fix: instrumentation entries should not contain user labels (#703)

Author: daniel-sanche

google/cloud/logging_v2/_instrumentation.py

@@ -67,8 +67,10 @@ def _create_diagnostic_entry(name=_PYTHON_LIBRARY_NAME, version=_LIBRARY_VERSION
             _INSTRUMENTATION_SOURCE_KEY: [_get_instrumentation_source(name, version)]
         }
     }
-    kw["severity"] = "INFO"
-    entry = StructEntry(payload=payload, **kw)
+    # only keep the log_name and resource from the parent log
+    allow_list = ("log_name", "resource")
+    active_kws = {k: v for k, v in kw.items() if k in allow_list}
+    entry = StructEntry(payload=payload, **active_kws)
     return entry
 
 

tests/unit/test__instrumentation.py

@@ -63,3 +63,19 @@ def test_truncate_long_values(self):
 
         self.assertEqual(expected_name, self._get_diagonstic_value(entry, "name"))
         self.assertEqual(expected_version, self._get_diagonstic_value(entry, "version"))
+
+    def test_drop_labels(self):
+        """Labels should not be copied in instrumentation log"""
+        test_logname = "test-name"
+        test_labels = {"hello": "world"}
+        entry = i._create_diagnostic_entry(
+            name=self.LONG_NAME,
+            version=self.LONG_VERSION,
+            log_name=test_logname,
+            labels=test_labels,
+        )
+        self.assertEqual(entry.log_name, test_logname)
+        self.assertIsNone(entry.labels)
+        # ensure only expected fields exist in entry
+        expected_keys = set(["logName", "resource", "jsonPayload"])
+        self.assertEqual(set(entry.to_api_repr().keys()), expected_keys)