Old repo issue number mapped to new repo issue number (dotnet#31981)

* Old repo issue number mapped to new repo issue number * add explanation
javidhasanzade · Feb 8, 2020 · c649e3b · c649e3b
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diff --git a/docs/issue-mappings/README.md b/docs/issue-mappings/README.md
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+Many of the issues in this repo were originally created in the dotnet/coreclr, dotnet/corefx, and dotnet/core-setup repos, then migrated here to the dotnet/runtime repo.
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+In this process their ID numbers inevitably changed. If you have the old ID number, you can find the new ID number by simply navigating to the old URL: your browser will be redirected to the new URL.
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+For example, https://github.com/dotnet/coreclr/issues/25 redirects to https://github.com/dotnet/runtime/issues/3858.
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+In some circumstances you may have the new URL and want the old one. For example, if you are looking at a migrated issue and wish to search your email or chat logs for a discussion that referred to the old URL. In that case, you can use these mapping files to look up the old ID and find the old URL.
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