Intelligent Log Anomaly Detection System: Interpretable Root Cause Analysis Combining Machine Learning, RAG, and LLM

This article introduces the open-source intelligent log analysis system Log-Anomaly-Detection, which integrates machine learning, Retrieval-Augmented Generation (RAG), and Large Language Model (LLM) technologies to achieve automatic anomaly detection and interpretable root cause analysis for system logs, addressing the pain points of low efficiency in traditional log monitoring and high Mean Time to Repair (MTTR).

Modern distributed system logs are growing explosively; manual monitoring is inefficient and prone to missing critical anomalies. Traditional rule/threshold detection struggles to adapt to complex system requirements. After anomaly detection, operation and maintenance (O&M) engineers spend a lot of time analyzing root causes without automated support, leading to high MTTR.

The system adopts a modular pipeline design: Raw Logs → Machine Learning Anomaly Detection → RAG Similar Case Retrieval → LLM Root Cause Explanation Generation. The machine learning layer is trained using structured HDFS datasets to identify anomaly patterns; the RAG layer searches historical cases via vector similarity; the LLM layer integrates information to generate readable reports containing anomaly descriptions, root cause analysis, and repair suggestions.

The system is applicable to scenarios such as cloud infrastructure O&M (monitoring health status), security threat detection (identifying abnormal access), application performance management (locating code defects), and compliance audit support (automatically generating reports), which can significantly improve O&M efficiency and problem-solving speed.

Log-Anomaly-Detection enhances the capabilities of human experts through AI, achieving a closed loop of 'detection + explanation + suggestion'; its modular architecture supports component replacement and expansion, and cloud-native deployment facilitates integration with existing toolchains; interpretability is prioritized to help O&M teams quickly understand the essence of problems.

This project reflects the trend of the AIOps field evolving from single detection to closed-loop solutions; it is recommended that O&M teams experiment with such technologies as early as possible and build solutions using open-source components; future improvements in LLM and RAG technologies will further enhance the system's practicality and lay the foundation for intelligent transformation.