Metrics with Micrometer in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a counter metric using Micrometer.

Spring Boot

Counter counter = Counter.builder("[1]")
    .description("Counts user logins")
    .register(meterRegistry);

Drag options to blanks, or click blank then click option'

Auser_logins_total

BloginCounter

CuserLoginCount

DcounterUserLogins

Attempts:

3 left

💡 Hint

Common Mistakes

Using camelCase instead of snake_case for metric names.

Using variable names instead of metric names.

The metric name should be a clear, dot-separated string like user_logins_total to follow Micrometer naming conventions.

2fill in blank

medium

Complete the code to increment the counter when a user logs in.

Spring Boot

public void onUserLogin() {
    [1].increment();
}

Drag options to blanks, or click blank then click option'

AmeterRegistry.counter("user_logins_total")

BCounter.builder("user_logins_total")

Ccounter

DmeterRegistry.get("user_logins_total")

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to create a new counter inside the method.

Using meterRegistry.counter() inside the method instead of the existing counter.

You increment the existing counter object, not create or get a new one each time.

3fill in blank

hard

Fix the error in the code to record a timer metric for method execution time.

Spring Boot

Timer timer = Timer.builder("[1]")
    .description("Execution time of processData")
    .register(meterRegistry);

public void processData() {
    timer.[2](() -> {
        // processing logic
    });
}

Drag options to blanks, or click blank then click option'

Aprocess_data_time

Brecord

CrecordCallable

Dtime

Attempts:

3 left

💡 Hint

Common Mistakes

Using camelCase for metric names.

Using time instead of record for timing code blocks.

The timer metric name should be descriptive and use underscores. The method to record execution time with a Runnable is record.

4fill in blank

hard

Fill both blanks to create a gauge metric that tracks the current size of a queue.

Spring Boot

Gauge.builder("[1]", queue, [2])
    .description("Current size of the task queue")
    .register(meterRegistry);

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Atask_queue_size

Bqueue::size

Cqueue.size()

DgetSize

Attempts:

3 left

💡 Hint

Common Mistakes

Calling queue.size() directly instead of passing a method reference.

Using camelCase for metric names.

The gauge name should be descriptive and use underscores. The method reference queue::size correctly provides the current size.

5fill in blank

hard

Fill all three blanks to create a custom meter with tags and record a value.

Spring Boot

DistributionSummary summary = DistributionSummary.builder("[1]")
    .description("Response sizes")
    .tags("endpoint", "[2]")
    .register(meterRegistry);

summary.[3](responseSize);

Drag options to blanks, or click blank then click option'

Aresponse_size_bytes

B/api/data

Crecord

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using count instead of record to add values.

Using generic or unclear metric names.

The metric name should be descriptive. Tags add context like the endpoint. Use record to add a new value to the summary.