In this chapter, we discuss ensuring maximum observability of microservices. OpenTelemetry has become the standard health monitoring tool, so we really lean in and look at the benefits of OpenTelemetry..NET Aspire is a great way to easily set up OpenTelemetry and use it during local development and debugging. We can use custom logs, traces, and metrics to add additional visibility to microservices, allowing us to easily find the source of a future problem. In production, we can use Azure Application Insights to capture production logs, traces, and metrics through OpenTelemetry.