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Resource health helps you diagnose and get support when an Azure issue impacts your resources.
Azure DevOps Health API is a free Continuous Integration API that requires apiKey authentication, is only available over HTTP and does not support CORS, so it should be called from a server.
API reference documentation for the operations available in the Azure Resource health REST API, a RESTful web service for managing Azure Resource health resources in Azure.
Details from docs.microsoft.com.

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The Azure DevOps Health API is provided by Microsoft Learn (docs.microsoft.com). API reference documentation for the operations available in the Azure Resource health REST API, a RESTful web service for managing Azure Resource health resources in Azure.
Yes. The Azure DevOps Health API is listed in the Continuous Integration category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Azure DevOps Health API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The Azure DevOps Health API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
No. The Azure DevOps Health API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.