Grafana dashboard: OpenTelemetry Kubernetes Nodes Hostmetrics
Description: Monitors kubernetes nodes using metrics scraped by Otel's Host Metrics receiver and Otel's Kubernetes cluster receiver

This dashboard shows important information from pods running in a kubernetes cluster. It relies on metrics collected using [Otel's Kubelet Stats receiver](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/receiver/kubeletstatsreceiver/README.md) and [Otel's Kubernetes cluster receiver](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/receiver/k8sclusterreceiver). The following snippet shows an [OpenTelemetry collector's](https://opentelemetry.io/docs/collector/) configuration that should scrape the metrics required by this dashboard:

```
receivers:
  hostmetrics:
    collection_interval: 10s
    root_path: /hostfs
    scrapers:
      cpu:
        metrics:
          system.cpu.utilization:
            enabled: true
      disk: null
      filesystem:
        exclude_fs_types:
          fs_types:
          - autofs
          - binfmt_misc
          - bpf
          - cgroup2
          - configfs
          - debugfs
          - devpts
          - devtmpfs
          - fusectl
          - hugetlbfs
          - iso9660
          - mqueue
          - nsfs
          - overlay
          - proc
          - procfs
          - pstore
          - rpc_pipefs
          - securityfs
          - selinuxfs
          - squashfs
          - sysfs
          - tracefs
          match_type: strict
        exclude_mount_points:
          match_type: regexp
          mount_points:
          - /dev/*
          - /proc/*
          - /sys/*
          - /run/k3s/containerd/*
          - /var/lib/docker/*
          - /var/lib/kubelet/*
          - /snap/*
        metrics:
          system.filesystem.utilization:
            enabled: true
      load: null
      memory:
        metrics:
          system.memory.utilization:
            enabled: true
      network: null
  k8s_cluster:
    allocatable_types_to_report:
    - cpu
    - memory
    - storage
    - ephemeral-storage
    collection_interval: 15s
    node_conditions_to_report:
    - Ready
    - MemoryPressure
processors:
  resourcedetection/env:
    detectors:
    - env
  resource/remove_pod_name:
    attributes:
    - action: delete
      key: k8s.pod.name
    - action: delete
      key: k8s_pod_name
  resource/remove_container_id:
    attributes:
    - action: delete
      key: container.id
    - action: delete
      key: container_id
exporters:
  prometheusremotewrite/local:
    endpoint: http://prometheus-server/api/v1/write
    resource_to_telemetry_conversion:
      enabled: true
service:
  extensions:
  - health_check
  - memory_ballast
  pipelines
    metrics/hostmetrics:
      exporters:
      - prometheusremotewrite/local
      processors:
      - resourcedetection/env
      - resource/remove_pod_name
      receivers:
      - hostmetrics
    metrics/k8s_cluster:
      exporters:
      - prometheusremotewrite/local
      processors:
      - resource/remove_container_id
      receivers:
      - k8s_cluster

```

A few things from that config snippet should be explained further:

* *container_id* label is removed from metrics (metrics/k8s_cluster pipeline). The biggest reason why this is done is because, when containers get restarted, they will create a new time series (because container_id labe is different). This demands more resources from prometheus and would break some panels (like rate(containers_restart))
* *prometheusremotewrite* exporter enables *resource_to_telemetry_conversion* is required to export existing attributes as prometheus labels.
* *k8s_pod_name label* is removed from the *metrics/hostmetrics* pipeline because, if the otel pod from a node (this was deployed using a daemonset) is recreated (for example, when updating otel's helm chart) a new time series would be created for the same node
* [Resource Detection processor](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/processor/resourcedetectionprocessor) is used with env vars [sample setup can be found here](https://gitlab.com/sergiojvg/home-media/-/blob/main/terraform/monitoring/otel.tf#L206) to add required attributes to hostmetrics resources (that will later on be translated into prometheus labels).

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          "datasource": {
            "type": "prometheus",
            "uid": "${DS_PROMETHEUS}"
          },
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              },
              "custom": {
                "axisCenteredZero": false,
                "axisColorMode": "text",
                "axisLabel": "",
                "axisPlacement": "left",
                "barAlignment": 0,
                "drawStyle": "line",
                "fillOpacity": 0,
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                "hideFrom": {
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                },
                "lineInterpolation": "linear",
                "lineWidth": 1,
                "pointSize": 5,
                "scaleDistribution": {
                  "type": "linear"
                },
                "showPoints": "auto",
                "spanNulls": false,
                "stacking": {
                  "group": "A",
                  "mode": "none"
                },
                "thresholdsStyle": {
                  "mode": "off"
                }
              },
              "mappings": [],
              "thresholds": {
                "mode": "absolute",
                "steps": [
                  {
                    "color": "green",
                    "value": null
                  },
                  {
                    "color": "red",
                    "value": 80
                  }
                ]
              }
            },
            "overrides": [
              {
                "matcher": {
                  "id": "byRegexp",
                  "options": ".*Memory"
                },
                "properties": [
                  {
                    "id": "custom.axisPlacement",
                    "value": "right"
                  },
                  {
                    "id": "unit",
                    "value": "bytes"
                  }
                ]
              },
              {
                "matcher": {
                  "id": "byRegexp",
                  "options": ".*CPU"
                },
                "properties": [
                  {
                    "id": "custom.axisPlacement",
                    "value": "left"
                  }
                ]
              }
            ]
          },
          "gridPos": {
            "h": 8,
            "w": 12,
            "x": 12,
            "y": 21
          },
          "id": 14,
          "options": {
            "legend": {
              "calcs": [],
              "displayMode": "list",
              "placement": "bottom",
              "showLegend": true
            },
            "tooltip": {
              "mode": "single",
              "sort": "none"
            }
          },
          "pluginVersion": "9.4.3",
          "targets": [
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${DS_PROMETHEUS}"
              },
              "editorMode": "code",
              "expr": "k8s_node_memory_available_bytes{k8s_node_name=\"$instance\"}",
              "hide": false,
              "legendFormat": "{{ k8s_node_name }} Allocatable Memory",
              "range": true,
              "refId": "B"
            }
          ],
          "title": "Allocatable resources (available)",
          "type": "timeseries"
        }
      ],
      "title": "Kubernetes - allocatable",
      "type": "row"
    }
  ],
  "refresh": "",
  "revision": 1,
  "schemaVersion": 38,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": [
      {
        "current": {},
        "datasource": {
          "type": "prometheus",
          "uid": "${DS_PROMETHEUS}"
        },
        "definition": "label_values(instance)",
        "hide": 0,
        "includeAll": false,
        "multi": false,
        "name": "instance",
        "options": [],
        "query": {
          "query": "label_values(instance)",
          "refId": "StandardVariableQuery"
        },
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "type": "query"
      }
    ]
  },
  "time": {
    "from": "now-15m",
    "to": "now"
  },
  "timepicker": {},
  "timezone": "",
  "title": "OpenTelemetry Kubernetes Nodes Hostmetrics",
  "uid": "OiEkUDsVk",
  "version": 4,
  "weekStart": "",
  "gnetId": 18682,
  "description": "Monitors kubernetes nodes using metrics scraped by Otel's Host Metrics receiver and Otel's Kubernetes cluster receiver"
}