Update app.py with langfuse telemetry

app.py

@@ -1,18 +1,36 @@
 import yaml
 import os
+import base64
 from smolagents import GradioUI, CodeAgent, HfApiModel
 
 # Get current directory path
 CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
 
+# use langfuse as otel dashboard
+LANGFUSE_PUBLIC_KEY=os.getenv("LANGFUSE_PUBLIC_KEY")
+LANGFUSE_SECRET_KEY=os.getenv("LANGFUSE_SECRET_KEY")
+LANGFUSE_AUTH=base64.b64encode(f"{LANGFUSE_PUBLIC_KEY}:{LANGFUSE_SECRET_KEY}".encode()).decode()
+
+os.environ["OTEL_EXPORTER_OTLP_ENDPOINT"] = "https://cloud.langfuse.com/api/public/otel" # EU data region
+# os.environ["OTEL_EXPORTER_OTLP_ENDPOINT"] = "https://us.cloud.langfuse.com/api/public/otel" # US data region
+os.environ["OTEL_EXPORTER_OTLP_HEADERS"] = f"Authorization=Basic {LANGFUSE_AUTH}"
+
 from tools.web_search import DuckDuckGoSearchTool as WebSearch
 from tools.visit_webpage import VisitWebpageTool as VisitWebpage
 from tools.suggest_menu import SimpleTool as SuggestMenu
 from tools.catering_service_tool import SimpleTool as CateringServiceTool
 from tools.superhero_party_theme_generator import SuperheroPartyThemeTool as SuperheroPartyThemeGenerator
 from tools.final_answer import FinalAnswerTool as FinalAnswer
+from opentelemetry.sdk.trace import TracerProvider
+
+from openinference.instrumentation.smolagents import SmolagentsInstrumentor
+from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
+from opentelemetry.sdk.trace.export import SimpleSpanProcessor
 
+trace_provider = TracerProvider()
+trace_provider.add_span_processor(SimpleSpanProcessor(OTLPSpanExporter()))
 
+SmolagentsInstrumentor().instrument(tracer_provider=trace_provider)
 
 model = HfApiModel(
 model_id='Qwen/Qwen2.5-Coder-32B-Instruct',