fix(cache): retain exception names in redacted tracebacks

Signed-off-by: LeizhenZhang <zhangleizhen645@gmail.com>

litellm/caching/redis_cache.py

@@ -555,7 +555,9 @@ def log_redis_failure(
     if isinstance(exc, RedisCircuitBreakerOpenError):
         logger.debug("%s: %s", message, reason, stacklevel=2)
         return
-    exc_info: Final = (type(exc), Exception(reason), exc.__traceback__) if with_traceback else None
+    exc_info: Final = (
+        (Exception, Exception(f"{type(exc).__name__}: {reason}"), exc.__traceback__) if with_traceback else None
+    )
     if not is_redis_timeout_failure(exc):
         logger.log(level, "%s: %s", message, reason, exc_info=exc_info, stacklevel=2)
         return

tests/unit/caching/test_redis_cache.py

@@ -1784,6 +1784,7 @@ def test_log_redis_failure_redacts_traceback_and_exception_chain(
     assert SENSITIVE_CACHE_KEY not in caplog.text
     assert "private customer message" not in caplog.text
     assert "Traceback (most recent call last)" in caplog.text
+    assert ("RuntimeError" if chained else "ResponseError") in caplog.text
     assert "Redis failed" in caplog.text