Actuator provides operational endpoints, but endpoint exposure and authorization are separate decisions. Publish only information appropriate for its audience.
Before you start
You should know Java classes, dependency injection and basic HTTP requests. Identify where a call crosses a framework-managed boundary. The snippets illustrate a focused mechanism; database configuration, application wiring and authentication must be supplied by the surrounding application when applicable.
The practical goal is to reason through this situation: A public readiness endpoint need not reveal configuration, environment or heap details. Read the walkthrough first, then try the interview exercise before opening its answer. The important part is explaining the decision and its consequences, rather than remembering a definition alone.
Step-by-step walkthrough
Step 1: Choose required operations
List endpoints actually needed for monitoring and support.
Step 2: Separate exposure from access
Publishing an endpoint and authorizing its callers are independent settings.
Step 3: Verify deployed reachability
Inspect network boundaries and authenticated access rather than trusting configuration names.
Worked scenario
A public readiness endpoint need not reveal configuration, environment or heap details.
Public readiness can provide a minimal status while environment, heap and configuration information remains restricted. Exposing every actuator endpoint increases the information available to visitors and can create operational risk. A management port is not private merely because it differs from the application port.
Common mistake
Exposing all endpoints can disclose sensitive operational data.
Verify the behavior
Attempt public and privileged access to each enabled endpoint from its real network boundary.
Interview exercise
Create an operations endpoint policy.
Answer and reasoning
Select required endpoints, restrict privileged ones and verify their actual network and authentication boundaries.
Continue learning
Compare the scenario with the Spring Boot interview questions and test your understanding with the Spring Boot MCQs. For terminology and implementation details, consult the reference material.