What are Loki and ELK used for? What does ELK stand for?

Loki and ELK are tools for collecting, storing, and analyzing logs.

ELK is an acronym for:

• Elasticsearch — a search engine for storing and quickly searching logs.
• Logstash — a tool for collecting, processing, and transmitting logs.
• Kibana — a web interface for visualizing and analyzing logs.

The ELK stack allows centralized collection of logs from different services, indexing them, and visualizing for monitoring and debugging.

Loki is a logging system developed by Grafana Labs, focused on storing logs with minimal indexing. Unlike ELK, Loki indexes only metadata (e.g., labels), while the logs themselves are stored in compressed form. This helps save resources and simplifies scaling when working with large volumes of logs.

Thus, ELK is a more versatile and powerful logging stack with advanced search capabilities, while Loki is a lighter and more economical solution, well integrated with Grafana for monitoring.

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Example of using ELK: centralized collection of web server logs, filtering, and searching for errors.

Example of using Loki: collecting logs from Kubernetes with labels for quick search and visualization in Grafana.