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I assume "Guru Mediation" is supposed to be "Guru Meditation", a reference to the way AmigaOS used to describe system failures.

Mediation vs Meditation I think.

I think Varnish uses mediation intentionally though, it was this way 7 years ago when I last used Varnish.

According to the Wikipedia page, it is intentional:

Or did one of you already edit the Wikipedia page to reflect this discussion on hn?

It appears the mention of "Mediation" was made very recently, likely in response to what's currently going on.

And it seems to be incorrect, since this "spelling variation" is only used by Fastly and not part of Varnish?...

The typo is "Mediation" instead of "Meditation", I think.