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# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License.
"""
An example to show an application using Opentelemetry tracing api and sdk. Custom dependencies are
tracked via spans and telemetry is exported to application insights with the AzureMonitorTraceExporter.
"""
import os
from opentelemetry import trace
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from azure.monitor.opentelemetry.exporter import AzureMonitorTraceExporter
exporter = AzureMonitorTraceExporter.from_connection_string(
os.environ["APPLICATIONINSIGHTS_CONNECTION_STRING"]
)
trace.set_tracer_provider(TracerProvider())
tracer = trace.get_tracer(__name__)
span_processor = BatchSpanProcessor(exporter)
trace.get_tracer_provider().add_span_processor(span_processor)
with tracer.start_as_current_span("hello"):
print("Hello, World!")
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