chore: import upstream snapshot with attribution

python/ray/llm/_internal/common/errors.py

@@ -0,0 +1,14 @@
+"""Fatal engine error definitions shared by serve and batch layers."""
+
+from typing import Tuple, Type
+
+# vLLM fatal errors that should always be re-raised, never swallowed.
+# EngineDeadError indicates the vLLM engine process has crashed and is
+# unrecoverable — all subsequent requests would fail anyway.
+VLLM_FATAL_ERRORS: Tuple[Type[Exception], ...] = ()
+try:
+    from vllm.v1.engine.exceptions import EngineDeadError
+
+    VLLM_FATAL_ERRORS = (EngineDeadError,)
+except ImportError:
+    pass