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Linux Foundation Prometheus Certified Associate Exam Sample Questions (Q40-Q45):

NEW QUESTION # 40
What is considered the best practice when working with alerting notifications?

• A. Make sure to generate alerts on every metric of every component of the stack.
• B. Have as many alerts as possible to catch minor problems before they become outages.
• C. Minor alerts are as important as major alerts and should be treated with equal care.
• D. Have as few alerts as possible by alerting only when symptoms might become externally visible.

Answer: D

Explanation:
The Prometheus alerting philosophy emphasizes signal over noise - meaning alerts should focus only on actionable and user-impacting issues. The best practice is to alert on symptoms that indicate potential or actual user-visible problems, not on every internal metric anomaly.
This approach reduces alert fatigue, avoids desensitizing operators, and ensures high-priority alerts get the attention they deserve. For example, alerting on "service unavailable" or "latency exceeding SLO" is more effective than alerting on "CPU above 80%" or "disk usage increasing," which may not directly affect users.
Option B correctly reflects this principle: keep alerts meaningful, few, and symptom-based. The other options contradict core best practices by promoting excessive or equal-weight alerting, which can overwhelm operations teams.
Reference:
Verified from Prometheus documentation - Alerting Best Practices, Alertmanager Design Philosophy, and Prometheus Monitoring and Reliability Engineering Principles.

 

NEW QUESTION # 41
Which Prometheus component handles service discovery?

• A. Pushgateway
• B. Prometheus Server
• C. Node Exporter
• D. Alertmanager

Answer: B

Explanation:
The Prometheus Server is responsible for service discovery, which identifies the list of targets to scrape. It integrates with multiple service discovery mechanisms such as Kubernetes, Consul, EC2, and static configurations.
This allows Prometheus to automatically adapt to dynamic environments without manual reconfiguration.

 

NEW QUESTION # 42
Which field in alerting rules files indicates the time an alert needs to go from pending to firing state?

• A. interval
• B. timeout
• C. duration
• D. for

Answer: D

Explanation:
In Prometheus alerting rules, the for field specifies how long a condition must remain true continuously before the alert transitions from the pending to the firing state. This feature prevents transient spikes or brief metric fluctuations from triggering false alerts.
Example:
alert: HighRequestLatency
expr: http_request_duration_seconds_avg > 1
for: 5m
labels:
severity: warning
annotations:
description: "Request latency is above 1s for more than 5 minutes."
In this configuration, Prometheus evaluates the expression every rule evaluation cycle. The alert only fires if the condition (http_request_duration_seconds_avg > 1) remains true for 5 consecutive minutes. If it returns to normal before that duration, the alert resets and never fires.
This mechanism adds stability and noise reduction to alerting systems by ensuring only sustained issues generate notifications.
Reference:
Verified from Prometheus documentation - Alerting Rules Configuration Syntax, Pending vs. Firing States, and Best Practices for Alert Timing and Thresholds sections.

 

NEW QUESTION # 43
What is the name of the official *nix OS kernel metrics exporter?

• A. os_exporter
• B. node_exporter
• C. metrics_exporter
• D. Prometheus_exporter

Answer: B

Explanation:
The official Prometheus exporter for collecting system-level and kernel-related metrics from Linux and other UNIX-like operating systems is the Node Exporter.
The Node Exporter exposes hardware and OS metrics including CPU load, memory usage, disk I/O, network traffic, and kernel statistics. It is designed to provide host-level observability and serves data at the default endpoint :9100/metrics in the standard Prometheus exposition text format.
This exporter is part of the official Prometheus ecosystem and is widely deployed for infrastructure monitoring. None of the other listed options (Prometheus_exporter, metrics_exporter, or os_exporter) are official components of the Prometheus project.
Reference:
Verified from Prometheus documentation - Node Exporter Overview, System Metrics Collection, and Official Exporters List.

 

NEW QUESTION # 44
What function calculates the tp-quantile from a histogram?

• A. histogram_quantile()
• B. avg_over_time()
• C. histogram()
• D. predict_linear()

Answer: A

Explanation:
In Prometheus, the histogram_quantile() function is specifically designed to compute quantiles (such as tp90, tp95, or tp99) from histogram bucket data. A histogram metric records cumulative bucket counts for observed values under specific thresholds (le label).
The function works by interpolating between buckets based on the target quantile. For example, to compute the 90th percentile latency from a histogram named http_request_duration_seconds_bucket, you would use:
histogram_quantile(0.9, sum(rate(http_request_duration_seconds_bucket[5m])) by (le)) Here, 0.9 represents the tp90 quantile, and rate() converts counter increments into per-second rates.
Other options are incorrect:
histogram() is not a valid PromQL function.
predict_linear() forecasts future values of a time series.
avg_over_time() computes a simple average over a time window, not quantiles.
Reference:
Verified from Prometheus documentation - PromQL Function: histogram_quantile(), Working with Histograms, and Quantile Calculation Details.

 

NEW QUESTION # 45
......

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