Python span context management

server.py

from opentelemetry import trace

# create a tracer and name it after your package
tracer = trace.get_tracer(__name__)

@app.route("/hello")
def hello():
   # add latency to the parent span
   sleep(20 / 1000)

   # Manage the span lifecycle correctly by
   # creating a new context for the spab a span
   with tracer.start_as_current_span("server_span") as span:
     
     # get_current_span return the correct span
     trace.propagation.get_current_span().add_attributes({"label": "value"})

     # add latency to the child span
     sleep(30 / 1000)
     return "hello"