Yeah, I also figured out the addition of Base.gc_num() but rather had the impression that it is overestimating the memory footprint:
GC total: 1160.298 MiB
GC live: 65.111 MiB
JIT: 0.872 MiB
Max. RSS: 343.137 MiB
Although it seems to match the combined memory I see in task manager of two Julia processes I have running (one being the LSP in VSCode, I assume).