Optimize omil repository: upgrade Go version, add configurable timeout, improve error handling

[devin-ai-integration]

Optimize omil repository: upgrade Go version, add configurable timeout, improve error handling

Summary

This PR addresses several identified issues in the omil codebase:

• Security improvement: Upgrades Go version from 1.15.3 to 1.18 to address potential security vulnerabilities
• Configurable timeout: Replaces hardcoded 60-minute monitor timeout with configurable TimeoutMinutes parameter
• Enhanced error handling: Implements retry logic with exponential backoff for monitor failures, replacing simple restart approach
• Configuration validation: Adds comprehensive validation for required configuration fields with clear error messages
• Documentation: Updates example configuration with helpful comments and new timeout option

Review & Testing Checklist for Human

Risk Level: 🟡 Medium - Behavioral changes and version upgrade require careful testing

• Verify Go 1.18 compatibility - Test that existing deployments work with the new Go version without breaking changes
• Test configuration validation - Ensure existing valid configuration files are not rejected by the new validation logic
• Validate retry behavior - Test monitor failure scenarios to confirm exponential backoff and retry limits work correctly
• End-to-end testing - Run the application in a real environment with actual ICMP monitoring targets
• Timeout configuration - Verify that custom TimeoutMinutes values work correctly and default to 60 minutes when not specified

Recommended Test Plan:

1. Deploy with existing configuration files to ensure no breaking changes
2. Test monitor failure scenarios (network unreachable, permission issues) to verify retry logic
3. Test various timeout configurations (1 minute, 120 minutes, invalid values)
4. Monitor logs during failure scenarios to ensure proper error reporting

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    A["main.go"]:::major-edit --> B["config/config.go"]:::major-edit
    A --> C["loop/loop.go"]:::major-edit
    B --> D["conf/example.config.yml"]:::minor-edit
    E[".github/workflows/main.yml"]:::minor-edit
    F["go.mod"]:::minor-edit
    
    A --> G["icmp/pinger.go"]:::context
    C --> G
    
    subgraph Legend
        L1[Major Edit]:::major-edit
        L2[Minor Edit]:::minor-edit
        L3[Context/No Edit]:::context
    end
    
    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#ADD8E6
    classDef context fill:#FFFFFF

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Notes

• The signal handling bug (unbuffered channel) has been fixed as part of the error handling improvements
• Configuration validation provides detailed error messages to help users fix configuration issues
• The retry logic includes maximum retry limits and exponential backoff to prevent infinite retry loops
• All changes maintain backward compatibility except for the Go version requirement

Session Info:

• Link to Devin run: https://app.devin.ai/sessions/9d8a60b9150342138d8716e5eea8bc1d
• Requested by: 马莉珍 (@Malizhen)

[devin-ai-integration]

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[devin-ai-integration]

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