Common causes:

• System errors
• Infrastructure issues
• Malicious attacks
• Frequent updates
• Unexpected or access load
• DOS (Denial of Service) attack
• Inappropriate use of resources

Points to be considered:

• Circuit Breaker Pattern
• Health Check Endpoints and Monitoring
• Queue-based Load Leveling
• Throttling Pattern
• Retry and Timeout Pattern
• Bulkhead Pattern
• Schedular Agent Supervisor Pattern
• Compensating Transaction Pattern