What is latency? And how exactly do you debug it?

Jaana writes on the Observability+ blog:

In the recent decade, our systems got complex. Our average production environments consist of many different services (many microservices, storage systems and more) with different deployment and production-maintenance cycles.

Measuring latency and being able to react to latency issues are getting equally complex as our systems got more complex. This article will help you how to navigate yourself at a latency problem and what you need to put in place to effectively do so.