I remember when I first got a glucose meter in about 1980, it came with a nice bound log book that I used for about a week.
The only other venture into logging has come with the diabetes app I’m using because it has CGM track, carbs, insulin and notes all in one place with quick easy entry. I look back on it once in a while if I’m having a hard time staying ine track.
I’m just not a very good diabetic I guess.