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Mission-Critical

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This repository provides a design methodology and approach to building highly-reliable applications on Microsoft Azure for mission-critical workloads.

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![Azure Mission-Critical](https://raw.githubusercontent.com/Azure/Mission-Critical/main/icon-light.png)
![Azure Mission-Critical](https://raw.githubusercontent.com/Azure/Mission-Critical/main/icon-dark.png)

## Welcome to Azure Mission-Critical

> [!IMPORTANT]
> This repository and the reference implementations are no longer actively maintained. While they may still contain valuable information, which can be used for reference in mission-critical workloads, we recommend visiting [Microsoft Learn](https://learn.microsoft.com/azure/architecture/reference-architectures/containers/aks-mission-critical/mission-critical-intro) for the most up-to-date resources and guidance.
>
> Thank you for your understanding and support.

Azure Mission-Critical is an open source project that provides a **prescriptive architectural approach to building highly-reliable cloud-native applications on Microsoft Azure for mission-critical workloads**. More specifically, this repository contains everything required to understand and implement an "always on" application on Microsoft Azure, and is comprised of the following:

1. **Architectural Guidelines**: cloud-native design methodology to guide readers through the architectural process of building a mature mission-critical application on Microsoft Azure, articulating key design considerations and requisite design decisions along with associated trade-offs.

2. **Fully Functional Reference Implementations**: end-to-end reference implementations intended to provide a solution orientated basis to showcase mission-critical application development on Microsoft Azure, leveraging Azure-native platform capabilities to maximize reliability and operational effectiveness.
    - Design and implementation guidance to help readers understand and use the Azure Mission-Critical design methodology in the context of a particular scenario.
    - Production-ready technical artifacts including Infrastructure-as-Code (IaC) resources and Continuous-Integration/Continuous-Deployment (CI/CD) pipelines (GitHub and Azure DevOps) to deploy an Azure Mission-Critical application with mature end-to-end operational wrappers.

## Azure Mission-Critical | Navigation

- [Introduction | What is Mission-Critical?](https://learn.microsoft.com/azure/architecture/framework/mission-critical/mission-critical-overview) - Detailed introduction into Mission-Critical, the problem it is intended to solve and the value it can provide.

- [Design Methodology | Mission-Critical Architectural Approach](https://learn.microsoft.com/azure/architecture/framework/mission-critical/mission-critical-design-methodology) - Prescriptive guidance aligned to 8 critical design areas guides users to design and build an mission-critical application, outlining a recommended decision process.

- [Reference Implementation | Online](https://github.com/Azure/Mission-Critical-Online) - Everything required to understand and build a copy of the reference implementation intended for online scenarios that are public-facing and do not require private network connectivity to a surrounding organizational technical estate.

- [Reference Implementation | Connected](https://github.com/Azure/Mission-Critical-Connected) - Everything required to understand and build a copy of the reference implementation intended for private scenarios that require integration with an organizational technical estate for either public-facing or internal-facing workloads.

## Helpful Information

The reference implementations are separated within dedicated repositories containing all relevant documentation and technical artifacts, along with a *getting started guide*:

[![Azure Mission-Critical Repo Structure](https://raw.githubusercontent.com/Azure/Mission-Critical/main/docs/media/repo-structure.png "Azure Mission-Critical Repo Structure")](./CONTRIBUTE.md)

- [Online Reference Implementation](https://github.com/Azure/Mission-Critical-Online)
- [Connected Reference Implementation](https://github.com/Azure/Mission-Critical-Connected)

> A list of [Frequently Asked Questions](./FAQ.md) is provided to capture common issues and challenges associated with using the Azure Mission-Critical project.

## Contributing

Azure Mission-Critical is a community driven open source project that welcomes contributions as well as suggestions. Most contributions require you to agree to a
Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit the [CLA portal](https://cla.opensource.microsoft.com).

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g. status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.

For more details, please read [how to contribute](./CONTRIBUTE.md).

## Microsoft Sponsorship

The Azure Mission-Critical project was created by the **Microsoft Customer Architecture Team (CAT)** who continue to actively sponsor the sustained evolution of the project through the creation of additional reference implementations for common industry scenarios.

Mission-Critical

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