Loki

Overview

Loki indexes only the labels attached to log streams; the log lines themselves are compressed into chunks. Writes are fast and storage is cheap, and LogQL (a PromQL-like language) still lets you filter, parse and aggregate lines. This skill covers a single-node Docker deployment (Loki 3.7), shipping logs with Grafana Alloy, LogQL queries, and the Grafana integration.

Promtail reached end of life on 2 March 2026 and receives no updates. Use Grafana Alloy as the agent. Existing Promtail configs convert with alloy convert --source-format=promtail --output=config.alloy promtail.yml.

Instructions

Deploy Loki and Alloy with Docker Compose