As a new, separate issue to #5261 the request is similar to that issue where an indicator is added to show whether a field has been rewritten. This will aid in helping a site builder understand why a field in the output, isn't acting the way they expect. Having an indicator that a field is rewritten, gives a visual representation of what the field is actually outputting.
Things to do: - Add a class "views-field-rewritten" to the field link if it is rewritten, similar to how an excluded field has the class "views-field-excluded" to allow custom styling on the link based on the fact that the link is rewritten. - Add a span to house any icons that may be used as a visual indicator
Possible ideas for icons:

[file-contract] [cog] [wrench] [exclamation] [pen-fancy] [paint-brush]
IMO the file-contract makes the most sense out of these, but I'm not sold on any one of them.
If I missed anything, feel free to add it.
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@yorkshirepudding thank you for the additional info on improving discoverability and a handy way to keep a list of projects for reuse.
Why not add a Github star?
It is a good point @izmeez and when I was researching repo discoverability I found that GitHub search does prioritise matches with more stars. This is what I was researching for:...
Why not add a Github star?
Do you have a separate development environment and transfer database and config between sites?
Wierd happenings regarding updates...