AWS re:Invent is an annual conference where AWS users meet and learn about the latest developments in cloud computing. Amazon's Director of Technical Operations, Mike Fiedler, delivered a presentation titled "Instrumenting Application Stacks in a Dynamically Scaling Environment" at the event. The presentation focused on the importance of gaining visibility into application stack performance and how instrumenting components can be challenging in dynamically scaling environments. Mike demonstrated a technical approach to remove manual steps by auto-instrumenting hosts for graphing and alerting, showcasing metrics graphs to illustrate different system behaviors. The presentation highlights the need for monitoring tools like Datadog to gain insights into application performance. AWS provided a great experience for attendees at the conference.