K8S Control Plane
Metrics for API Server, Controller and Scheduler.
# Based on this very helpful blog 
https://blog.freshtracks.io/a-deep-dive-into-kubernetes-metrics-part-4-the-kubernetes-api-server-72f1e1210770

It contains below
1) Enable API Server Prometheus scraping
2) Assuming your prometheus scrapes based on service annotations, create services for Scheduler and Controller as outlined below

# Promethus Configuration for API Server
```
- job_name: kubernetes-apiservers
      scrape_interval: 10s
      scrape_timeout: 10s
      metrics_path: /metrics
      scheme: https
      kubernetes_sd_configs:
      - api_server: null
        role: endpoints
        namespaces:
          names: []
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        insecure_skip_verify: true
      relabel_configs:
      - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
        separator: ;
        regex: default;kubernetes;https
        replacement: $1
        action: keep
```

# Service for kube-scheduler
```---
apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
    prometheus.io/scrape_port: "10251"
  namespace: kube-system
  name: kube-scheduler-prometheus-discovery
  labels:
    component: kube-scheduler
spec:
  selector:
    component: kube-scheduler
  type: ClusterIP
  clusterIP: None
  ports:
  - name: http-metrics
    port: 10251
    targetPort: 10251
    protocol: TCP
```
# Service for kube-controller
```
apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
    prometheus.io/scrape_port: "10252"
  namespace: kube-system
  name: kube-controller-manager-prometheus-discovery
  labels:
    component: kube-controller-manager
spec:
  selector:
    component: kube-controller-manager
  type: ClusterIP
  clusterIP: None
  ports:
  - name: http-metrics
    port: 10252
    targetPort: 10252
    protocol: TCP
```


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            "mode": "time",
            "name": null,
            "show": true,
            "values": []
          },
          "yaxes": [
            {
              "format": "short",
              "label": null,
              "logBase": 1,
              "max": null,
              "min": null,
              "show": true
            },
            {
              "format": "short",
              "label": null,
              "logBase": 1,
              "max": null,
              "min": null,
              "show": true
            }
          ],
          "yaxis": {
            "align": false,
            "alignLevel": null
          }
        }
      ],
      "title": "API Server Details",
      "type": "row"
    }
  ],
  "refresh": false,
  "schemaVersion": 19,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": []
  },
  "time": {
    "from": "now-5m",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
      "5s",
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",
      "30m",
      "1h",
      "2h",
      "1d"
    ],
    "time_options": [
      "5m",
      "15m",
      "1h",
      "6h",
      "12h",
      "24h",
      "2d",
      "7d",
      "30d"
    ]
  },
  "timezone": "",
  "title": "K8S Control Plane",
  "uid": "U9zYC47Wz",
  "version": 35,
  "description": "Metrics for API Server, Controller and Scheduler."
}