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Linux Foundation Prometheus Certified Associate Exam Sample Questions (Q54-Q59):

NEW QUESTION # 54
What is the role of the Pushgateway in Prometheus?

A. To store metrics long-term for historical analysis.
B. To visualize metrics in Grafana.
C. To receive metrics pushed by short-lived batch jobs for later scraping by Prometheus.
D. To scrape short-lived targets directly.

Answer: C

Explanation:
The Pushgateway is a Prometheus component used to handle short-lived batch jobs that cannot be scraped directly. These jobs push their metrics to the Pushgateway, which then exposes them for Prometheus to scrape.
This ensures metrics persist beyond the job's lifetime. However, it's not designed for continuously running services, as metrics in the Pushgateway remain static until replaced.

NEW QUESTION # 55
How would you name a metric that measures gRPC response size?

A. grpc_response_size_bytes
B. grpc_response_size
C. grpc_response_size_sum
D. grpc_response_size_total

Answer: A

Explanation:
Following Prometheus's metric naming conventions, every metric should indicate:
What it measures (the quantity or event).
The unit of measurement in base SI units as a suffix.
Since the metric measures response size, the base unit is bytes. Therefore, the correct and compliant metric name is:
grpc_response_size_bytes
This clearly communicates that it measures gRPC response payload sizes expressed in bytes.
The _bytes suffix is the Prometheus-recommended unit indicator for data sizes. The other options violate naming rules:
_total is reserved for counters.
_sum is used internally by histograms or summaries.
Omitting the unit (grpc_response_size) is discouraged, as it reduces clarity.
Reference:
Extracted and verified from Prometheus documentation - Metric Naming Conventions, Instrumentation Best Practices, and Standard Units for Size and Time Measurements.

NEW QUESTION # 56
Which of the following signal belongs to symptom-based alerting?

A. Database memory utilization
B. API latency
C. Disk space
D. CPU usage

Answer: B

Explanation:
Symptom-based alerting focuses on user-visible problems or service-impacting symptoms rather than low-level resource metrics. In Prometheus and Site Reliability Engineering (SRE) practices, alerts should signal conditions that affect users' experience - such as high latency, request failures, or service unavailability - instead of merely reflecting internal resource states.
Among the options, API latency directly represents the performance perceived by end users. If API response times increase, it immediately impacts user satisfaction and indicates a possible service degradation.
In contrast, metrics like disk space, CPU usage, or database memory utilization are cause-based metrics - they may correlate with problems but do not always translate into observable user impact.
Prometheus alerting best practices recommend alerting on symptoms (via RED metrics - Rate, Errors, Duration) while using cause-based metrics for deeper investigation and diagnosis, not for immediate paging alerts.
Reference:
Verified from Prometheus documentation - Alerting Best Practices, Symptom vs. Cause Alerting, and RED/USE Monitoring Principles sections.

NEW QUESTION # 57
How would you correctly name a metric that provides metadata information about the binary?

A. app_build
B. app_build_info
C. app_metadata
D. app_build_desc

Answer: B

Explanation:
The Prometheus naming convention for metrics that expose build or version information about an application binary uses the _info suffix. The standard pattern is:
<application>_build_info
This metric typically includes constant labels such as version, revision, branch, and goversion to describe the build environment.
For example:
app_build_info{version="1.2.3", revision="abc123", goversion="go1.22"} 1 This approach follows the official Prometheus instrumentation guidelines, where metrics ending in _info convey metadata or constant characteristics about the running process.
The other options do not conform to the Prometheus best practice of suffix-based semantic naming.
Reference:
Extracted and verified from Prometheus documentation - Metric Naming Conventions, Exposing Build Information, and Standard _info Metrics sections.

NEW QUESTION # 58
What are Inhibition rules?

A. Inhibition rules inspect alerts when a matching set of alerts is firing.
B. Inhibition rules inject a new set of alerts when a matching alert is firing.
C. Inhibition rules mute a set of alerts when another matching alert is firing.
D. Inhibition rules repeat a set of alerts when another matching alert is firing.

Answer: C

Explanation:
Inhibition rules in Prometheus's Alertmanager are used to suppress (mute) alerts that would otherwise be redundant when a higher-priority or related alert is already active. This feature helps avoid alert noise and ensures that operators focus on the root cause rather than multiple cascading symptoms.
For example, if a "DatacenterDown" alert is firing, inhibition rules can mute all "InstanceDown" alerts that share the same datacenter label, preventing redundant notifications. Inhibition is configured in the Alertmanager configuration file under the inhibit_rules section.
Each rule defines:
A source match (the alert that triggers inhibition),
A target match (the alert to mute), and
A match condition (labels that must be equal for inhibition to apply).
Only when the source alert is active are the target alerts silenced.
Reference:
Verified from Prometheus documentation - Alertmanager Configuration - Inhibition Rules, Alert Deduplication and Grouping, and Alert Routing Best Practices.

NEW QUESTION # 59
......

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