),
+                "data": json.dumps(result["data"]),
             },
         )
         return result["data"]