Multi-Tenancy for metrics and alerts

[Rotfuks]

Motivation

Now that we have a general multi tenancy concept and aligned our logging to it, we need to also align metrics and alerts with this tenant concept to truely have data isolation and multi tenancy on all of our components across the observability platform.

Stories

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1. Align Multi-Tenancy of Mimir to Grafana Organisations
2. Migrate system metrics into giantswarm tenant
3. Align Multi-Tenancy of Alertmanager to Grafana Organisations
4. Migrate our alerts into giantswarm tenant

Outcome

• Customers can now be sure that all data that is stored within their tenant is completely isolated and secured.
• Customers only have access to the data that is relevant for them managed in their own tenant.