Update microservices ebook - Implement API Gateways with Envoy

[erjain]

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- dotnet-architecture
- Previous docs: https://docs.microsoft.com/en-us/dotnet/architecture/microservices/multi-container-microservice-net-applications/implement-api-gateways-with-ocelot.

Describe the new article

- In eshopOnContainers, API Gateway is migrated from Ocelot to Envoy, so documentation needs to be updated.
- Location: https://docs.microsoft.com/en-us/dotnet/architecture/microservices/multi-container-microservice-net-applications/implement-api-gateways-with-ocelot.
- The reference microservice application [eShopOnContainers](https://github.com/dotnet-architecture/eShopOnContainers) has implemented Envoy as API Gateway, this has replaced the previous implementation Ocelot, This document will cover how to implement API Gateways with Envoy and how to use Envoy in a container-based environment.
- Create an outline for the new article. We'll help review the outline and approve it before anyone writes the article.:

    - Architect and design your API Gateways
    - Implementing your API Gateways with Envoy
            1. Main Components
            2. Set up Envoy
            3. Implement API Gateways with Envoy
            4. Describe envoy.yaml configuration
            5. How Envoy Helps in this application
    - Using Kubernetes Ingress plus Envoy API Gateways

[Edit to add doc details]

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Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 10ce8eaa-b3ff-9b69-fea1-131eed36b9ec
• Version Independent ID: 771d9f72-b506-79ef-5398-030c1705ee9a
• Content: Implementing API Gateways with Ocelot
• Content Source: docs/architecture/microservices/multi-container-microservice-net-applications/implement-api-gateways-with-ocelot.md
• Product: dotnet-architecture
• Technology: microservices
• GitHub Login: @nishanil
• Microsoft Alias: nanil

[erjain]

Hi @ardalis, adding you to this.

[gewarren]

eShopOnContainers now uses YARP. Updating the article is tracked by #27445.