Actuator endpoints overview in Spring Boot - Performance & Optimization

Performance: Actuator endpoints overview

MEDIUM IMPACT

Actuator endpoints impact the server response time and network load, affecting how quickly monitoring data is available without slowing down the main application.

Exposing all actuator endpoints in production

Spring Boot

management.endpoints.web.exposure.include=health,info

Limits exposure to only essential endpoints, reducing server processing and network traffic.

📈 Performance Gainreduces server load and network usage, improving response speed

Exposing all actuator endpoints in production

Spring Boot

management.endpoints.web.exposure.include=*

Exposes all endpoints, increasing server processing and network traffic, which can slow down response times and increase security risks.

📉 Performance Costadds unnecessary server load and network overhead, potentially blocking main app threads

Performance Comparison

Pattern	Server Load	Network Traffic	Response Time	Verdict
Expose all endpoints	High	High	Slower	[X] Bad
Expose minimal endpoints	Low	Low	Faster	[OK] Good

Rendering Pipeline

Actuator endpoints are processed by the server and do not affect browser rendering directly but impact backend response times and network latency.

→Server Processing

→Network Transfer

⚠️ BottleneckServer Processing when many endpoints or heavy metrics are enabled

Optimization Tips

1Only expose actuator endpoints needed for monitoring.

2Avoid exposing heavy or sensitive endpoints in production.

3Use caching or asynchronous collection for expensive metrics.

Performance Quiz - 3 Questions

What is the main performance risk of exposing all actuator endpoints in production?

A Improved application startup speed

B Increased server load and slower response times

C Reduced network traffic

D Better browser rendering performance

DevTools: Network

How to check: Open DevTools, go to Network tab, trigger actuator endpoint requests, and observe response times and payload sizes.

What to look for: Look for large payloads or slow responses indicating heavy or unnecessary actuator data.

Practice

1. What is the main purpose of Spring Boot Actuator endpoints?

easy

A. To handle user authentication and authorization

B. To serve static web content like images and CSS

C. To manage database connections automatically

D. To provide information about the application's health and status

Solution

1. Step 1: Understand Actuator endpoints role

   Actuator endpoints are designed to give quick info about the app's health and status.

2. Step 2: Compare with other options

   Authentication, database management, and static content serving are not the main roles of Actuator.

3. Final Answer:

   To provide information about the application's health and status -> Option D

4. Quick Check:

   Actuator endpoints = app health info [OK]

Hint: Remember: Actuator = app health and metrics info [OK]

Common Mistakes:

• Confusing Actuator with security features
• Thinking Actuator manages database connections
• Assuming Actuator serves static files

2. Which property enables the exposure of all Actuator endpoints in Spring Boot?

easy

A. management.endpoints.web.exposure.include=*

B. spring.boot.actuator.enabled=true

C. management.endpoint.health.enabled=true

D. server.port=8080

Solution

1. Step 1: Identify property to expose endpoints

   The property management.endpoints.web.exposure.include=* exposes all Actuator endpoints.

2. Step 2: Check other options

   spring.boot.actuator.enabled is not a valid property; health endpoint enabling is specific, and server.port sets the server port.

3. Final Answer:

   management.endpoints.web.exposure.include=* -> Option A

4. Quick Check:

   Expose all endpoints = management.endpoints.web.exposure.include=* [OK]

Hint: Use '*' in exposure.include to enable all endpoints [OK]

Common Mistakes:

• Using incorrect property names
• Confusing enabling endpoints with enabling server
• Trying to enable endpoints individually without exposure property

3. Given the following configuration:

management.endpoints.web.exposure.include=health,info

Which endpoints will be accessible via HTTP?

medium

A. Only /health and /info endpoints

B. All Actuator endpoints

C. No endpoints are accessible

D. Only /metrics endpoint

Solution

1. Step 1: Read the exposure.include property

   The property lists health and info, so only these endpoints are exposed.

2. Step 2: Understand what exposure.include controls

   It controls which endpoints are accessible via HTTP; others remain hidden.

3. Final Answer:

   Only /health and /info endpoints -> Option A

4. Quick Check:

   Exposure include = health,info means only those endpoints [OK]

Hint: Check exposure.include list to know accessible endpoints [OK]

Common Mistakes:

• Assuming all endpoints are exposed by default
• Confusing exposure.include with enabling endpoints
• Thinking metrics endpoint is included without listing it

4. You configured management.endpoints.web.exposure.include=health,metrics but the /metrics endpoint returns 404. What is the likely cause?

medium

A. The metrics endpoint is disabled by default and needs explicit enabling

B. The health endpoint is conflicting with metrics

C. The application is missing the actuator dependency

D. The server port is incorrect

Solution

1. Step 1: Check if actuator dependency is present

   Without the actuator library, endpoints like /metrics won't exist, causing 404.

2. Step 2: Verify other options

   Metrics endpoint is enabled by exposure.include; health does not conflict; server port affects access but not endpoint existence.

3. Final Answer:

   The application is missing the actuator dependency -> Option C

4. Quick Check:

   Missing actuator dependency = 404 on endpoints [OK]

Hint: Always add actuator dependency to use Actuator endpoints [OK]

Common Mistakes:

• Assuming endpoints work without actuator dependency
• Blaming port or conflicts instead of missing library
• Thinking exposure.include enables endpoints without actuator

5. You want to monitor your Spring Boot app's health, info, and metrics endpoints but only expose health and info publicly. How do you configure this securely?

hard

A. Set management.endpoints.web.exposure.include=health,info,metrics and disable security

B. Set management.endpoints.web.exposure.include=health,info and secure /metrics with authentication

C. Expose all endpoints with * and rely on firewall rules

D. Disable all endpoints except metrics

Solution

1. Step 1: Expose only health and info endpoints publicly

   Use management.endpoints.web.exposure.include=health,info to expose only those endpoints.

2. Step 2: Secure metrics endpoint separately

   Keep metrics endpoint enabled internally and protect it with authentication or network rules.

3. Final Answer:

   Set management.endpoints.web.exposure.include=health,info and secure /metrics with authentication -> Option B

4. Quick Check:

   Expose only needed endpoints publicly, secure others [OK]

Hint: Expose only needed endpoints publicly; secure sensitive ones [OK]

Common Mistakes:

• Exposing all endpoints without security
• Disabling security to simplify access
• Exposing metrics publicly without protection