How to Install Prometheus and Grafana on Ubuntu 22.04 LTS — Configure Grafana Dashboard

What is Prometheus ?

• Prometheus is an open-source Linux Server Monitoring tool mainly used for metrics monitoring, event monitoring, alert management, etc.
• Prometheus has changed the way of monitoring systems and that is why it has become the Top-Level project of the Cloud Native Computing Foundation (CNCF).

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• Prometheus uses a powerful query language i.e. “PromQL”.
• In Prometheus, tabs are on and handle hundreds of services and microservices.
• Prometheus uses multiple modes for graphing and dashboarding support.

Prometheus Components

1. Prometheus Server

• The Prometheus server is the first component of Prometheus architecture.
• Prometheus server is a core of Prometheus architecture which is divided into several parts like Storage, PromQL, HTTP server, etc.
• In Prometheus server data is scraped from the target nodes and then stored in the database.
• 1.a. Storage
• Storage in the Prometheus server has local on-disk storage.
• Prometheus has many interfaces that allow integration with remote storage systems.

1.b. PromQL

• Prometheus uses its query language i.e. PromQL which is a very powerful querying language.
• PromQL allows the user to select and aggregate the data.

2. Service Discovery

• The next and very important component of the Prometheus Server is the Service Discovery.
• With the help of Service discovery, the services are identified which are need to scraped.
• To Pull metrics, identification of services and finding the targets are compulsorily needed.
• Through Service discovery, we monitor the entities and can also locate their targets.

3. Scrape Target

• Once the services are identified and the targets are ready then we can pull metrics from it and can scrape the target.
• We can export the data of the endpoint using node exporters.