Prometheus for metrics collection in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Prometheus in the context of Kubernetes?

Prometheus is an open-source tool used to collect and store metrics from Kubernetes clusters. It helps monitor the health and performance of applications and infrastructure.

beginner

How does Prometheus collect metrics from Kubernetes?

Prometheus collects metrics by scraping HTTP endpoints exposed by Kubernetes components and applications. These endpoints provide data in a format Prometheus understands.

beginner

What is a 'scrape target' in Prometheus?

A scrape target is any endpoint that Prometheus regularly contacts to collect metrics. In Kubernetes, these targets are often pods or services exposing metrics endpoints.

intermediate

What role does the Prometheus Operator play in Kubernetes?

The Prometheus Operator simplifies deploying and managing Prometheus instances in Kubernetes. It automates configuration and lifecycle management using Kubernetes custom resources.

intermediate

Why is Prometheus considered a pull-based monitoring system?

Prometheus uses a pull model where it actively scrapes metrics from targets at regular intervals, unlike push models where targets send data to the monitoring system.

What format does Prometheus expect metrics to be exposed in?

A Plain text format with specific metric syntax

B JSON format

C XML format

D Binary format

Prometheus expects metrics in a plain text format with a specific syntax that includes metric names, labels, and values.

Which Kubernetes resource does the Prometheus Operator use to manage Prometheus instances?

A ConfigMaps

B Custom Resource Definitions (CRDs)

C Secrets

D Pods

The Prometheus Operator uses Custom Resource Definitions (CRDs) to define and manage Prometheus instances declaratively.

How does Prometheus discover targets in a Kubernetes cluster?

A Manually listing IP addresses

B Through log files

C Using DNS only

D Using Kubernetes service discovery APIs

Prometheus uses Kubernetes service discovery APIs to automatically find endpoints to scrape metrics from.

What is the default data storage method used by Prometheus?

A Relational database

B Cloud storage

C Local disk storage

D In-memory only

Prometheus stores time-series data locally on disk by default, optimized for fast reads and writes.

Which protocol does Prometheus use to scrape metrics endpoints?

A HTTP

B FTP

C SSH

D SMTP

Prometheus scrapes metrics endpoints over HTTP, requesting metrics data in a specific format.

Explain how Prometheus collects and stores metrics in a Kubernetes environment.

Think about how Prometheus finds targets and what it does with the data.

Describe the benefits of using the Prometheus Operator in Kubernetes.

Focus on how it helps manage Prometheus instances.