The Developer's Guide to Audit Logs / SIEM provides an in-depth look at audit logs, their importance, event formats, SIEM tools, retention best practices, and more. It explains why audit logs are crucial for app security and how they provide a granular paper trail of user actions within applications. The guide also covers the different types of events to emit, event payloads and formatting, retention windows, building frontends, and integrating with SIEM tools like Splunk and Microsoft's Sentinel. A walkthrough example using Slack is provided to illustrate how successful companies have built great enterprise-ready features through audit logs.