Enabling cloud-native behaviors

We have just developed a basic service with two APIs that respond to requests. Let's add a few capabilities that will enable to it to be a good cloud citizen. We will discuss the following:

• Externalizing configuration
• Instrumentation—health and metrics
• Service registration and discovery

Externalizing configuration

Configuration can be any property that is likely to differ between environments or production deployments. Typical examples are queue and topic names, ports, URLs, connection and pool properties, and so on.

A deployable should not have configuration in it. A configuration should be injected from outside. This makes the deployable unit immutable as it goes through the...