Grafana Loki is a horizontally scalable and highly available multi-tenant log aggregation system inspired by Prometheus. Loki only indexes metadata about your logs as a set of labels for each log stream. Log data is stored in a block storage solution such as S3, GCS or Azure Blob Storage. The upshot is that Loki promises a reduction in operational complexity and storage costs over competitors. As you'd expect, it integrates tightly with Grafana and Grafana Alloy, although other collection mechanisms can be used.
Loki 3.0 introduced native OpenTelemetry support, making ingestion and integration with OpenTelemetry systems as simple as configuring an endpoint. It also offers advanced multi-tenancy features, such as tenant isolation via shuffle-sharding, which prevents misbehaving tenants (e.g., heavy queries or outages) from impacting others in a cluster. If you haven't been following developments in the Grafana ecosystem, now is a great time to take a look as it is evolving rapidly.
