Log data is crucial to Security Information and Event Management (SIEM) systems, serving as the foundational material for understanding IT events, but requires extensive processing and management steps to be truly useful. The ELK Stack, a popular open-source platform for log analysis, plays a significant role in log management within many open-source SIEM solutions. However, while it excels at data collection, parsing, storage, and analysis, the ELK Stack on its own lacks essential SIEM features like built-in alerting, correlation rules, and incident management capabilities. To transform the ELK Stack into a comprehensive SIEM solution, organizations often need to integrate additional components, which can be technically challenging and resource-intensive. Logz.io addresses these gaps by offering Cloud SIEM, a fully-featured, ELK-based solution with prebuilt rules, dashboards, and integrations, simplifying the process for users who prefer not to manage these complexities themselves. For those opting to build their own SIEM, augmenting the ELK Stack with other tools is necessary, though it demands significant engineering effort and expertise.