Sample App: Online Bookstore

[Leo6Leo]

Problem

On the Knative website, we offer a variety of code snippets and examples designed to showcase the interactions between different Knative components.

However, there's a noticeable gap in our documentation: a comprehensive end-to-end (E2E) sample that illustrates how these components integrate in a real-world scenario.

This gap was highlighted in a GitHub issue by @omerbensaadon on knative/ux#33, emphasizing the need for a detailed E2E Getting Started guide for Eventing, covering sources, sinks, channels, brokers, triggers, and more.

Istio has this nice sample app that demonstrates how to use it.
It would be nice to have a non-trivial example to demonstrate similar concepts in Knative. Not sure if there is any but for example for Eventing I didn't find anything beyond hello-wrold like samples..
I would suggest an app that is aligned with common Knative use cases eg. an IoT app that processes sensor readings using a microservices based approach. It could use a different language per microservice.

To address this, we're launching the Knative Online Bookstore Sample App project, aiming to provide a clear, complete example of Knative's capabilities.

Persona:

Which persona is this feature for?
Administrators and developers

Exit Criteria

• Code Repository: The bookstore's complete, functional, and well-organized code will be hosted in the Knative documentation repository, specifically within the code-samples directory.
• Documentation: Comprehensive and user-friendly documentation will be provided, detailing step-by-step instructions on how to deploy and use the sample app, including explanations of each component's role and how they interact within the Knative ecosystem.
• Testing Guidelines: Include instructions for testing the application to ensure users can verify its functionality in their environment.
• Troubleshooting Guide: A section dedicated to common issues and their resolutions to aid users in solving potential problems.
• Feedback Mechanism: Encourage users to provide feedback or contribute improvements to both the sample app and the documentation.
• Version Compatibility: Clearly specify which versions of Knative (and any other dependencies) the sample app is compatible with, ensuring users can successfully deploy it.

Time Estimate (optional):
How many developer-days do you think this may take to resolve? 20+

Additional context (optional)

• The design doc can be found here

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