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Like Prometheus, but for logs.
Grafana Loki is a set of open source components that can be composed into a fully featured logging stack. A small index and highly compressed chunks simplifies the operation and significantly lowers the cost of Loki.
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.