This guide explains how to track Linux user activity and system events using native commands such as who, w, last, ps, ss, journalctl, and the auditd framework, providing step‑by‑step examples and advanced auditing techniques for security and compliance.
This article explains why traditional DAU metrics are insufficient, introduces survival analysis fundamentals and key functions, demonstrates how Kaplan‑Meier curves can characterize user activity, and presents KwaiSurvival—a deep‑learning‑based survival modeling suite with DeepSurv, DeepHit and N‑MTLR models—for practical user‑engagement and churn‑prevention use cases.
This article demonstrates how to use SQL, including dense_rank and date arithmetic, to detect users who have recorded a specific event for at least seven consecutive days within a month, providing step‑by‑step queries and a complete combined statement.
