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We're using Grafana and Loki to great effect.

Using an AGPL-licensed fork does not suffer from this risk.

ClickHouse. It's Apache 2.0 and will stay that way.

Edit to add disclaimer: I work on ClickHouse.

Loki and grafana are great, use it on all my clients eks clusters.

&

grep ( with parallel )

...if it matches your use case, you'll find it trivially outperforms elasticsearch.

Search speed is not the most important aspect at play here.