BTRFS metrics

[BreiteSeite]

Would it be possible to add a row for BTRFS metrics? They have some interesting, the important to me personally would be node_btrfs_device_errors_total.

Edit: i fiddled a bit around, but i'm not really familiar with queries and building dashboards, but maybe it's a starting point :

    {
      "collapsed": true,
      "gridPos": {
        "h": 1,
        "w": 24,
        "x": 0,
        "y": 10
      },
      "id": 324,
      "panels": [
        {
          "datasource": {
            "type": "prometheus",
            "uid": "${datasource}"
          },
          "description": "The device stats keep persistent record of several error classes related to doing IO. The current values are printed at mount time and updated during filesystem lifetime or from a scrub run.",
          "fieldConfig": {
            "defaults": {
              "color": {
                "mode": "palette-classic"
              },
              "custom": {
                "axisBorderShow": false,
                "axisCenteredZero": false,
                "axisColorMode": "text",
                "axisLabel": "",
                "axisPlacement": "auto",
                "barAlignment": 0,
                "barWidthFactor": 0.6,
                "drawStyle": "line",
                "fillOpacity": 0,
                "gradientMode": "none",
                "hideFrom": {
                  "legend": false,
                  "tooltip": false,
                  "viz": false
                },
                "insertNulls": false,
                "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"
                  },
                  {
                    "color": "red",
                    "value": 80
                  }
                ]
              }
            },
            "overrides": [
              {
                "__systemRef": "hideSeriesFrom",
                "matcher": {
                  "id": "byNames",
                  "options": {
                    "mode": "exclude",
                    "names": [
                      "sda - Flush I/O errors"
                    ],
                    "prefix": "All except:",
                    "readOnly": true
                  }
                },
                "properties": [
                  {
                    "id": "custom.hideFrom",
                    "value": {
                      "legend": false,
                      "tooltip": false,
                      "viz": true
                    }
                  }
                ]
              }
            ]
          },
          "gridPos": {
            "h": 8,
            "w": 12,
            "x": 0,
            "y": 11
          },
          "id": 325,
          "options": {
            "legend": {
              "calcs": [
                "mean",
                "lastNotNull",
                "max",
                "min"
              ],
              "displayMode": "table",
              "placement": "bottom",
              "showLegend": true
            },
            "tooltip": {
              "hideZeros": false,
              "mode": "single",
              "sort": "none"
            }
          },
          "pluginVersion": "11.6.0",
          "targets": [
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "disableTextWrap": false,
              "editorMode": "code",
              "exemplar": false,
              "expr": "irate(node_btrfs_device_errors_total{instance=\"$node\",job=\"$job\",type=\"write\"}[$__rate_interval])",
              "fullMetaSearch": false,
              "hide": false,
              "includeNullMetadata": true,
              "instant": false,
              "legendFormat": "{{device}} - Write I/O errors",
              "range": true,
              "refId": "B",
              "useBackend": false
            },
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "disableTextWrap": false,
              "editorMode": "code",
              "exemplar": false,
              "expr": "irate(node_btrfs_device_errors_total{instance=\"$node\",job=\"$job\",type=\"read\"}[$__rate_interval])",
              "fullMetaSearch": false,
              "hide": false,
              "includeNullMetadata": true,
              "instant": false,
              "legendFormat": "{{device}} - Read I/O errors",
              "range": true,
              "refId": "C",
              "useBackend": false
            },
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "disableTextWrap": false,
              "editorMode": "code",
              "exemplar": false,
              "expr": "irate(node_btrfs_device_errors_total{instance=\"$node\",job=\"$job\",type=\"flush\"}[$__rate_interval])",
              "fullMetaSearch": false,
              "hide": false,
              "includeNullMetadata": true,
              "instant": false,
              "legendFormat": "{{device}} - Flush I/O errors",
              "range": true,
              "refId": "D",
              "useBackend": false
            },
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "disableTextWrap": false,
              "editorMode": "code",
              "exemplar": false,
              "expr": "irate(node_btrfs_device_errors_total{instance=\"$node\",job=\"$job\",type=\"corruption\"}[$__rate_interval])",
              "fullMetaSearch": false,
              "includeNullMetadata": true,
              "instant": false,
              "legendFormat": "{{device}} - Corruption errors",
              "range": true,
              "refId": "A",
              "useBackend": false
            },
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "disableTextWrap": false,
              "editorMode": "code",
              "exemplar": false,
              "expr": "irate(node_btrfs_device_errors_total{instance=\"$node\",job=\"$job\",type=\"generation\"}[$__rate_interval])",
              "fullMetaSearch": false,
              "hide": false,
              "includeNullMetadata": true,
              "instant": false,
              "legendFormat": "{{device}} - Generation errors",
              "range": true,
              "refId": "E",
              "useBackend": false
            }
          ],
          "title": "Device Errors",
          "type": "timeseries"
        }
      ],
      "title": "BTRFS",
      "type": "row"
    },