chore: import upstream snapshot with attribution

python/ray/util/tracing/setup_local_tmp_tracing.py

@@ -0,0 +1,26 @@
+import os
+
+from opentelemetry import trace
+from opentelemetry.sdk.trace import TracerProvider
+from opentelemetry.sdk.trace.export import (
+    ConsoleSpanExporter,
+    SimpleSpanProcessor,
+)
+
+spans_dir = "/tmp/spans/"
+
+
+def setup_tracing() -> None:
+    """Stand-in for a user-provided `setup_tracing` hook."""
+    os.makedirs("/tmp/spans", exist_ok=True)
+    # Sets the tracer_provider. This is only allowed once per execution
+    # context and will log a warning if attempted multiple times.
+    trace.set_tracer_provider(TracerProvider())
+    trace.get_tracer_provider().add_span_processor(
+        SimpleSpanProcessor(
+            ConsoleSpanExporter(
+                out=open(f"{spans_dir}{os.getpid()}.txt", "w"),
+                formatter=lambda span: span.to_json(indent=None) + os.linesep,
+            )
+        )
+    )