Log management is the process of generating, transmitting, storing, accessing, and disposing of log data from computer systems. Each log entry contains information about a specific event occurring within an organization's computing assets, including physical and virtual platforms, networks, services, and cloud environments. The process breaks down into four main phases: collection (capturing data from log files, stdout, or network sockets), aggregation (centralizing in a single location), storage and retention (handling volume according to corporate or regulatory policies), and analysis (detecting security incidents and performance issues).

Proper log retention is a critical compliance requirement. Standards such as PCI DSS mandate retaining access logs for at least 12 months, with 3 months immediately available for analysis. The NIST SP 800-92 guide provides the reference framework for implementing log management infrastructures, covering generation, transmission, storage, analysis, and secure disposal. Without a well-calculated retention policy, organizations face risks of failing audits, being unable to investigate security incidents, or incurring excessive storage costs.

• Regulatory compliance and audits: Companies processing credit card data (PCI DSS), medical information (HIPAA), or financial records (SOX) must demonstrate they retain logs for specific periods and can produce audit trails on demand.
• Incident forensic investigation: After a security breach, authentication logs, file access records, and network traffic logs are the only source to reconstruct the attack timeline and identify compromised systems.
• Storage cost optimization: DevOps and SRE teams need to calculate daily log volume to budget for S3, Glacier, or SIEM solution storage, deciding which logs to keep hot and which to archive or rotate.