A Prometheus instance scrapes 500 targets, each exposing hundreds of metrics. A frequently used dashboard query computes the 95th percentile of request latency across all instances using a histogram metric. The query is slow and consumes significant CPU. The team wants to improve dashboard performance without changing the underlying data. What is the most effective approach?

Reduce the scrape interval to 30s to have fewer data points to process.

Use the 'irate' function instead of 'rate' in the dashboard query to make it faster.

Create a recording rule that precomputes the histogram_quantile(0.95, sum(rate(http_request_duration_seconds_bucket[5m])) by (le)) and store it as a new metric.

Increase the evaluation interval of all alerting rules to reduce CPU usage.

A team monitors a fleet of web servers. Each server exposes a counter 'http_requests_total' with a label 'status' (e.g., '200', '404', '500'). The team wants a PromQL query that shows the per-second rate of requests per status code, averaged across all servers, for the last 5 minutes. Which query achieves this?

avg(rate(http_requests_total[5m])) by (status)

rate(avg(http_requests_total[5m])) by (status)

sum(rate(http_requests_total[5m])) by (status)

avg(irate(http_requests_total[5m])) by (status)

A service exposes a gauge 'temperature_celsius' with a label 'sensor_id'. There are 10 sensors. The team wants to know the current maximum temperature across all sensors. Which PromQL query returns this?

max_over_time(temperature_celsius[5m])

max(temperature_celsius) by (sensor_id)

What is the purpose of a recording rule in Prometheus?

To precompute frequently used queries and store the results as new time series

LPI DevOps Tools Engineer

Domain 4Objective 2

704.2 Prometheus Monitoring (weight: 6) DEVOPS-TOOLS-ENGINEER Practice Questions (Page 7)

Part of the 704 Security and Observability domain, which makes up ~26% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 90-minute exam (~35–60 total, ~9–16 in this domain), expect 2–4 from this objective — we provide 38 practice questions to prepare you well beyond it. (estimate)

38questions here

8free pages

13concepts

13 Concepts in This Objective

Prometheus architecture and components
Metrics collection and exposition formats
PromQL queries and data selection
PromQL aggregation and rate calculations
Prometheus configuration for targets and scraping
Service discovery and dynamic target management
Alerting rules and Alertmanager integration
Recording rules and rule evaluation
Prometheus data model and storage
Exporters and instrumentation
Pushgateway for short-lived jobs
Prometheus federation and high availability
Troubleshooting and debugging Prometheus

Questions 31–35

31foundation · easy
Which HTTP method is used to push metrics to the Pushgateway?
Select an answer first
32application · medium
A Prometheus instance scrapes 500 targets, each exposing hundreds of metrics. A frequently used dashboard query computes the 95th percentile of request latency across all instances using a histogram metric. The query is slow and consumes significant CPU. The team wants to improve dashboard performance without changing the underlying data. What is the most effective approach?
Select an answer first
33application · medium
A team monitors a fleet of web servers. Each server exposes a counter 'http_requests_total' with a label 'status' (e.g., '200', '404', '500'). The team wants a PromQL query that shows the per-second rate of requests per status code, averaged across all servers, for the last 5 minutes. Which query achieves this?
Select an answer first
34application · easy
A service exposes a gauge 'temperature_celsius' with a label 'sensor_id'. There are 10 sensors. The team wants to know the current maximum temperature across all sensors. Which PromQL query returns this?
Select an answer first
35foundation · easy
What is the purpose of a recording rule in Prometheus?
Select an answer first

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704.2 Prometheus Monitoring (weight: 6) DEVOPS-TOOLS-ENGINEER Practice Questions (Page 7)

Questions 31–35

Which HTTP method is used to push metrics to the Pushgateway?

A service exposes a gauge 'temperature_celsius' with a label 'sensor_id'. There are 10 sensors. The team wants to know the current maximum temperature across all sensors. Which PromQL query returns this?

What is the purpose of a recording rule in Prometheus?

Keep studying — 704 Security and Observability