Python Genesis App Metrics Fix (#431)

*Description of changes:*
Main build failed a few times due to metrics not being emitted from the
Genesis sample app. Adding a custom metric emission to prevent flaky
issue.


By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: liustve

.github/workflows/python-sample-app-s3-deploy.yml

@@ -67,3 +67,11 @@ jobs:
         working-directory: lambda-layer/sample-apps
         run: aws s3api put-object --bucket ${{ secrets.APP_SIGNALS_E2E_EC2_JAR }}-prod-${{ matrix.aws-region }} --body ./build/function.zip --key pyfunction.zip
 
+      - name: Build Gen AI Sample App Zip
+        working-directory: sample-apps/python/genai_service
+        run: zip -r python-gen-ai-sample-app.zip .
+
+      - name: Upload Gen AI Sample App to S3
+        working-directory: sample-apps/python/genai_service
+        run: aws s3api put-object --bucket ${{ secrets.APP_SIGNALS_E2E_EC2_JAR }}-prod-${{ matrix.aws-region }} --body ./python-gen-ai-sample-app.zip --key python-gen-ai-sample-app.zip
+

sample-apps/python/genai_service/server.py

@@ -6,11 +6,12 @@
 from langchain_aws import ChatBedrock
 from langchain.prompts import ChatPromptTemplate
 from langchain.chains import LLMChain
-from opentelemetry import trace
+from opentelemetry import trace, metrics
 from opentelemetry.sdk.trace import TracerProvider
 from opentelemetry.sdk.trace.export import BatchSpanProcessor, ConsoleSpanExporter
 from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
 from openinference.instrumentation.langchain import LangChainInstrumentor
+import random
 
 # Load environment variables
 load_dotenv()
@@ -92,7 +93,15 @@ async def chat(request: ChatRequest):
     """
     Chat endpoint that processes a single user message through AWS Bedrock
     """
+
     try:
+        # Emit OTel Metrics
+        meter = metrics.get_meter("genesis-meter", "1.0.0")
+        request_duration = meter.create_histogram(
+            name="Genesis_TestMetrics", description="Genesis request duration", unit="s"
+        )
+        request_duration.record(0.1 + (0.5 * random.random()), {"method": "GET", "status": "200"})
+
         # Process the input through the chain
         result = await chain.ainvoke({"input": request.message})
         return ChatResponse(response=result["text"])