feat: Added stfuff

nixos/mirai/services/grafana/README.md

@@ -2,9 +2,23 @@
 
 This directory contains Grafana dashboards configured to monitor multiple NixOS devices: `mirai`, `tsuba`, and `ryu`.
 
-## Dashboard Overview
+## Homepage Dashboard
 
-### 1. Multi-Device System Metrics (`multi-device-system-dashboard.json`)
+When you access Grafana at `grafana.darksailor.dev`, you'll be greeted with the **Monitoring Hub Homepage** that provides:
+
+- **Device Status Overview**: Real-time status table showing CPU, memory, disk usage, and uptime for all devices
+- **Dashboard Navigation**: Color-coded tiles linking to all monitoring dashboards
+- **Quick Actions**: Direct links to Prometheus targets, dashboard management, and documentation
+- **Organized Layout**: Dashboards are grouped by category for easy navigation
+
+## Dashboard Organization
+
+Dashboards are organized into folders for better management:
+
+### **📊 Multi-Device Monitoring**
+Located in `multi-device/` folder:
+
+#### 1. Multi-Device System Metrics
 - **Purpose**: Compare system metrics across all devices on a single dashboard
 - **Features**:
   - Device filtering via template variable (can select one, multiple, or all devices)
@@ -16,17 +30,7 @@ This directory contains Grafana dashboards configured to monitor multiple NixOS
   - System uptime tracking
   - Load average trends
 
-### 2. Device-Specific System Dashboard (`device-specific-system-dashboard.json`)
-- **Purpose**: Detailed system monitoring for a single selected device
-- **Features**:
-  - Device selection via template variable
-  - Detailed CPU, memory, and disk metrics
-  - Network and disk I/O operations
-  - System status indicators
-  - Load average trends (1m, 5m, 15m)
-  - Enhanced visualizations with thresholds and color coding
-
-### 3. Multi-Device Process Monitoring (`multi-device-processes-dashboard.json`)
+#### 2. Multi-Device Process Monitoring
 - **Purpose**: Monitor processes across all devices
 - **Features**:
   - Device filtering for process metrics
@@ -36,7 +40,21 @@ This directory contains Grafana dashboards configured to monitor multiple NixOS
   - Process I/O throughput monitoring
   - Process count tracking per device
 
-### 4. Legacy Dashboards
+### **🔍 Device-Specific**
+Located in `device-specific/` folder:
+
+#### Device-Specific System Dashboard
+- **Purpose**: Detailed system monitoring for a single selected device
+- **Features**:
+  - Device selection via template variable
+  - Detailed CPU, memory, and disk metrics
+  - Network and disk I/O operations
+  - System status indicators
+  - Load average trends (1m, 5m, 15m)
+  - Enhanced visualizations with thresholds and color coding
+
+### **📚 Legacy Dashboards**
+Located in `legacy/` folder:
 - `system-dashboard.json`: Original single-device system dashboard
 - `processes-dashboard.json`: Original single-device process dashboard
 
@@ -76,13 +94,20 @@ All multi-device dashboards include a `$device` template variable that allows:
 
 The variable automatically populates with available devices based on Prometheus metrics.
 
-## Usage Tips
+## Usage Guide
 
-1. **Quick Overview**: Start with the multi-device system dashboard to get an overview of all devices
-2. **Detailed Analysis**: Use device-specific dashboards for in-depth analysis of a particular device
-3. **Process Monitoring**: Use the multi-device process dashboard to track resource-intensive processes across devices
-4. **Filtering**: Use the device template variable to focus on specific devices of interest
+### Getting Started
+1. **Homepage First**: Visit `grafana.darksailor.dev` to see the homepage with device overview
+2. **Dashboard Navigation**: Click on the colored tiles to access different dashboard categories
+3. **Quick Status Check**: Use the device status table on the homepage for immediate health overview
+
+### Dashboard Navigation Tips
+1. **Multi-Device Comparison**: Start with multi-device dashboards to compare all systems
+2. **Deep Dive Analysis**: Use device-specific dashboards for detailed single-device monitoring
+3. **Process Troubleshooting**: Use multi-device process dashboard to identify resource issues
+4. **Template Variables**: Use the device dropdown to filter by specific devices
 5. **Time Ranges**: Adjust time ranges based on your monitoring needs (default: last 1 hour)
+6. **Folder Organization**: Browse dashboards by category using the folder structure
 
 ## Customization
 
@@ -114,4 +139,25 @@ All dashboard queries use the `device=~"$device"` filter to support multi-device
 ### Performance
 - Limit the number of devices selected simultaneously for better performance
 - Adjust refresh rates if dashboards become slow
-- Consider shorter time ranges for detailed analysis
+- Consider shorter time ranges for detailed analysis
+
+## Homepage Features
+
+### Device Status Table
+- Real-time overview of all monitored devices
+- Color-coded status indicators (UP/DOWN)
+- CPU, memory, and disk usage percentages
+- System uptime tracking
+- Automatically updates every 30 seconds
+
+### Dashboard Categories
+- **Blue**: Multi-Device System monitoring
+- **Green**: Device-Specific detailed monitoring  
+- **Purple**: Multi-Device Process monitoring
+- **Orange**: Legacy single-device dashboards
+
+### Quick Actions
+- **Prometheus Targets**: Direct link to check scrape target health
+- **Dashboard Management**: Access to Grafana's dashboard browser
+- **Data Sources**: Manage Prometheus and other data sources
+- **Documentation**: Link to setup and usage documentation

nixos/mirai/services/grafana/STRUCTURE.md

@@ -0,0 +1,161 @@
+# Grafana Dashboard Structure
+
+## Directory Layout
+
+```
+dotfiles/nixos/mirai/services/grafana/
+├── README.md                           # Main documentation
+├── STRUCTURE.md                        # This file - structure overview
+├── homepage/
+│   └── homepage-dashboard.json         # Main homepage dashboard
+├── multi-device/
+│   ├── multi-device-system-dashboard.json     # System metrics across devices
+│   └── multi-device-processes-dashboard.json  # Process monitoring across devices
+├── device-specific/
+│   └── device-specific-system-dashboard.json  # Single device detailed view
+└── legacy/
+    ├── system-dashboard.json           # Original system dashboard
+    └── processes-dashboard.json        # Original process dashboard
+```
+
+## Dashboard Hierarchy
+
+```
+🏠 Homepage (monitoring-homepage)
+├── Device Status Overview Table
+├── Quick Dashboard Links
+└── Action Buttons
+    │
+    ├── 📊 Multi-Device Monitoring/
+    │   ├── Multi-Device System (multi-device-system)
+    │   └── Multi-Device Processes (multi-device-processes)
+    │
+    ├── 🔍 Device-Specific/
+    │   └── Device System Dashboard (device-system-${device})
+    │
+    └── 📚 Legacy Dashboards/
+        ├── Legacy System (system-metrics)
+        └── Legacy Processes (process-metrics)
+```
+
+## Dashboard Features Matrix
+
+| Dashboard | Device Filter | Comparison | Time Series | Status | Process Data |
+|-----------|--------------|------------|-------------|---------|--------------|
+| Homepage | ❌ | ✅ | ❌ | ✅ | ❌ |
+| Multi-Device System | ✅ | ✅ | ✅ | ✅ | ❌ |
+| Multi-Device Processes | ✅ | ✅ | ✅ | ❌ | ✅ |
+| Device-Specific | ✅ | ❌ | ✅ | ✅ | ❌ |
+| Legacy System | ❌ | ❌ | ✅ | ✅ | ❌ |
+| Legacy Processes | ❌ | ❌ | ✅ | ❌ | ✅ |
+
+## User Journey Flow
+
+```
+1. User visits grafana.darksailor.dev
+   ↓
+2. Homepage loads automatically
+   ↓
+3. User sees device status overview
+   ↓
+4. User clicks dashboard tile based on need:
+   │
+   ├── Multi-Device System → Compare all devices
+   ├── Device-Specific → Deep dive single device
+   ├── Multi-Device Processes → Process monitoring
+   └── Legacy → Original dashboards
+   ↓
+5. User uses template variables to filter data
+   ↓
+6. User navigates between dashboards using links
+```
+
+## Configuration Mapping
+
+| Grafana Folder | File Path | Provision Path |
+|----------------|-----------|----------------|
+| Root | `homepage/` | `/etc/grafana/dashboards/homepage/` |
+| Multi-Device Monitoring | `multi-device/` | `/etc/grafana/dashboards/multi-device/` |
+| Device-Specific | `device-specific/` | `/etc/grafana/dashboards/device-specific/` |
+| Legacy Dashboards | `legacy/` | `/etc/grafana/dashboards/legacy/` |
+
+## Metrics Coverage
+
+### System Metrics (Node Exporter - Port 9100)
+- ✅ CPU usage and load average
+- ✅ Memory utilization (used/total)
+- ✅ Disk usage and I/O operations
+- ✅ Network interface statistics
+- ✅ SystemD service status
+- ✅ System uptime and boot time
+
+### Process Metrics (Process Exporter - Port 9256)
+- ✅ CPU usage per process group
+- ✅ Memory usage (resident/virtual)
+- ✅ Process I/O operations (read/write)
+- ✅ Process count and lifecycle
+- ✅ Process resource trends
+
+## Device Labels
+
+| Device | Type | Architecture | Services |
+|--------|------|--------------|----------|
+| mirai | server | x86_64 | Grafana, Prometheus, Caddy |
+| tsuba | server | aarch64 | Media services, NAS |
+| ryu | desktop | x86_64 | Gaming, Development |
+
+## Color Coding
+
+### Dashboard Categories
+- 🔵 **Blue**: Multi-Device System monitoring
+- 🟢 **Green**: Device-Specific detailed monitoring
+- 🟣 **Purple**: Multi-Device Process monitoring
+- 🟠 **Orange**: Legacy single-device dashboards
+
+### Status Indicators
+- 🟢 **Green**: Service UP / Normal operation
+- 🔴 **Red**: Service DOWN / Critical threshold
+- 🟡 **Yellow**: Warning threshold
+- 🔵 **Blue**: Information / Navigation
+
+## Dashboard UIDs Reference
+
+| Dashboard | UID | URL Path |
+|-----------|-----|----------|
+| Homepage | `monitoring-homepage` | `d/monitoring-homepage` |
+| Multi-Device System | `multi-device-system` | `d/multi-device-system` |
+| Multi-Device Processes | `multi-device-processes` | `d/multi-device-processes` |
+| Device-Specific | `device-system-${device}` | `d/device-system-mirai` |
+| Legacy System | `system-metrics` | `d/system-metrics` |
+| Legacy Processes | `process-metrics` | `d/process-metrics` |
+
+## Refresh Rates
+
+- Homepage: 30 seconds
+- Multi-Device dashboards: 30 seconds
+- Device-Specific: 30 seconds  
+- Legacy dashboards: 30 seconds
+
+## Template Variables
+
+### Device Selection ($device)
+- **Type**: Query variable
+- **Query**: `label_values(up, device)`
+- **Multi-select**: Yes (for multi-device dashboards)
+- **Include All**: Yes
+- **Current Values**: mirai, tsuba, ryu
+
+## Quick Access URLs
+
+- Homepage: `https://grafana.darksailor.dev/d/monitoring-homepage`
+- Multi-Device System: `https://grafana.darksailor.dev/d/multi-device-system`
+- Prometheus Targets: `https://prometheus.darksailor.dev/targets`
+- Dashboard Browser: `https://grafana.darksailor.dev/dashboards`
+
+## Maintenance Notes
+
+- Dashboards auto-update from provisioned files
+- New devices appear automatically when exporters are configured
+- Template variables refresh every page load
+- Dashboard folders are recreated on Grafana restart
+- Homepage is set as default landing page for all users

nixos/mirai/services/grafana/homepage/homepage-dashboard.json

@@ -0,0 +1,956 @@
+{
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": {
+          "type": "grafana",
+          "uid": "-- Grafana --"
+        },
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "fiscalYearStartMonth": 0,
+  "graphTooltip": 0,
+  "id": null,
+  "links": [],
+  "liveNow": false,
+  "panels": [
+    {
+      "collapsed": false,
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "id": 1000,
+      "panels": [],
+      "title": "Infrastructure Monitoring Overview",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "align": "center",
+            "cellOptions": {
+              "type": "color-background"
+            },
+            "inspect": false
+          },
+          "mappings": [
+            {
+              "options": {
+                "0": {
+                  "color": "red",
+                  "index": 1,
+                  "text": "DOWN"
+                },
+                "1": {
+                  "color": "green",
+                  "index": 0,
+                  "text": "UP"
+                }
+              },
+              "type": "value"
+            }
+          ],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "red",
+                "value": null
+              },
+              {
+                "color": "green",
+                "value": 1
+              }
+            ]
+          }
+        },
+        "overrides": [
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "CPU %"
+            },
+            "properties": [
+              {
+                "id": "unit",
+                "value": "percent"
+              },
+              {
+                "id": "max",
+                "value": 100
+              },
+              {
+                "id": "min",
+                "value": 0
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "Memory %"
+            },
+            "properties": [
+              {
+                "id": "unit",
+                "value": "percent"
+              },
+              {
+                "id": "max",
+                "value": 100
+              },
+              {
+                "id": "min",
+                "value": 0
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "Disk %"
+            },
+            "properties": [
+              {
+                "id": "unit",
+                "value": "percent"
+              },
+              {
+                "id": "max",
+                "value": 100
+              },
+              {
+                "id": "min",
+                "value": 0
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "Uptime"
+            },
+            "properties": [
+              {
+                "id": "unit",
+                "value": "s"
+              }
+            ]
+          }
+        ]
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 24,
+        "x": 0,
+        "y": 1
+      },
+      "id": 1,
+      "options": {
+        "cellHeight": "lg",
+        "footer": {
+          "countRows": false,
+          "fields": "",
+          "reducer": ["sum"],
+          "show": false
+        },
+        "showHeader": true
+      },
+      "pluginVersion": "8.0.0",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "prometheus"
+          },
+          "expr": "up{job=\"node\"}",
+          "format": "table",
+          "instant": true,
+          "intervalFactor": 1,
+          "legendFormat": "",
+          "refId": "A"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "prometheus"
+          },
+          "expr": "100 - (avg by (device) (irate(node_cpu_seconds_total{mode=\"idle\"}[5m])) * 100)",
+          "format": "table",
+          "instant": true,
+          "intervalFactor": 1,
+          "legendFormat": "",
+          "refId": "B"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "prometheus"
+          },
+          "expr": "((node_memory_MemTotal_bytes - node_memory_MemFree_bytes - node_memory_Buffers_bytes - node_memory_Cached_bytes) / node_memory_MemTotal_bytes) * 100",
+          "format": "table",
+          "instant": true,
+          "intervalFactor": 1,
+          "legendFormat": "",
+          "refId": "C"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "prometheus"
+          },
+          "expr": "100 - ((node_filesystem_avail_bytes{mountpoint=\"/\",fstype!=\"tmpfs\"} * 100) / node_filesystem_size_bytes{mountpoint=\"/\",fstype!=\"tmpfs\"})",
+          "format": "table",
+          "instant": true,
+          "intervalFactor": 1,
+          "legendFormat": "",
+          "refId": "D"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "prometheus"
+          },
+          "expr": "time() - node_boot_time_seconds",
+          "format": "table",
+          "instant": true,
+          "intervalFactor": 1,
+          "legendFormat": "",
+          "refId": "E"
+        }
+      ],
+      "title": "Device Status Overview",
+      "transformations": [
+        {
+          "id": "merge",
+          "options": {}
+        },
+        {
+          "id": "organize",
+          "options": {
+            "excludeByName": {
+              "Time": true,
+              "__name__": true,
+              "instance": true,
+              "job": true,
+              "fstype": true,
+              "mountpoint": true,
+              "mode": true
+            },
+            "indexByName": {},
+            "renameByName": {
+              "Value #A": "Status",
+              "Value #B": "CPU %",
+              "Value #C": "Memory %",
+              "Value #D": "Disk %",
+              "Value #E": "Uptime",
+              "device": "Device"
+            }
+          }
+        }
+      ],
+      "type": "table"
+    },
+    {
+      "collapsed": false,
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 9
+      },
+      "id": 1001,
+      "panels": [],
+      "title": "System Monitoring Dashboards",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "testdata",
+        "uid": "PD8C576611E62080A"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "align": "center",
+            "cellOptions": {
+              "type": "color-background"
+            },
+            "inspect": false
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 8,
+        "x": 0,
+        "y": 10
+      },
+      "id": 2,
+      "options": {
+        "cellHeight": "lg",
+        "footer": {
+          "countRows": false,
+          "fields": "",
+          "reducer": ["sum"],
+          "show": false
+        },
+        "showHeader": false
+      },
+      "pluginVersion": "8.0.0",
+      "targets": [
+        {
+          "datasource": {
+            "type": "testdata",
+            "uid": "PD8C576611E62080A"
+          },
+          "refId": "A",
+          "scenarioId": "csv_content",
+          "stringInput": "Dashboard,Description\nMulti-Device System,\"Compare CPU, memory, disk & network across all devices\""
+        }
+      ],
+      "title": "",
+      "transformations": [],
+      "type": "table",
+      "links": [
+        {
+          "title": "Open Multi-Device System Dashboard",
+          "url": "d/multi-device-system"
+        }
+      ]
+    },
+    {
+      "datasource": {
+        "type": "testdata",
+        "uid": "PD8C576611E62080A"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "align": "center",
+            "cellOptions": {
+              "type": "color-background"
+            },
+            "inspect": false
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 8,
+        "x": 8,
+        "y": 10
+      },
+      "id": 3,
+      "options": {
+        "cellHeight": "lg",
+        "footer": {
+          "countRows": false,
+          "fields": "",
+          "reducer": ["sum"],
+          "show": false
+        },
+        "showHeader": false
+      },
+      "pluginVersion": "8.0.0",
+      "targets": [
+        {
+          "datasource": {
+            "type": "testdata",
+            "uid": "PD8C576611E62080A"
+          },
+          "refId": "A",
+          "scenarioId": "csv_content",
+          "stringInput": "Dashboard,Description\nDevice-Specific System,\"Detailed monitoring for individual devices with enhanced visualizations\""
+        }
+      ],
+      "title": "",
+      "transformations": [],
+      "type": "table",
+      "links": [
+        {
+          "title": "Open Device-Specific Dashboard",
+          "url": "d/device-system-${device}"
+        }
+      ]
+    },
+    {
+      "datasource": {
+        "type": "testdata",
+        "uid": "PD8C576611E62080A"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "align": "center",
+            "cellOptions": {
+              "type": "color-background"
+            },
+            "inspect": false
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "purple",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 8,
+        "x": 16,
+        "y": 10
+      },
+      "id": 4,
+      "options": {
+        "cellHeight": "lg",
+        "footer": {
+          "countRows": false,
+          "fields": "",
+          "reducer": ["sum"],
+          "show": false
+        },
+        "showHeader": false
+      },
+      "pluginVersion": "8.0.0",
+      "targets": [
+        {
+          "datasource": {
+            "type": "testdata",
+            "uid": "PD8C576611E62080A"
+          },
+          "refId": "A",
+          "scenarioId": "csv_content",
+          "stringInput": "Dashboard,Description\nMulti-Device Processes,\"Monitor processes across all devices with resource usage tracking\""
+        }
+      ],
+      "title": "",
+      "transformations": [],
+      "type": "table",
+      "links": [
+        {
+          "title": "Open Multi-Device Process Dashboard",
+          "url": "d/multi-device-processes"
+        }
+      ]
+    },
+    {
+      "collapsed": false,
+      "gridPos": {
+        "h": 1,
+        "w": 24,
+        "x": 0,
+        "y": 14
+      },
+      "id": 1002,
+      "panels": [],
+      "title": "Legacy Dashboards",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "testdata",
+        "uid": "PD8C576611E62080A"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "align": "center",
+            "cellOptions": {
+              "type": "color-background"
+            },
+            "inspect": false
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "orange",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
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