• Table of contents
• Scalability issue
• Preventive action
• Corner cases
• Preventive action
• Supporting old browsers
• Preventive action
• Logic errors
• Preventive action
• Data-related issue
• Preventive action
• Race conditions / Slow network issues
• Preventive action
• Related to migration
• Preventive action
• Errors that didn't need to be logged
• Preventive action