Fix SSA validation errors: remove nulls and fix test path

1. Add _remove_null_values() to recursively strip null values from
   objects before SSA - Kubernetes rejects nulls where objects are
   expected in the CRD schema (e.g., spec.security: null → 422 error)

2. Fix test_appdb_reconcile to use correct schema path:
   - Wrong: spec.applicationDatabase.logLevel
   - Correct: spec.applicationDatabase.agent.logLevel
   This was a latent bug exposed by SSA's strict schema validation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: nammn

docker/mongodb-kubernetes-tests/kubeobject/customobject.py

@@ -9,13 +9,27 @@
 from kubernetes.dynamic import DynamicClient
 
 
+def _remove_null_values(obj):
+    """Recursively remove keys with None/null values from a dict.
+
+    SSA rejects null values where objects are expected in the schema.
+    """
+    if isinstance(obj, dict):
+        return {k: _remove_null_values(v) for k, v in obj.items() if v is not None}
+    elif isinstance(obj, list):
+        return [_remove_null_values(item) for item in obj]
+    return obj
+
+
 def _strip_server_managed_fields(obj: Dict) -> Dict:
     """Strip server-managed fields from object before server-side apply.
 
     Server-side apply (SSA) will reject requests that include certain
     server-managed fields. These fields are automatically added by the
     server when an object is created/updated and should not be sent
     back in SSA requests.
+
+    Also removes null values which SSA rejects where objects are expected.
     """
     result = copy.deepcopy(obj)
 
@@ -35,6 +49,9 @@ def _strip_server_managed_fields(obj: Dict) -> Dict:
         ]:
             metadata.pop(field, None)
 
+    # Remove null values - SSA rejects nulls where objects are expected
+    result = _remove_null_values(result)
+
     return result
 
 

docker/mongodb-kubernetes-tests/tests/opsmanager/om_ops_manager_upgrade.py

@@ -381,7 +381,7 @@ def test_agents_upgraded(self, mdb: MongoDB, ops_manager: MongoDBOpsManager, cus
 class TestAppDBScramShaUpdated:
     def test_appdb_reconcile(self, ops_manager: MongoDBOpsManager):
         ops_manager.load()
-        ops_manager["spec"]["applicationDatabase"]["logLevel"] = "DEBUG"
+        ops_manager["spec"]["applicationDatabase"]["agent"]["logLevel"] = "DEBUG"
         ops_manager.update()
 
         ops_manager.appdb_status().assert_reaches_phase(Phase.Running)