[BREAKING] Python: Observability cleanup (#905)

* Further observability cleanup and update telemetry samples

* Add VS Code Extension config

* Fix unit tests

* Fix unit tests

* Add more comments

* Remove live metric

python/samples/getting_started/observability/workflow_observability.py

@@ -0,0 +1,103 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+import asyncio
+
+from agent_framework import (
+    Executor,
+    WorkflowBuilder,
+    WorkflowContext,
+    WorkflowOutputEvent,
+    handler,
+)
+from agent_framework.observability import get_tracer, setup_observability
+from opentelemetry.trace import SpanKind
+from opentelemetry.trace.span import format_trace_id
+from typing_extensions import Never
+
+"""
+This sample shows the telemetry collected when running a Agent Framework workflow.
+
+Telemetry data that the workflow system emits includes:
+- Overall workflow build & execution spans
+- Individual executor processing spans
+- Message publishing between executors
+"""
+
+
+# Executors for sequential workflow
+class UpperCaseExecutor(Executor):
+    """An executor that converts text to uppercase."""
+
+    @handler
+    async def to_upper_case(self, text: str, ctx: WorkflowContext[str]) -> None:
+        """Execute the task by converting the input string to uppercase."""
+        print(f"UpperCaseExecutor: Processing '{text}'")
+        result = text.upper()
+        print(f"UpperCaseExecutor: Result '{result}'")
+
+        # Send the result to the next executor in the workflow.
+        await ctx.send_message(result)
+
+
+class ReverseTextExecutor(Executor):
+    """An executor that reverses text."""
+
+    @handler
+    async def reverse_text(self, text: str, ctx: WorkflowContext[Never, str]) -> None:
+        """Execute the task by reversing the input string."""
+        print(f"ReverseTextExecutor: Processing '{text}'")
+        result = text[::-1]
+        print(f"ReverseTextExecutor: Result '{result}'")
+
+        # Yield the output.
+        await ctx.yield_output(result)
+
+
+async def run_sequential_workflow() -> None:
+    """Run a simple sequential workflow demonstrating telemetry collection.
+
+    This workflow processes a string through two executors in sequence:
+    1. UpperCaseExecutor converts the input to uppercase
+    2. ReverseTextExecutor reverses the string and completes the workflow
+    """
+    # Step 1: Create the executors.
+    upper_case_executor = UpperCaseExecutor(id="upper_case_executor")
+    reverse_text_executor = ReverseTextExecutor(id="reverse_text_executor")
+
+    # Step 2: Build the workflow with the defined edges.
+    workflow = (
+        WorkflowBuilder()
+        .add_edge(upper_case_executor, reverse_text_executor)
+        .set_start_executor(upper_case_executor)
+        .build()
+    )
+
+    # Step 3: Run the workflow with an initial message.
+    input_text = "hello world"
+    print(f"Starting workflow with input: '{input_text}'")
+
+    output_event = None
+    async for event in workflow.run_stream(input_text):
+        if isinstance(event, WorkflowOutputEvent):
+            # The WorkflowOutputEvent contains the final result.
+            output_event = event
+
+    if output_event:
+        print(f"Workflow completed with result: '{output_event.data}'")
+
+
+async def main():
+    """Run the telemetry sample with a simple sequential workflow."""
+    # This will enable tracing and create the necessary tracing, logging and metrics providers
+    # based on environment variables. See the .env.example file for the available configuration options.
+    setup_observability()
+
+    with get_tracer().start_as_current_span("Sequential Workflow Scenario", kind=SpanKind.CLIENT) as current_span:
+        print(f"Trace ID: {format_trace_id(current_span.get_span_context().trace_id)}")
+
+        # Run the sequential workflow scenario
+        await run_sequential_workflow()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())