opentelemetry kubernetes demo

app.py

import datetime
from flask import Flask, jsonify

then = datetime.datetime.now()

app = Flask(__name__)

@app.route('/', methods=['GET'])
def root():
  return jsonify({"message": "Hello world"})

@app.route('/healthz', methods=['GET'])
def healthz():
  now = datetime.datetime.now()
  delta = now - then
  return jsonify({"message": f"Up for {delta} seconds"})

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

collector.yaml

apiVersion: opentelemetry.io/v1alpha1
kind: OpenTelemetryCollector
metadata:
  name: sidecar-collector
spec:
  mode: sidecar
  config: |
    receivers:
      otlp:
        protocols:
          grpc:
          http:
    processors:
    exporters:
      logging:
    service:
      pipelines:
        traces:
          receivers: [otlp]
          processors: []
          exporters: [otlp]

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: flask-example
  name: flask-example
spec:
  replicas: 1
  selector:
    matchLabels:
      app: flask-example
  strategy: {}
  template:
    metadata:
      annotations:
        sidecar.opentelemtry.io/inject: "true"
        instrumentation.opentelemetry.io/inject-python: "true"
      labels:
        app: flask-example
    spec:
      containers:
      - image: ashoka007/flask-example:0.1
        name: flask-example
        ports:
        - containerPort: 5000
        resources: {}
status: {}

Dockerfile

FROM python:3.10

WORKDIR /src
COPY app.py .

EXPOSE 5000

RUN pip install flask
CMD ["python", "app.py"]

# Build
# docker build -t ashoka007/flask-example:0.1

instrumentation.yaml

apiVersion: opentelemetry.io/v1alpha1
kind: Instrumentation
metadata:
  name: python-instrumentation
spec:
  env:
    - name: OTEL_EXPORTER_OTLP_TIMEOUT
      value: "20"
    - name: OTEL_TRACES_SAMPLER
      value: parentbased_traceidratio
    - name: OTEL_TRACES_SAMPLER_ARG
      value: "0.85"
  exporter:
    endpoint: http://localhost:4317
  propagators:
    - tracecontext
    - baggage
  sampler:
    type: parentbased_traceidratio
    argument: "0.25"
  python:
    env:
      - name: OTEL_LOG_LEVEL
        value: "debug"
      - name: OTEL_TRACES_EXPORTER
        value: otlp_proto_http
      - name: OTEL_EXPORTER_OTLP_ENDPOINT
        value: http://localhost:4317

requirements.txt

flask

service.yaml

apiVersion: v1
kind: Service
metadata:
  labels:
    app: flask-example
  name: flask-example
  namespace: default
spec:
  ports:
  - port: 5000
  selector:
    app: flask-example