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DevOps & Automation · Advanced

Loki

A horizontally scalable log aggregation system from Grafana Labs that indexes only log labels, not full log content.

Definition

Loki stores compressed log chunks and indexes metadata labels, making it cheaper than full-text indexing systems. It is queried with LogQL and often fed by Promtail, Grafana Alloy, or Fluent Bit.

Example

{namespace="payments"} |= "timeout" finds payment logs containing 'timeout'.

Exam tip

Loki's label-only indexing is its key difference from Elasticsearch.

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