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Linux Foundation Prometheus Certified Associate Exam Sample Questions (Q32-Q37):

NEW QUESTION # 32
What does the evaluation_interval parameter in the Prometheus configuration control?

• A. How often Prometheus compacts the TSDB data blocks.
• B. How often Prometheus scrapes targets.
• C. How often Prometheus sends metrics to remote storage.
• D. How often Prometheus evaluates recording and alerting rules.

Answer: D

Explanation:
The evaluation_interval parameter defines how frequently Prometheus evaluates its recording and alerting rules. It determines the schedule at which the rule engine runs, checking whether alert conditions are met and generating new time series for recording rules.
For example, setting:
global:
evaluation_interval: 30s
means Prometheus evaluates all configured rules every 30 seconds. This setting differs from scrape_interval, which controls how often Prometheus collects data from targets.
Having a proper evaluation interval ensures alerting latency is balanced with system performance.

NEW QUESTION # 33
What does scrape_interval configure in Prometheus?

• A. It defines how frequently to scrape targets.
• B. It defines how frequently to evaluate rules.
• C. It defines how often to send alerts.
• D. It defines how often to refresh metrics.

Answer: A

Explanation:
In Prometheus, the scrape_interval parameter specifies how frequently the Prometheus server should scrape metrics from its configured targets. Each target exposes an HTTP endpoint (usually /metrics) that Prometheus collects data from at a fixed cadence. By default, the scrape_interval is set to 1 minute, but it can be overridden globally or per job configuration in the Prometheus YAML configuration file.
This setting directly affects the resolution of collected time series data-a shorter interval increases data granularity but also adds network and storage overhead, while a longer interval reduces load but might miss short-lived metric variations.
It is important to distinguish scrape_interval from evaluation_interval, which defines how often Prometheus evaluates recording and alerting rules. Thus, scrape_interval pertains only to data collection frequency, not to alerting or rule evaluation.
Reference:
Extracted and verified from Prometheus documentation on Configuration File - scrape_interval and Scraping Fundamentals sections.

NEW QUESTION # 34
What is a rule group?

• A. It is a set of rules that are grouped by labels.
• B. It is a set of rules that are executed sequentially.
• C. It is a set of rules, split into groups by type.
• D. It is the set (the group) of all the rules in a file.

Answer: B

Explanation:
In Prometheus, a rule group is a logical collection of recording and alerting rules that are evaluated sequentially at a specified interval. Rule groups are defined in YAML files under the groups: key, with each group containing a name, an interval, and a list of rules.
For example:
groups:
- name: example
interval: 1m
rules:
- record: job:http_inprogress_requests:sum
expr: sum(http_inprogress_requests) by (job)
All rules in a group share the same evaluation schedule and are executed one after another. This ensures deterministic order, especially when one rule depends on another's result.
Reference:
Verified from Prometheus documentation - Rule Configuration, Rule Groups and Evaluation Order, and Recording & Alerting Rules Guide.

NEW QUESTION # 35
Which field in alerting rules files indicates the time an alert needs to go from pending to firing state?

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

Answer: B

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 # 36
How would you name a metric that tracks HTTP request duration?

• A. http_request_duration_seconds
• B. http.request_latency
• C. request_duration_seconds
• D. http_request_duration

Answer: A

Explanation:
According to Prometheus metric naming conventions, a metric name must clearly describe what is being measured and include a unit suffix that specifies the base unit of measurement, following SI standards. For durations, the suffix _seconds is mandatory.
Therefore, the correct and standards-compliant name for a metric tracking HTTP request duration is:
http_request_duration_seconds
This name communicates:
http_request → the subject being measured (HTTP requests),
duration → the aspect being measured (the latency or time taken),
_seconds → the unit of measurement (seconds).
This metric name typically corresponds to a histogram or summary, exposing submetrics such as _count, _sum, and _bucket. These represent the number of observations, total duration, and distribution across time buckets respectively.
Options A, B, and C fail to fully comply with Prometheus naming standards - they either omit the http_ prefix, use invalid separators (dots), or lack the required unit suffix.
Reference:
Verified from Prometheus documentation - Metric and Label Naming Conventions, Instrumentation Best Practices, and Histogram and Summary Metric Naming Patterns.

NEW QUESTION # 37
......

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