Servers not emitted in OpenAPI document

[martincostello]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I ran the spectral CLI against the OpenAPI schema generated for an app of mine using .NET 9 preview.4, and there was a single warning against it:

oas3-api-servers
OpenAPI "servers" must be present and non-empty array.

I see in #54598 that servers is mentioned, but I can't find anything explicit to track adding it in another issue or in any of the checkboxes in that issue.

servers: Derived from the host info registered in the IServer implementation.

It also isn't currently assigned in the code:

aspnetcore/src/OpenApi/src/Services/OpenApiDocumentService.cs

Lines 55 to 60 in 2b5d2b3

	var document = new OpenApiDocument
	{
	Info = GetOpenApiInfo(),
	Paths = await GetOpenApiPathsAsync(capturedTags, cancellationToken),
	Tags = [.. capturedTags]
	};

Expected Behavior

The servers property is present in the emitted OpenAPI schema document.

Steps To Reproduce

Generate an OpenAPI document for a Minimal API using the new OpenAPI NuGet package.

Exceptions (if any)

None.

.NET Version

9.0.100-preview.4.24267.66

Anything else?

No response