There are a few more that are fairly common to be logged somewhat separately: severity, host and component/service, but even if so, the structure is lacking in universality (i.e. lot of logging systems support this, but in their own ways). So, yeah, it's not much.
In my limited experience the amount of lines logged correlated with expected or actual activity of the system(s) is perhaps useful for monitoring. Looking into and analyzing the actual log events and their text is then the next step if there seems to be too much or too little information logged.
In my limited experience the amount of lines logged correlated with expected or actual activity of the system(s) is perhaps useful for monitoring. Looking into and analyzing the actual log events and their text is then the next step if there seems to be too much or too little information logged.