Small improvements for loki and node-exporter graph

[upodroid]

• add standard kubernetes labels
• add one metric used for node exporter dashboards

[CLAassistant]

All committers have signed the CLA.

[upodroid]

https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/

[upodroid]

https://github.com/prometheus-operator/kube-prometheus/blob/main/manifests/grafana-dashboardDefinitions.yaml#L17384

[upodroid]

#1296 had good pointers for how to combine LGTM stack + Alloy + kube-stack-prometheus dashboard/rules/alerts. It would be great to document that in the examples.

# helm upgrade --install k8s-monitoring grafana/k8s-monitoring -n observability -f values.yaml
# https://github.com/grafana/k8s-monitoring-helm/issues/1296

cluster:
  name: observability

global:
  scrapeInterval: 30s

destinations:
  - name: loki
    type: loki
    url: http://loki-gateway.observability.svc.cluster.local/loki/api/v1/push
  - name: mimir
    type: prometheus
    url: http://mimir-nginx.observability.svc.cluster.local/api/v1/push

clusterEvents:
  enabled: true

clusterMetrics:
  enabled: true
  apiServer:
    enabled: true
    jobLabel: apiserver
  kubelet:
    jobLabel: kubelet
    metricsTuning:
      # No filtering, keep all metrics
      useIntegrationAllowList: false
    extraMetricProcessingRules: |
      rule {
        replacement   = "/metrics"
        target_label  = "metrics_path"
      }
    scrapeInterval: 10s
  kubeletResource:
    jobLabel: kubelet
    metricsTuning:
      # No filtering, keep all metrics
      useIntegrationAllowList: false
    scrapeInterval: 10s
  cadvisor:
    jobLabel: kubelet
    metricsTuning:
      # No filtering, keep all metrics
      useIntegrationAllowList: false
    extraMetricProcessingRules: |
      rule {
        replacement   = "/metrics/cadvisor"
        target_label  = "metrics_path"
      }
    scrapeInterval: 10s
  node-exporter:
    jobLabel: node-exporter
    metricsTuning:
      # No filtering, keep all metrics
      useDefaultAllowList: false
  kube-state-metrics:
    jobLabel: kube-state-metrics
    metricsTuning:
      # No filtering, keep all metrics
      useDefaultAllowList: false
    metricLabelsAllowlist:
      - pods=[*]
      - deployments=[*]
  windows-exporter:
    deploy: false
    enabled: false

prometheusOperatorObjects:
  enabled: true
  crds:
    deploy: true
podLogs:
  enabled: true
nodeLogs:
  enabled: true
alloy-metrics:
  enabled: true
  liveDebugging:
    enabled: true
  # https://github.com/grafana/k8s-monitoring-helm/issues/1073
  extraConfig: |
    mimir.rules.kubernetes "default" {
      address = "http://mimir-ruler.observability.svc:8080"
      tenant_id = "anonymous"
    }
alloy-logs:
  enabled: true
  liveDebugging:
    enabled: true
alloy-singleton:
  enabled: true