feat: add GraphEngine layer node execution hooks (#28583)

api/extensions/otel/decorators/base.py

@@ -1,5 +1,4 @@
 import functools
-import os
 from collections.abc import Callable
 from typing import Any, TypeVar, cast
 
@@ -7,22 +6,13 @@ from opentelemetry.trace import get_tracer
 
 from configs import dify_config
 from extensions.otel.decorators.handler import SpanHandler
+from extensions.otel.runtime import is_instrument_flag_enabled
 
 T = TypeVar("T", bound=Callable[..., Any])
 
 _HANDLER_INSTANCES: dict[type[SpanHandler], SpanHandler] = {SpanHandler: SpanHandler()}
 
 
-def _is_instrument_flag_enabled() -> bool:
-    """
-    Check if external instrumentation is enabled via environment variable.
-
-    Third-party non-invasive instrumentation agents set this flag to coordinate
-    with Dify's manual OpenTelemetry instrumentation.
-    """
-    return os.getenv("ENABLE_OTEL_FOR_INSTRUMENT", "").strip().lower() == "true"
-
-
 def _get_handler_instance(handler_class: type[SpanHandler]) -> SpanHandler:
     """Get or create a singleton instance of the handler class."""
     if handler_class not in _HANDLER_INSTANCES:
@@ -43,7 +33,7 @@ def trace_span(handler_class: type[SpanHandler] | None = None) -> Callable[[T],
     def decorator(func: T) -> T:
         @functools.wraps(func)
         def wrapper(*args: Any, **kwargs: Any) -> Any:
-            if not (dify_config.ENABLE_OTEL or _is_instrument_flag_enabled()):
+            if not (dify_config.ENABLE_OTEL or is_instrument_flag_enabled()):
                 return func(*args, **kwargs)
 
             handler = _get_handler_instance(handler_class or SpanHandler)