Wer mir Gutes gönnt!

14:14 Aug 25, 2023 

...trying to sound too curt (am occupied otherwise):

You're all familiar with the expression "jemandem etwas Gutes gönnen" (the part in bold is what was missing from Phil's explanation).

The sentence isn't really incomplete; you can find it online in different versions:
"Dein Absehn mußt du wohl verhehlen;
Sprich jeden, der mir Gutes gönnt,
Und laß dir stets von mir erzählen"
https://www.gedichte-lyrik-online.de/an-leonore.html

"Ja, wie wollen mir nicht alle Dinge zu gute kommen und dienen, wenn der mir Gutes gönnt, dem sie alle gehorsam und untertan sind?"
https://www.glaubensstimme.de/doku.php?id=autoren:l:luther:z...

The issue may be (which is why I'll have to add a few notes elsewhere still) that all of this is written in a very conversational tone so the context in which the phrase is used is all the more important.

Based on the first sentence ("...N.N.'s und N.N.'s glücklicher Ankunft..."), I'd rephrase it as "Da freue ich mich wirklich sehr!" or "Da kann ich mich aber glücklich schätzen!"

Best wishes and enjoy your weekend

14:02 Aug 25, 2023 

(!) indicates enthusiasm .

13:15 Aug 25, 2023 

and don't forget that "mir" can mean "wir" in Yiddish, Bavarian and Rhein-Mosel dialect
Perhaps it means "we've been treated well" but as Phil says the sentence is abrupt.

12:27 Aug 25, 2023 

May be 'to do good'

11:59 Aug 25, 2023 

I think the idea of Gutes gönnen is to treat or indulge, and it sounds like a deliberately incomplete sentence, implying that the writer doesn't have to spell out the rest. But I'm not sure what it means.