Grafana Loki - Log Aggregation

Docs: https://grafana.com/docs/loki/latest/

Indexes only metadata (labels), not full log content — dramatically cheaper than full-text search systems.

LogQL Quick Reference

Log Stream Selector (required in every query)

{app="nginx"}                        # exact match
{app!="nginx"}                       # not equal
{app=~"nginx|apache"}               # regex match
{app!~"debug.*"}                     # regex not match
{app="nginx", env="prod"}           # AND (multiple labels)

Line Filters (pipeline stage 1 - put first for performance)