The blog post, part of a series on integrating the Elastic Stack with ArcSight SIEM, explores how to monitor security data in Elasticsearch using X-Pack's alerting features. It offers a step-by-step guide to setting up alerts for successful SSH logins from external IPs using Common Event Format (CEF) data, processed with Logstash and visualized in Kibana. The approach involves creating "watches" to detect anomalies by setting an alert execution schedule, defining input data, and transforming the data into a readable structure. The post provides a detailed example of a watch configuration that triggers alerts when specific conditions are met, such as a successful login from an external IP, and discusses the use of Elasticsearch’s native scripting language for processing. As part of a broader series, this post builds on earlier discussions and sets the stage for further exploration into scaling architecture and detecting complex patterns with machine learning in subsequent entries.