Observability has many names, such as monitoring, tracing, logging, telemetry, and instrumenting. All of these are required to create observability. It includes measuring your infrastructure, security, and application to understand how they are doing and then acting on the findings, with either predictive or reactive solutions. Why do you need to do observability? What do you measure? To get an answer to these questions, you need to ask yourself the following:
Is my user happy?
Are my applications behaving ...
