Cleanup

[julianocosta89]

Background

Before this PR all services had OpenCensus and Cloud Operations (Stackdriver) on it.
OpenCensus and OpenTracing have merged into OpenTelemetry, which serves as the next major version to both frameworks.
Cloud Operations (Stackdriver) is a service from Google Cloud and will only work on Google Cloud.
This PR updates the stack and removes vendor lock-in of the project.

Change Summary

• All services had their OpenCensus and Cloud Operations (Stackdriver) dependencies removed.
• All services were instrumented with OpenTelemetry.
• An OpenTelemetry Collector was added to which all traces are being sent.
• A Jaeger container was added, so we are able to visualize the traces.
• All services had their technologies version updated to the latest:
  • adservice: from openjdk:8 to openjdk:17
  • checkoutservice: from golang:1.17.5 to golang:1.17.6
  • emailservice: from python:3.7 to python:3.10
  • frontend: from golang:1.17.5 to golang:1.17.6
  • loadgenerator: from python:3.8 to python:3.10
  • otelcollector: started on 0.42.0
  • productcatalogservice: from golang:1.17.5 to golang:1.17.6
  • recommendationservice: from python:3.7 to python:3.10
  • shippingservice: from golang:1.17.5 to golang:1.17.6

Additional Notes

The Architecture diagram was also updated with some color coding to show the services and its technologies.