The logs should be really terse and just state what happened when, not get into the details of the specific topic. They should read like a story or history or captain’s log. Now if the log entry is about an event describing that event — even if that description is not short — is fine.
But there is really no need to add a log entry after adding each and every random zet entry. Those are already chronological. In that case a general log entry describing the feeling and need to write about a particular topic is a better log entry.