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Linux Foundation Prometheus Certified Associate Exam Sample Questions (Q43-Q48):

NEW QUESTION # 43
What is a rule group?

Answer: C

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 # 44
Which of the following PromQL queries is invalid?

Answer: B

Explanation:
The max operator in PromQL is an aggregation operator, not a binary vector matching operator. Therefore, the valid syntax for aggregation uses by() or without(), not on().
✅ max by (instance) up → Valid; aggregates maximum values per instance.
✅ max without (instance) up and max without (instance, job) up → Valid; aggregates over all labels except those listed.
❌ max on (instance) (up) → Invalid; the keyword on() is only valid in binary operations (e.g., +, -, and, or, unless), where two vectors are being matched on specific labels.
Hence, max on (instance) (up) is a syntax error in PromQL because on() cannot be used directly with aggregation operators.
Reference:
Verified from Prometheus documentation - Aggregation Operators, Vector Matching - on()/ignoring(), and PromQL Language Syntax Reference sections.


NEW QUESTION # 45
What are the four golden signals of monitoring as defined by Google's SRE principles?

Answer: A

Explanation:
The Four Golden Signals-Traffic, Errors, Latency, and Saturation-are key service-level indicators defined by Google's Site Reliability Engineering (SRE) discipline.
Traffic: Demand placed on the system (e.g., requests per second).
Errors: Rate of failed requests.
Latency: Time taken to serve requests.
Saturation: How "full" the system resources are (CPU, memory, etc.).
Prometheus and its metrics-based model are ideal for capturing these signals.


NEW QUESTION # 46
What does the rate() function in PromQL return?

Answer: B

Explanation:
The rate() function calculates the average per-second rate of increase of a counter over the specified range. It smooths out short-term fluctuations and adjusts for counter resets.
Example:
rate(http_requests_total[5m])
returns the number of requests per second averaged over the last five minutes. This function is frequently used in dashboards and alerting expressions.


NEW QUESTION # 47
How do you calculate the average request duration during the last 5 minutes from a histogram or summary called http_request_duration_seconds?

Answer: D

Explanation:
In Prometheus, histograms and summaries expose metrics with _sum and _count suffixes to represent total accumulated values and sample counts, respectively. To compute the average request duration over a given time window (for example, 5 minutes), you divide the rate of increase of _sum by the rate of increase of _count:
ext{Average duration} = rac{ ext{rate(http_request_duration_seconds_sum[5m])}}{ ext{rate(http_request_duration_seconds_count[5m])}} Here,
http_request_duration_seconds_sum represents the total accumulated request time, and
http_request_duration_seconds_count represents the number of requests observed.
By dividing these rates, you obtain the average request duration per request over the specified time range.
Reference:
Extracted and verified from Prometheus documentation - Querying Histograms and Summaries, PromQL Rate Function, and Metric Naming Conventions sections.


NEW QUESTION # 48
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