Add LangGraph integration with AgentOps (#1107)

* Add LangGraph integration with AgentOps for enhanced observability

* feat: Add LangGraph examples demonstrating improved AgentOps instrumentation

* fix notebook

---------

Co-authored-by: Fenil Faldu <[email protected]>

Author: Dwij1704

agentops/instrumentation/__init__.py

@@ -125,6 +125,11 @@ class InstrumentorConfig(TypedDict):
         "class_name": "SmolagentsInstrumentor",
         "min_version": "1.0.0",
     },
+    "langgraph": {
+        "module_name": "agentops.instrumentation.agentic.langgraph",
+        "class_name": "LanggraphInstrumentor",
+        "min_version": "0.2.0",
+    },
 }
 
 # Combine all target packages for monitoring

agentops/instrumentation/agentic/langgraph/__init__.py

@@ -0,0 +1,3 @@
+from agentops.instrumentation.agentic.langgraph.instrumentation import LanggraphInstrumentor
+
+__all__ = ["LanggraphInstrumentor"]

agentops/instrumentation/agentic/langgraph/attributes.py

@@ -0,0 +1,54 @@
+from typing import Dict, Any
+import json
+
+
+def ensure_no_none_values(attributes: Dict[str, Any]) -> Dict[str, Any]:
+    return {k: v for k, v in attributes.items() if v is not None}
+
+
+def set_graph_attributes(span: Any, graph_nodes: list = None, graph_edges: list = None) -> None:
+    if graph_nodes:
+        span.set_attribute("langgraph.graph.nodes", json.dumps(graph_nodes))
+        span.set_attribute("langgraph.graph.node_count", len(graph_nodes))
+
+        for i, node in enumerate(graph_nodes):
+            span.set_attribute(f"langgraph.node.{i}.name", node)
+            span.set_attribute(f"langgraph.node.{i}.type", "unknown")
+
+    if graph_edges:
+        span.set_attribute("langgraph.graph.edges", json.dumps(graph_edges))
+        span.set_attribute("langgraph.graph.edge_count", len(graph_edges))
+
+        for i, edge in enumerate(graph_edges):
+            parts = edge.split("->")
+            if len(parts) == 2:
+                span.set_attribute(f"langgraph.edge.{i}.source", parts[0])
+                span.set_attribute(f"langgraph.edge.{i}.target", parts[1])
+
+
+def extract_messages_from_input(input_data: Any) -> list:
+    if isinstance(input_data, dict) and "messages" in input_data:
+        return input_data["messages"]
+    return []
+
+
+def extract_messages_from_output(output_data: Any) -> list:
+    if isinstance(output_data, dict) and "messages" in output_data:
+        return output_data["messages"]
+    return []
+
+
+def get_message_content(message: Any) -> str:
+    if hasattr(message, "content"):
+        return str(message.content)
+    return ""
+
+
+def get_message_role(message: Any) -> str:
+    if hasattr(message, "role"):
+        return message.role
+    elif hasattr(message, "type"):
+        return message.type
+    elif hasattr(message, "__class__"):
+        return message.__class__.__name__.replace("Message", "").lower()
+    return "unknown"