Deploy monitoring in mini-lab

[ostempel]

Description

Depends on:

• Adaptions for running monitoring in the mini-lab metal-roles#502

Add monitoring roles to mini-lab.

Setup:

• expose ports of grafana, loki and prometheus
• make control plane ip configurable
• change metal-api replicas because of alert-rule
• increase RAM of switches

Prometheus:

• add remote write
• add leaves to /etc/hosts

Monitoring:

• setup node-exporter
• setup blackbox-exporter
• setup sonic-exporter
• setup ipmi-exporter
• setup blackbox-exporter

Sonic:

• add ntp servers
• mock platform data for sonic-exporter

Promtail:

• scrape docker containers

[Gerrit91]

Looks very straight-forward and very valuable. :)

[Gerrit91]

For resolving merge conflicts with main: https://github.com/metal-stack/metal-roles/tree/master/partition/roles/sonic-config#migration-from-the-deprecated-sonic-role

[Gerrit91]

Merging despite failing pipeline. It's not related to this PR. See #279.