add env var to disable runtime tracing

python/packages/autogen-core/src/autogen_core/_telemetry/_tracing.py

@@ -1,4 +1,5 @@
 import contextlib
+import os
 from typing import Dict, Generic, Iterator, Optional
 
 from opentelemetry.trace import NoOpTracerProvider, Span, SpanKind, TracerProvider, get_tracer_provider
@@ -22,11 +23,18 @@ def __init__(
         tracer_provider: TracerProvider | None,
         instrumentation_builder_config: TracingConfig[Operation, Destination, ExtraAttributes],
     ) -> None:
+        self.instrumentation_builder_config = instrumentation_builder_config
+
+        disable_runtime_tracing = os.environ.get("AUTOGEN_DISABLE_RUNTIME_TRACING")
+        if disable_runtime_tracing:
+            self.tracer_provider = NoOpTracerProvider()
+            self.tracer = self.tracer_provider.get_tracer(f"autogen {instrumentation_builder_config.name}")
+            return
+
         # Evaluate in order: first try tracer_provider param, then get_tracer_provider(), finally fallback to NoOp
         # This allows for nested tracing with a default tracer provided by the user
         self.tracer_provider = tracer_provider or get_tracer_provider() or NoOpTracerProvider()
         self.tracer = self.tracer_provider.get_tracer(f"autogen {instrumentation_builder_config.name}")
-        self.instrumentation_builder_config = instrumentation_builder_config
 
     @contextlib.contextmanager
     def trace_block(