Lumigo’s Transaction Timeline is a tool that helps developers monitor and profile transactions in a microservices architecture, allowing them to identify bottlenecks and issues. It solves the problem of distributed tracing, which is complex due to the independent nature of microservices and the ephemeral nature of AWS Lambda containers. With Lumigo, developers can track down transactions across multiple services, including AWS services and third-party APIs, and visualize their interactions in a timeline view. This view provides detailed information on request times and execution times, making it easier to identify bottlenecks and improve performance. Additionally, the tool displays the total cost of transactions, providing a better overall cost breakdown. Lumigo's Transaction Timeline is available for free and can be set up in under 5 minutes with its onboarding wizard.