monitoring the internal state of a system by looking at its output
Observability is the ability to answer any question about a business or application through the collection and analysis of data. Succinctly, it’s an approach to understanding the operation of a system by reviewing output from the system. In the software world, observability generally is framed in the context of the ‘three pillars’ or telemetry data types: metrics, traces, and logs. Combining these three types of data gives you the power to answer questions about your business/application that you may not have known you’d need answers to when you set it up..
