.env

export OTEL_PYTHON_LOG_CORRELATION="true"
export OTEL_RESOURCE_ATTRIBUTES="service.name=otlptest, environment=test"
export OTEL_TRACES_EXPORTER="otlphttp"
export OTEL_EXPORTER_OTLP_ENDPOINT="https://otlphttp"
export OTEL_PYTHON_DJANGO_INSTRUMENT="True"

app.py

import os
import socket 

from flask import Flask
from opentelemetry.instrumentation.flask import FlaskInstrumentor
from opentelemetry import trace
from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
from opentelemetry.sdk.resources import Resource
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from opentelemetry.instrumentation.logging import LoggingInstrumentor


# Resource can be required for some backends, e.g. Jaeger
# If resource wouldn't be set - traces wouldn't appears in Jaeger
resource = Resource(attributes={
    "service.name": "otlptest"
})

trace.set_tracer_provider(TracerProvider(resource=resource))
tracer = trace.get_tracer(__name__)

otlp_exporter = OTLPSpanExporter(endpoint="https://otlphttp/v1/traces")

span_processor = BatchSpanProcessor(otlp_exporter)

trace.get_tracer_provider().add_span_processor(span_processor)

from logging.config import dictConfig

LOGGING = {
    'version': 1,
    'disable_existing_loggers': True,
    'formatters': {
        'json': {'()': 'pythonjsonlogger.jsonlogger.JsonFormatter'},
        'standard': {
            'format': '%(asctime)s %(levelname)s [%(name)s] [%(filename)s:%(lineno)d] [traceID=%(otelTraceID)s spanID=%(otelSpanID)s resource.service.name=%(otelServiceName)s] - %(message)s',
            'datefmt': '%d-%m-%Y %H:%M:%S'
        },
    },
    'handlers': {
        'console': {
            'level': 'INFO',
            'class': 'logging.StreamHandler',
            'formatter': 'standard',
        },
        'loki': {
            'level': 'DEBUG',
            'class': 'logging_loki.LokiHandler',
            'url': f"{os.getenv('MVENTORY_LOKI_HOST')}/loki/api/v1/push",
            'tags': {"app": "otlptest", "env": "dev"},
            'version': "1",
            'formatter': 'json',
        },
    },
    'loggers': {
        'root': {
            'handlers': ['loki', 'console'],
            'level': 'DEBUG',
            'propagate': True,
        },
    }
}

dictConfig(LOGGING)


LoggingInstrumentor().instrument(set_logging_format=True)

app = Flask(__name__)

FlaskInstrumentor().instrument_app(app)

@app.route("/")
def hello():
    return "Hello!"

if __name__ == "__main__":
    app.run(debug=True)

requirements.txt

backoff==1.10.0
certifi==2021.10.8
charset-normalizer==2.0.9
click==8.0.3
Deprecated==1.2.13
Flask==2.0.2
googleapis-common-protos==1.53.0
grpcio==1.42.0
idna==3.3
itsdangerous==2.0.1
Jinja2==3.0.3
MarkupSafe==2.0.1
opentelemetry-api==1.7.1
opentelemetry-exporter-otlp==1.7.1
opentelemetry-exporter-otlp-proto-grpc==1.7.1
opentelemetry-exporter-otlp-proto-http==1.7.1
opentelemetry-instrumentation==0.26b1
opentelemetry-instrumentation-flask==0.26b1
opentelemetry-instrumentation-logging==0.26b1
opentelemetry-instrumentation-wsgi==0.26b1
opentelemetry-proto==1.7.1
opentelemetry-sdk==1.7.1
opentelemetry-semantic-conventions==0.26b1
opentelemetry-util-http==0.26b1
protobuf==3.19.1
python-json-logger==2.0.2
python-logging-loki==0.3.1
requests==2.26.0
rfc3339==6.2
six==1.16.0
urllib3==1.26.7
uWSGI==2.0.20
Werkzeug==2.0.2
wrapt==1.13.3