fix: remove traceback key instead of it being ""

litellm/proxy/hooks/proxy_track_cost_callback.py

@@ -83,7 +83,14 @@ class _ProxyDBLogger(CustomLogger):
             traceback_str=traceback_str,
         )
         if should_suppress_spend_log_tracebacks():
-            _error_information = {**_error_information, "traceback": ""}
+            # Drop the traceback key entirely so the per-row Metadata pane in
+            # the UI (which renders the JSON blob verbatim) doesn't show a
+            # noisy ``"traceback": ""`` line. Downstream consumers all use
+            # ``.get("traceback")`` / truthy checks, and the TypedDict marks
+            # the field as optional, so omitting is type-safe.
+            _error_information = {
+                k: v for k, v in _error_information.items() if k != "traceback"
+            }
         _metadata["error_information"] = _error_information
 
         _metadata = await _ProxyDBLogger._enrich_failure_metadata_with_key_info(

litellm/proxy/spend_tracking/spend_log_error_logger.py

@@ -12,9 +12,12 @@ The opt-in is a single env var, ``LITELLM_SUPPRESS_SPEND_LOG_TRACEBACKS=true``,
 gated by ``should_suppress_spend_log_tracebacks``. When it returns ``True``:
   * ``spend_log_error`` drops the traceback from the console / structured log
     record (this module), and
-  * the failure callback in ``proxy_track_cost_callback`` blanks the
-    ``error_information.traceback`` field on the SpendLogs row before it is
-    persisted, so the UI's per-row Metadata pane stays clean.
+  * the failure callback in ``proxy_track_cost_callback`` drops the
+    ``error_information.traceback`` field from the SpendLogs row before it is
+    persisted, so the UI's per-row Metadata pane (which renders the metadata
+    JSON verbatim) stays clean. The key is omitted entirely rather than set
+    to ``""`` — ``StandardLoggingPayloadErrorInformation`` marks the field
+    optional and every downstream consumer uses ``.get("traceback")``.
 
 At DEBUG the full traceback is always preserved so operators can still
 troubleshoot. The UI suppression follows the same gate.

tests/test_litellm/proxy/hooks/test_proxy_track_cost_callback.py

@@ -1043,12 +1043,14 @@ async def test_failure_hook_keeps_error_information_traceback_by_default(monkeyp
 
 
 @pytest.mark.asyncio
-async def test_failure_hook_blanks_error_information_traceback_when_env_set(
+async def test_failure_hook_drops_error_information_traceback_when_env_set(
     monkeypatch,
 ):
-    """With the opt-in env var, the traceback in the SpendLogs row is blanked
-    so the per-row Metadata pane in the UI stays clean. The other fields
-    (error_class / error_message / error_code) are preserved."""
+    """With the opt-in env var, the traceback key is omitted from the
+    SpendLogs row entirely so the per-row Metadata pane in the UI (which
+    renders ``error_information`` as a JSON blob) doesn't show a noisy empty
+    ``"traceback": ""`` line. The other fields (error_class / error_message /
+    error_code) are preserved."""
     import logging
 
     from litellm._logging import verbose_proxy_logger
@@ -1062,6 +1064,6 @@ async def test_failure_hook_blanks_error_information_traceback_when_env_set(
         verbose_proxy_logger.setLevel(original_level)
 
     error_information = metadata["error_information"]
-    assert error_information["traceback"] == ""
+    assert "traceback" not in error_information
     assert error_information["error_class"] == "RuntimeError"
     assert error_information["error_message"] == "boom-with-traceback"