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Working with Prometheus Queries

Once you have begun collecting metric data in Prometheus, you will need to be able to work with that data in order to obtain information you can act upon. Prometheus provides a specialized query language known as Prometheus Query Language (PromQL) that allows you to write both simple and complex queries in order to retrieve and view your metric data in a useful way. In this hands-on lab, you will have the opportunity to work with Prometheus queries by writing and executing some simple queries.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Last updated
Clock icon Sep 03, 2025

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Table of Contents

  1. Challenge

    Get the Current Memory Usage for the LimeDrop Authentication Service

    1. Access the Prometheus expression browser in a web browser (replacing <PROMETHEUS_SERVER_PUBLIC_IP> with the public IP address of the Prometheus server):

      http://<PROMETHEUS_SERVER_PUBLIC_IP>:9090

    2. Run a query to obtain the available memory amount. Supply a label to search specifically for metrics for the limedrop-auth:4455 instance.

      mem_available_total{instance="limedrop-auth:4455"}

    3. Log in to the Prometheus server and open the output file:

      vi /home/cloud_user/auth_service_data.md

    4. Enter the current available memory on the mem_available_total line.

  2. Challenge

    Get the available memory range data over a five-minute period three minutes ago.

    1. Run a query in the expression browser to obtain the data:

      mem_available_total{instance="limedrop-auth:4455"}[5m] offset 3m

    2. Copy the output, including the timestamps.

    3. On the Prometheus server, open the output file:

      vi /home/cloud_user/auth_service_data.md

    4. Paste in the data at the end of the file.

Pluralsight Skills - Labs - Pluralsight
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Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.
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