feat(enterprise): Add OTEL telemetry with slim traces, metrics, and structured logs

- Add EnterpriseOtelTrace handler with span emission for workflows and nodes
- Implement minimal-span strategy: slim spans + detailed companion logs
- Add deterministic span/trace IDs for cross-workflow trace correlation
- Add metric collection at 100% accuracy (counters & histograms)
- Add event handlers for app lifecycle and feedback telemetry
- Add cross-workflow trace linking with parent context propagation
- Add OTEL exporter with configurable sampling and privacy controls
- Wire enterprise telemetry into workflow execution pipeline
- Add telemetry configuration in enterprise configs

api/core/workflow/nodes/tool/tool_node.py

@@ -61,6 +61,7 @@ class ToolNode(Node[ToolNodeData]):
             "provider_type": self.node_data.provider_type.value,
             "provider_id": self.node_data.provider_id,
             "plugin_unique_identifier": self.node_data.plugin_unique_identifier,
+            "credential_id": self.node_data.credential_id,
         }
 
         # get tool runtime
@@ -105,6 +106,20 @@ class ToolNode(Node[ToolNodeData]):
         # get conversation id
         conversation_id = self.graph_runtime_state.variable_pool.get(["sys", SystemVariableKey.CONVERSATION_ID])
 
+        from core.tools.workflow_as_tool.tool import WorkflowTool
+
+        if isinstance(tool_runtime, WorkflowTool):
+            workflow_run_id_var = self.graph_runtime_state.variable_pool.get(
+                ["sys", SystemVariableKey.WORKFLOW_EXECUTION_ID]
+            )
+            tool_runtime.parent_trace_context = {
+                "trace_id": str(workflow_run_id_var.text) if workflow_run_id_var else "",
+                "parent_node_execution_id": self.execution_id,
+                "parent_workflow_run_id": str(workflow_run_id_var.text) if workflow_run_id_var else "",
+                "parent_app_id": self.app_id,
+                "parent_conversation_id": conversation_id.text if conversation_id else None,
+            }
+
         try:
             message_stream = ToolEngine.generic_invoke(
                 tool=tool_runtime,