Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation system inspired by Prometheus. It is designed to be very cost effective and easy to operate. It does not index the contents of the logs, but rather a set of labels for each log stream. It is especially good fit for storing Kubernetes Pod logs. Metadata such as Pod labels is automatically scraped and indexed. By storing compressed, unstructured logs and only indexing metadata, Loki is simpler to operate and cheaper to run.