Elastic Stack Observability

Elastic Stack (formerly ELK: Elasticsearch, Logstash, Kibana) is a platform for collecting, storing, and analyzing logs, metrics, and traces from applications and infrastructure. Elasticsearch is a search and analytics engine. Logstash parses and transforms logs. Kibana is the visualization and alerting UI. Workflow: (1) Applications log events. (2) Beats agents collect and forward. (3) Logstash parses (extract timestamp, severity, error message). (4) Elasticsearch indexes. (5) Kibana visualizes and alerts.