Allow email to be a list instead of a string

core/dbt/artifacts/resources/v1/owner.py

@@ -1,10 +1,10 @@
 from dataclasses import dataclass
-from typing import Optional
+from typing import List, Optional, Union
 
 from dbt_common.contracts.config.properties import AdditionalPropertiesAllowed
 
 
 @dataclass
 class Owner(AdditionalPropertiesAllowed):
-    email: Optional[str] = None
+    email: Union[str, List[str], None] = None
     name: Optional[str] = None

core/dbt/contracts/graph/nodes.py

@@ -1531,7 +1531,7 @@ def to_logging_dict(self) -> Dict[str, Union[str, Dict[str, str]]]:
         return {
             "name": self.name,
             "package_name": self.package_name,
-            "owner": self.owner.to_dict(omit_none=True),
+            "owner": {k: str(v) for k, v in self.owner.to_dict(omit_none=True).items()},
         }
 
 

tests/functional/logging/test_logging.py

@@ -119,6 +119,27 @@ def test_invalid_event_value(project, logs_dir):
     access: public
 """
 
+groups_yml_with_multiple_emails = """
+groups:
+  - name: my_group_with_owner_metadata
+    owner:
+      name: my_name
+      email:
+        - [email protected]
+        - [email protected]
+      slack: my_slack
+      other_property: something_else
+
+models:
+  - name: my_model
+    group: my_group_with_owner_metadata
+    access: public
+    columns:
+      - name: my_column
+        tests:
+         - not_null
+"""
+
 
 class TestRunResultErrorNodeInfo:
     @pytest.fixture(scope="class")
@@ -289,3 +310,41 @@ def models(self):
     def test_node_info_on_results(self, project, logs_dir):
         results = run_dbt(["--no-write-json", "run"])
         assert len(results) == 1
+
+
+class TestRunResultGroupWithMultipleEmails:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "my_model.sql": "select 1 as id, null as my_column",
+            "groups.yml": groups_yml_with_multiple_emails,
+        }
+
+    def test_node_info_on_results(self, project, logs_dir):
+        results = run_dbt(["--log-format=json", "build"], expect_pass=False)
+        assert len(results) == 2
+
+        log_file = read_file(logs_dir, "dbt.log")
+        run_result_error_count = 0
+
+        for log_line in log_file.split("\n"):
+            if not log_line:
+                continue
+
+            log_json = json.loads(log_line)
+            if log_json["info"]["level"] == EventLevel.DEBUG:
+                continue
+
+            if log_json["info"]["name"] == "RunResultError":
+                assert "group" in log_json["data"]
+                group_data = log_json["data"]["group"]
+                assert group_data["name"] == "my_group_with_owner_metadata"
+                assert group_data["owner"] == {
+                    "name": "my_name",
+                    "email": "['[email protected]', '[email protected]']",
+                    "slack": "my_slack",
+                    "other_property": "something_else",
+                }
+                run_result_error_count += 1
+
+        assert run_result_error_count == 1