[kube-monitoring] Integration of own default rules

[richardtief]

Context

kube-monitoring is shipped with a standard set of alerting rules from the kubernetes-mixin project, which have a very high formal quality but are also very generic. In addition, there is a proven set of alerting rules from SAP Converged Cloud [1], which is more action-oriented and causes less noise. To get the best out of both sets of rules, active review is required.

Tasks

1. Disable the default Kubernetes rules from the release
2. Integrate the kubernetes-operations rules
3. Test and validation of rules and underlying metrics
4. Documentation

[richardtief]

The renaming of the repo https://github.com/cloudoperators/kubernetes-operations led to a new ospo process in order to publish it properly as open source. This process has not yet been completed, which led to the postponement.