app.py

import os

from flask import Flask
import blinker as _

from ddtrace import tracer
from ddtrace.contrib.flask import TraceMiddleware

import logging
import sys

# Have flask use stdout as the logger
main_logger = logging.getLogger()
main_logger.setLevel(logging.DEBUG)
c = logging.StreamHandler(sys.stdout)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
c.setFormatter(formatter)
main_logger.addHandler(c)

tracer.configure(
    hostname=os.environ['DD_AGENT_SERVICE_HOST'],
    port=os.environ['DD_AGENT_SERVICE_PORT'],
)

app = Flask(__name__)

traced_app = TraceMiddleware(app, tracer, service="my-flask-app", distributed_tracing=False)

@app.route('/')
def hello_world():
    return 'Flask Dockerized'

if __name__ == '__main__':
    app.run(debug=True,host='0.0.0.0')