Spegel stateless cluster local OCI registry mirror
Spegel is a pull only OCI registry which runs locally on every Node in the Kubernetes cluster. Containerd is configured to use the local registry as a mirror, which would serve the image from within the cluster or from the source registry.
Spegel and Kubelet metrics
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        },
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          "mode": "single",
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      },
      "targets": [
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${DS_PROMETHEUS}"
          },
          "editorMode": "code",
          "expr": "sum(rate(kubelet_runtime_operations_total{job=\"kubelet\", metrics_path=\"/metrics\", operation_type=~\"list_images|pull_image|start_container|list_images|list_containers|version|exec_sync|create_container\"}[$__rate_interval])) by (operation_type)",
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          "refId": "A"
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      ],
      "title": "Kubelet Operation Rate",
      "transparent": true,
      "type": "timeseries"
    },
    {
      "datasource": {
        "type": "prometheus",
        "uid": "$datasource"
      },
      "fieldConfig": {
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          "color": {
            "mode": "palette-classic"
          },
          "custom": {
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            "axisColorMode": "text",
            "axisLabel": "",
            "axisPlacement": "auto",
            "barAlignment": 0,
            "drawStyle": "line",
            "fillOpacity": 10,
            "gradientMode": "none",
            "hideFrom": {
              "legend": false,
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            },
            "lineInterpolation": "linear",
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            "pointSize": 5,
            "scaleDistribution": {
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            },
            "showPoints": "never",
            "spanNulls": false,
            "stacking": {
              "group": "A",
              "mode": "none"
            },
            "thresholdsStyle": {
              "mode": "off"
            }
          },
          "mappings": [],
          "thresholds": {
            "mode": "absolute",
            "steps": [
              {
                "color": "green",
                "value": null
              },
              {
                "color": "red",
                "value": 80
              }
            ]
          },
          "unit": "ops"
        },
        "overrides": []
      },
      "gridPos": {
        "h": 10,
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        "x": 12,
        "y": 21
      },
      "id": 33,
      "links": [],
      "options": {
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          "calcs": [],
          "displayMode": "list",
          "placement": "bottom",
          "showLegend": true
        },
        "tooltip": {
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      },
      "pluginVersion": "9.3.6",
      "targets": [
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          "datasource": {
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          },
          "editorMode": "code",
          "expr": "sum(rate(kubelet_runtime_operations_errors_total{job=\"kubelet\", metrics_path=\"/metrics\",operation_type=~\"list_images|pull_image|start_container|list_images|list_containers|version|exec_sync|create_container\"}[$__rate_interval])) by (operation_type)",
          "format": "time_series",
          "intervalFactor": 2,
          "legendFormat": "{{instance}} {{operation_type}}",
          "range": true,
          "refId": "A"
        }
      ],
      "title": "Kubelet Operation Error Rate",
      "transparent": true,
      "type": "timeseries"
    }
  ],
  "refresh": "30s",
  "schemaVersion": 37,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": [
      {
        "current": {
          "selected": false,
          "text": "Prometheus",
          "value": "Prometheus"
        },
        "hide": 0,
        "includeAll": false,
        "label": "Data Source",
        "multi": false,
        "name": "datasource",
        "options": [],
        "query": "prometheus",
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "type": "datasource"
      },
      {
        "current": {
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          "text": "registry",
          "value": "registry"
        },
        "description": "",
        "hide": 2,
        "includeAll": false,
        "label": "container",
        "multi": false,
        "name": "container",
        "options": [
          {
            "selected": true,
            "text": "registry",
            "value": "registry"
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        ],
        "query": "registry",
        "queryValue": "",
        "skipUrlSync": false,
        "type": "custom"
      },
      {
        "current": {},
        "datasource": {
          "type": "prometheus",
          "uid": "${DS_PROMETHEUS}"
        },
        "definition": "label_values(spegel_advertised_images,pod)",
        "description": "",
        "hide": 2,
        "includeAll": false,
        "label": "pod",
        "multi": false,
        "name": "pod",
        "options": [],
        "query": {
          "query": "label_values(spegel_advertised_images,pod)",
          "refId": "StandardVariableQuery"
        },
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "type": "query"
      },
      {
        "current": {},
        "datasource": {
          "type": "prometheus",
          "uid": "${DS_PROMETHEUS}"
        },
        "definition": "label_values(spegel_advertised_keys,instance) ",
        "hide": 0,
        "includeAll": true,
        "label": "instance",
        "multi": true,
        "name": "instance",
        "options": [],
        "query": {
          "query": "label_values(spegel_advertised_keys,instance) ",
          "refId": "StandardVariableQuery"
        },
        "refresh": 2,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "type": "query"
      }
    ]
  },
  "time": {
    "from": "now-3h",
    "to": "now"
  },
  "timepicker": {},
  "timezone": "",
  "title": "Spegel stateless cluster local OCI registry mirror",
  "uid": "1iY4QMJVk-psee",
  "version": 1,
  "weekStart": "",
  "gnetId": 18089,
  "description": "Spegel is a pull only OCI registry which runs locally on every Node in the Kubernetes cluster. Containerd is configured to use the local registry as a mirror, which would serve the image from within the cluster or from the source registry."
}