PCA Metric Collection & Data Modeling 2

Question 1

Which Prometheus metric type is best suited for tracking the number of currently active HTTP connections?

Accepted Answer

Gauge

Answer

Gauges represent values that can go up or down, making them ideal for measuring currently active connections.

Question 2

In Prometheus, what does the `le` label represent in a histogram metric?

Accepted Answer

Less than or equal to bucket boundary

Answer

The `le` label in histograms denotes the upper inclusive bound ('less than or equal to') for each bucket.

Question 3

A Prometheus scrape target returns a metric with timestamp older than the staleness window. What happens?

Accepted Answer

Prometheus stores the stale sample with a special NaN value

Answer

Prometheus marks stale samples with a special staleness NaN marker to signal that the time series is no longer active.

Question 4

Which exposition format does Prometheus use by default when scraping targets?

Accepted Answer

Plain text exposition format

Answer

Prometheus defaults to the plain text exposition format (version 0.0.4) when scraping targets.

Question 5

What is the purpose of the `_total` suffix convention in Prometheus counter metrics?

Accepted Answer

It is required by the OpenMetrics specification for counters

Answer

The OpenMetrics specification requires counters to use the `_total` suffix to clearly indicate they are monotonically increasing totals.

(PCA) Prometheus Certified Associate Practice Test