Instrumentation and telemetry
A monitoring solution is dependent upon instrumentation and telemetry. So it is natural that when we speak about monitoring microservices, we also discuss instrumentation and telemetry data. Logs are nothing more than an instrumentation mechanism.
Instrumentation
Now let's look at what instrumentation is. Instrumentation is one of the ways through which you can add diagnostic features to applications. It can be formally defined as follows:
''Most applications will include diagnostic features that generate custom monitoring and debugging information, especially when an error occurs. This is referred to as instrumentation and is usually implemented by adding event and error handling code to the application."
-MSDN
Under normal conditions, data from informational events may not be required, thus reducing the cost of storage and the transactions required to collect it. However, when there is an issue with the application, you have to update the application configuration...
