Change release date to July of 2021

radar/2021-07-01/loki.md

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+---
+title: "Loki"
+ring: trial
+quadrant: tools
+featured: true
+---
+
+Archiving indexed log data with a system like Elasticsearch can be expensive and archiving it as simple text files makes it hard to query them.
+[Loki](https://grafana.com/oss/loki/) solves this issue by adding a reference database based on Kubernetes labels to each log line similar to Prometheus, but holding the log data inside a simple blob storage like S3.
+This allows the user to query the data by pre-defined labels and keeps the costs for indexing low.
+
+Another benefit is the fact that does not have an endpoint for mutating log data which makes the data immutable from a potential compromised system.
+
+We at AOE are using it for longer term log archiving in several Kubernetes clusters.