1. INTRODUCTION

2. LOG STATEMENTS AND LOG FILES

3. STUDY DESIGN

4. RQ1: HOW THE PRIOR LOGGING RESEARCH CAN BE CATEGORIZED TO DIFFERENT TOPICS?

5. RQ2: WHAT ARE THE PUBLICATION TRENDS BASED ON VENUES, TOPICS, AND YEARS?

6. RQ3: HOW THE RESEARCH IN EACH TOPIC CAN BE SYSTEMATICALLY COMPARED WITH THEIR APPROACHES, PROS AND CONS?

7. RQ4: CHALLENGES AND OPPORTUNITIES FOR FUTURE WORK

8. CONCLUSIONS