Logging
Logging records system, application, and access events in structured files or streams, enabling error diagnosis, performance monitoring, and post-incident analysis. It provides a tamper-proof audit trail that client-side analytics cannot replicate.
In practice
Web server access logs (Nginx, Apache) are the ground truth for SEO analysis: they show exactly which URLs Googlebot visited, at what frequency, and with which HTTP status codes — data that cannot be falsified unlike JavaScript reports. A tool like GoAccess or an ELK pipeline (Elasticsearch-Logstash-Kibana) transforms raw logs into actionable dashboards in under an hour of configuration.