For a few revisions now, I have seen the following as the very first line of log files. It is not coming from my document. Is anybody else seeing it?

fonts           > beware: no fonts are loaded yet, using 'lm mono' in box

Here is an example document that generates it:

\setupbodyfont[libertinus,10pt]
\starttext
Hello world!
\stoptext

It seems harmless, but it does result in loading an un-needed font.

mkiv lua stats  > loaded fonts: 4 files: lmmono10-regular.otf, libertinusmath-bold.otf, libertinusmath-regular.otf, libertinusserif-regular.otf

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Rik