Grafana Mimir – Horizontally scalable long-term storage for Prometheus

Re:Grafana Mimir – Horizontally scalable long-term storage f... by vladvasiliu on Wednesday March 30, 2022 @12:08PM (#30857136)

While I agree with your point in the general case, would you mind elaborating on the specific case of Prometheus?

My understanding is that the recommended best-practice for Prometheus is to deploy as many of them as necessary, as close to the monitored infrastructure as possible.

What use case would require deploying a single Mimir, so supposedly Prometheus (cluster) in the case of serving multiple tenants? Why not just deploy a dedicated Prometheus / Mimir stack per client?

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Re:Grafana Mimir – Horizontally scalable long-term storage f... by notacoward on Thursday March 31, 2022 @07:34PM (#30873478)

I don't know Prometheus, but I would imagine the answer depends on just how many clients you have. Probably doesn't matter if you're talking just a few. If it's a lot, then separate instances can be very expensive in terms of operational complexity and waste due to resource fragmentation. Multi-tenancy is good for bringing both of those back under control. Is there something about Prometheus that would negate that?

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Re:Grafana Mimir – Horizontally scalable long-term storage f... by vladvasiliu on Friday April 01, 2022 @01:48AM (#30875516)

For one, it doesn't really support authentication (although it's on the roadmap).

I'm no Prometheus expert, but since you're pretty much expected to be running a bunch of servers anyway, the operational complexity has to be handled even for just one client.

You do have a point on resource fragmentation, but IME Prometheus' resource usage is fairly predictable, so you could probably mitigate that to a point.

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