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Loki backed by S3 and queried via Grafana is a good, mostly FOSS solution. Installs pretty easily via helm and S3 gives a reasonable balance between cost, ease, and durability if you're in AWS already.

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That's kind of what we were thinking about as a next stack to experiment with.

How difficult have you found scaling Loki?

One concern I have with our current setup is the frequency that we need to step in and manually intervene.

What kind of issues that you see where you have to step in and intervene? We have been running Loki for a long time, and it barely requires any manual intervention apart from version upgrades.

Yes I agree with rootsu, we have been running Loki in production for over two years and rarely have to step in and fix things. It's very stable and performant.

One thing that I find hard is configuring the retention time. The docs are unclear and there are about 3 configuration parameters involved. It scares me as a non expert because I don't want to fill up all disk space but also don't want to keep too little logs.

You can log straight to s3 and use policies there to clean up old logs

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