DevOps with Kubernetes - Second Edition

Monitoring applications

The data we are concerned with relates to the internal states of our running application. Collecting this data gives us more information about what's going on inside our service. The data may be to do with the goal the application is designed to achieve, or the runtime data intrinsic to the application. Obtaining this data often requires us to manually instruct our program to expose the internal data to the monitoring pipeline because only we, the service owner, know what data is meaningful, and also because it's often hard to get information such as the size of records in the memory for a cache service externally.

The ways in which applications interact with the monitoring system differ significantly. For example, ...