Between v0.3.2 and v0.4 the fuzzing server stopped generating the aggregate.cov file. The code was in server.h.
The README still indicates that the fuzz server maintains an aggregate coverage file "coverage.cov".

Was this removed on purpose? As the README indicates, it's useful to have a single aggregate coverage file.

Of course I do realize I can just generate cov traces via the run command using the output directory as the --input argument and then concat them into a single trace file, but since it's still in the readme I wanted to inquire. I think Lighthouse has the "Code coverage batch" option too, which would do the same thing.