What about "debug"? I think the important part about stderr is that it's "meta" info about how the program is running (or ran) rather than what the program is i

What about "debug"? I think the important part about stderr is that it's "meta" info about how the program is running (or ran) rather than what the program is intended to produce as output. This seems pretty similar to what often is referred to as the "debug" level of logging (which includes lower levels of logging like warnings and errors).