From Newsgroup: rec.puzzles


[Warm tips] was sighted in LanguageLOG in 2016.

Apparently a literal translation of Wēnxīn tíshì 溫馨提示 ("gentle reminder")


I'd suppose that the NUance is like [Friendly Advice]


https://languagelog.ldc.upenn.edu/nll/?p=12616

[Warm Notice] sighting in 2014
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