GitHub user edespino added a comment to the discussion: Introducing the 
[perfmon] Extension for Cloudberry Database Monitoring​

## 📌 Note: Replacing libsigar in gpsmon

Hi @fanfuxiaoran,

Following up on the effort to replace libsigar within gpsmon: while SIGAR is 
Apache-licensed and technically ASF-compatible, it's effectively unmaintained 
and fragile on modern Linux systems. We’ve looked into possible alternatives — 
specifically C-based, Linux-only libraries with a comparable feature set and 
compatible licensing.

### 🔍 Summary of Findings

Despite a broad survey, there does not appear to be a single, actively 
maintained, C-based library that:
* Matches libsigar’s full system and per-process metrics coverage,
* Works cleanly across modern Linux distros,
* And is ASF-compatible (e.g., not LGPL/GPL).

✅ Recommendation

Given these constraints, the cleanest and most sustainable path forward is to 
incrementally replace SIGAR usage with direct /proc, /sys, and statvfs() 
parsing, organized as:
* Modular internal helpers: cpu.c, mem.c, proc.c, net.c, fs.c
* Simple, reusable get_*_stats() functions
* Preserved structure and logic in gpsmon with minimal disruption

This approach ensures:
* No licensing risk
* Tight control over compatibility and behavior
* A path toward long-term maintainability
    
This would allow you to phase out SIGAR while maintaining equivalent 
functionality and aligning with ASF licensing policy.

This is simply a proposed direction to consider as you evaluate how best to 
support the SIGAR functionality in some form going forward.

-=e

GitHub link: 
https://github.com/apache/cloudberry/discussions/1087#discussioncomment-13072461

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