<p>Grafana Loki is a horizontally scalable, highly available, multi-tenant log aggregation system inspired by <a href="https://prometheus.io/" target="_blank" rel="noopener">Prometheus</a>. 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.</p>
<p>Compared to other log aggregation systems, Loki:</p>
<ul>
<li>Does not do full text indexing on logs. By storing compressed, unstructured logs and only indexing metadata, Loki is simpler to operate and cheaper to run.</li>
<li>Indexes and groups log streams using the same labels you&rsquo;re already using with Prometheus, enabling you to seamlessly switch between metrics and logs using the same labels that you&rsquo;re already using with Prometheus.</li>
<li>Is an especially good fit for storing <a href="https://kubernetes.io/" target="_blank" rel="noopener">Kubernetes</a> Pod logs. Metadata such as Pod labels is automatically scraped and indexed.</li>
<li>Has native support in Grafana (needs Grafana v6.0). Loki is like Prometheus, but for logs: we prefer a multidimensional label-based approach to indexing, and want a single-binary, easy to operate system with no dependencies. Loki differs from Prometheus by focussing on logs instead of metrics, and delivering logs via push, instead of pull.</li>
</ul>

Loki

Grafana

Promtail

The kubernetes native log-aggregation system that is easy to scale.