I don't see releases in this repo!

The NuGet here: https://www.nuget.org/packages/Microsoft.Azure.Functions.Extensions/
references this repo as the source for 'Microsoft.Azure.Functions.Extensions.dll' which I see loaded in my function app.

I would expect to see specific release with the exact source used for this NuGet - or at least a branch for this release. I can't this here.

How do I get exact source for assembly loaded in my app?

Start with the Microsoft.Azure.Functions.Extensions NuGet package and this repository to determine how the package's source is identified. Check whether a release, tag, or branch corresponds to the published assembly. Done means the exact source used for the NuGet package is available or clearly documented.

Written by the indexing model from the issue text.