PCA Instrumentation And Exporters Practice Test 3 — 15 Questions

Question 1

Which THREE of the following are valid metric types in Prometheus?

Accepted Answer

Gauge. The four main metric types supported by Prometheus are Counter, Gauge, Histogram, and Summary.

Answer

Set

Answer

Queue

Question 2

What does the `_count` suffix denote in a summary or histogram?

Accepted Answer

The total number of samples. The _count suffix represents the total number of observations made for that specific metric.

Answer

The maximum value

Answer

The sum of values

Answer

The current bucket value

Question 3

Why are metric names required to follow a specific character set (e.g., alphanumeric and colons)?

Accepted Answer

For compatibility with PromQL. Prometheus metric names must match a regex to ensure they are compatible with the query language and internal storage format.

Answer

For faster scraping

Answer

To save disk space

Answer

To prevent duplicate metrics

Question 4

Which tool would you use to monitor the availability of a website from various geographic locations?

Accepted Answer

blackbox_exporter. The blackbox_exporter is the standard tool for probing the availability of HTTP, TCP, or DNS services.

Answer

node_exporter

Answer

Pushgateway

Answer

Prometheus API

Question 5

When instrumenting an application, why is it recommended to use a fixed set of label names?

Accepted Answer

To avoid cardinality explosion. Dynamically changing label names creates new time series, which can lead to cardinality explosion and storage issues.

Answer

To increase resolution

Answer

For better formatting

Answer

To simplify coding

Question 6

Which TWO of the following are common reasons to use the Pushgateway?

Accepted Answer

For batch jobs that run for seconds. Pushgateway is used for batch jobs that finish quickly and for processes that are behind a firewall.

Answer

To monitor long-running servers

Answer

To act as a reverse proxy

Answer

When metrics need to be stored in SQL

Question 7

Which TWO of the following are true about the node_exporter?

Accepted Answer

It runs on port 9100 by default. Node exporter is designed for *NIX systems and exposes metrics on port 9100.

Answer

It is for database monitoring

Answer

It performs active monitoring

Answer

It supports Windows out of the box

Question 8

Which TWO of the following are true regarding Prometheus Histograms?

Accepted Answer

They are cumulative. Histograms consist of cumulative counters and allow for server-side quantile calculation.

Answer

They calculate quantiles client-side

Answer

They do not use labels

Answer

They are only for Gauges

Question 9

Which TWO of the following are true about the Blackbox exporter?

Accepted Answer

It supports HTTP, TCP, and DNS. It is used for active probing and supports multiple modules for different protocols.

Answer

It is the only exporter for databases

Answer

It automatically instruments application code

Answer

It is a passive metric collector

Question 10

Which THREE components are typically involved in the standard Prometheus instrumentation and scraping process?

Accepted Answer

Client library. The process involves the application (instrumented via client library), the exporter (or the application itself), and the Prometheus server (the scraper).

Answer

Grafana

Answer

Alertmanager

Question 11

Which THREE of the following are standard ways to handle Prometheus metrics?

Accepted Answer

Use official client libraries. Common methods include using official client libraries, using exporters, and the textfile collector.

Answer

Directly update Prometheus files on disk

Answer

Write metrics to a central database

Question 12

Which THREE of the following are key design considerations when creating a custom exporter?

Accepted Answer

Expose metrics in Prometheus text format. Key factors include avoiding high cardinality, ensuring the metrics are exposed via HTTP, and keeping performance overhead low.

Answer

Only export metrics once a day

Answer

Use JSON for metric output

Question 13

Which THREE of the following are true about the Prometheus Text Exposition Format?

Accepted Answer

It is line-oriented. It is line-oriented, supports comments starting with #, and each metric line contains the name, optional labels, and value.

Answer

It is a binary protocol

Answer

It requires an XML schema

Question 14

Which TWO of the following are true about the Gauge metric type?

Accepted Answer

Used for memory usage. Gauges allow values to fluctuate and are often used for memory, CPU, or queue length.

Answer

Values can only increase

Answer

Calculates quantiles

Answer

Values are always integers

Question 15

Which THREE of the following are common issues that cause scraping failures?

Accepted Answer

Network connectivity issues. Common issues include network connectivity, incorrect scrape configurations, and exporter timeouts.

Answer

Lack of data in the database

Answer

Too many dashboards in Grafana