{
  "dashboard": {
    "id": null,
    "title": "Loki 日志热点图 Demo",
    "tags": ["loki", "heatmap", "demo"],
    "style": "dark",
    "timezone": "browser",
    "panels": [
      {
        "id": 1,
        "title": "日志级别热点图 (类似GitHub贡献图)",
        "type": "heatmap",
        "targets": [
          {
            "datasource": {
              "type": "loki",
              "uid": "loki"
            },
            "expr": "sum by (level) (rate({job=\"systemd-journal\"}[5m]))",
            "refId": "A",
            "legendFormat": "{{level}}"
          }
        ],
        "fieldConfig": {
          "defaults": {
            "custom": {
              "hideFrom": {
                "legend": false,
                "tooltip": false,
                "vis": false
              },
              "scaleDistribution": {
                "type": "linear"
              }
            },
            "color": {
              "mode": "palette-classic"
            },
            "mappings": [],
            "thresholds": {
              "mode": "absolute",
              "steps": [
                {
                  "color": "green",
                  "value": null
                },
                {
                  "color": "yellow",
                  "value": 1
                },
                {
                  "color": "red",
                  "value": 10
                }
              ]
            }
          }
        },
        "gridPos": {
          "h": 8,
          "w": 12,
          "x": 0,
          "y": 0
        },
        "options": {
          "calculate": false,
          "cellGap": 2,
          "cellValues": {
            "unit": "short"
          },
          "color": {
            "exponent": 0.5,
            "fill": "dark-orange",
            "mode": "spectrum",
            "reverse": false,
            "scale": "exponential",
            "scheme": "Spectral",
            "steps": 64
          },
          "exemplars": {
            "color": "rgba(255,0,255,0.7)"
          },
          "filterValues": {
            "le": 1e-9
          },
          "legend": {
            "show": true
          },
          "rowsFrame": {
            "layout": "auto"
          },
          "tooltip": {
            "show": true,
            "yHistogram": false
          },
          "yAxis": {
            "axisPlacement": "left",
            "reverse": false,
            "unit": "short"
          }
        }
      },
      {
        "id": 2,
        "title": "节点日志密度热点图",
        "type": "heatmap",
        "targets": [
          {
            "datasource": {
              "type": "loki",
              "uid": "loki"
            },
            "expr": "sum by (hostname) (rate({job=\"systemd-journal\"}[5m]))",
            "refId": "A",
            "legendFormat": "{{hostname}}"
          }
        ],
        "fieldConfig": {
          "defaults": {
            "custom": {
              "hideFrom": {
                "legend": false,
                "tooltip": false,
                "vis": false
              }
            },
            "color": {
              "mode": "palette-classic"
            },
            "mappings": [],
            "thresholds": {
              "mode": "absolute",
              "steps": [
                {
                  "color": "green",
                  "value": null
                },
                {
                  "color": "yellow",
                  "value": 5
                },
                {
                  "color": "red",
                  "value": 20
                }
              ]
            }
          }
        },
        "gridPos": {
          "h": 8,
          "w": 12,
          "x": 12,
          "y": 0
        },
        "options": {
          "calculate": false,
          "cellGap": 2,
          "cellValues": {
            "unit": "short"
          },
          "color": {
            "exponent": 0.5,
            "fill": "dark-orange",
            "mode": "spectrum",
            "reverse": false,
            "scale": "exponential",
            "scheme": "Spectral",
            "steps": 64
          },
          "exemplars": {
            "color": "rgba(255,0,255,0.7)"
          },
          "filterValues": {
            "le": 1e-9
          },
          "legend": {
            "show": true
          },
          "rowsFrame": {
            "layout": "auto"
          },
          "tooltip": {
            "show": true,
            "yHistogram": false
          },
          "yAxis": {
            "axisPlacement": "left",
            "reverse": false,
            "unit": "short"
          }
        }
      },
      {
        "id": 3,
        "title": "关键服务日志热点图 (Nomad/Consul/Traefik)",
        "type": "heatmap",
        "targets": [
          {
            "datasource": {
              "type": "loki",
              "uid": "loki"
            },
            "expr": "sum by (unit) (rate({job=\"systemd-journal\", unit=~\"nomad|consul|traefik\"}[5m]))",
            "refId": "A",
            "legendFormat": "{{unit}}"
          }
        ],
        "fieldConfig": {
          "defaults": {
            "custom": {
              "hideFrom": {
                "legend": false,
                "tooltip": false,
                "vis": false
              }
            },
            "color": {
              "mode": "palette-classic"
            },
            "mappings": [],
            "thresholds": {
              "mode": "absolute",
              "steps": [
                {
                  "color": "green",
                  "value": null
                },
                {
                  "color": "yellow",
                  "value": 1
                },
                {
                  "color": "red",
                  "value": 5
                }
              ]
            }
          }
        },
        "gridPos": {
          "h": 8,
          "w": 24,
          "x": 0,
          "y": 8
        },
        "options": {
          "calculate": false,
          "cellGap": 2,
          "cellValues": {
            "unit": "short"
          },
          "color": {
            "exponent": 0.5,
            "fill": "dark-orange",
            "mode": "spectrum",
            "reverse": false,
            "scale": "exponential",
            "scheme": "Spectral",
            "steps": 64
          },
          "exemplars": {
            "color": "rgba(255,0,255,0.7)"
          },
          "filterValues": {
            "le": 1e-9
          },
          "legend": {
            "show": true
          },
          "rowsFrame": {
            "layout": "auto"
          },
          "tooltip": {
            "show": true,
            "yHistogram": false
          },
          "yAxis": {
            "axisPlacement": "left",
            "reverse": false,
            "unit": "short"
          }
        }
      },
      {
        "id": 4,
        "title": "ERROR/CRIT 级别日志热点图 (黑匣子重点)",
        "type": "heatmap",
        "targets": [
          {
            "datasource": {
              "type": "loki",
              "uid": "loki"
            },
            "expr": "sum by (hostname) (rate({job=\"systemd-journal\", level=~\"error|crit\"}[5m]))",
            "refId": "A",
            "legendFormat": "{{hostname}} - {{level}}"
          }
        ],
        "fieldConfig": {
          "defaults": {
            "custom": {
              "hideFrom": {
                "legend": false,
                "tooltip": false,
                "vis": false
              }
            },
            "color": {
              "mode": "palette-classic"
            },
            "mappings": [],
            "thresholds": {
              "mode": "absolute",
              "steps": [
                {
                  "color": "green",
                  "value": null
                },
                {
                  "color": "orange",
                  "value": 0.1
                },
                {
                  "color": "red",
                  "value": 1
                }
              ]
            }
          }
        },
        "gridPos": {
          "h": 8,
          "w": 24,
          "x": 0,
          "y": 16
        },
        "options": {
          "calculate": false,
          "cellGap": 2,
          "cellValues": {
            "unit": "short"
          },
          "color": {
            "exponent": 0.5,
            "fill": "dark-orange",
            "mode": "spectrum",
            "reverse": false,
            "scale": "exponential",
            "scheme": "Spectral",
            "steps": 64
          },
          "exemplars": {
            "color": "rgba(255,0,255,0.7)"
          },
          "filterValues": {
            "le": 1e-9
          },
          "legend": {
            "show": true
          },
          "rowsFrame": {
            "layout": "auto"
          },
          "tooltip": {
            "show": true,
            "yHistogram": false
          },
          "yAxis": {
            "axisPlacement": "left",
            "reverse": false,
            "unit": "short"
          }
        }
      }
    ],
    "time": {
      "from": "now-1h",
      "to": "now"
    },
    "timepicker": {},
    "templating": {
      "list": []
    },
    "annotations": {
      "list": []
    },
    "refresh": "30s",
    "schemaVersion": 27,
    "version": 1
  }
}