From e9321297c057c6954740f4cd8cbe1efec8ef425c Mon Sep 17 00:00:00 2001
From: atlas <atlas@hyperhive.local>
Date: Sun, 8 Nov 2026 02:29:16 +0100
Subject: [PATCH] swarm-grafana: a host dashboard for the collector's system
 metrics

Adds host.json (hive and host filters over the hostmetrics series),
registers it in the provisioned dashboard list, lists it in the swarm
services handbook, and adds a module-eval case that it ships and every
query filters on both variables.
---
 docs/2-handbook/swarm/services.md             |    1 +
 nix/host-modules/swarm-grafana.nix            |    1 +
 .../swarm-grafana/dashboards/host.json        | 1003 +++++++++++++++++
 nix/module-eval/grafana.nix                   |   17 +
 4 files changed, 1022 insertions(+)
 create mode 100644 nix/host-modules/swarm-grafana/dashboards/host.json

diff --git a/docs/2-handbook/swarm/services.md b/docs/2-handbook/swarm/services.md
index 1ddd6179..c8b54e62 100644
--- a/docs/2-handbook/swarm/services.md
+++ b/docs/2-handbook/swarm/services.md
@@ -212,6 +212,7 @@ kept.
 - `review-classifier`: review requests by outcome, the verdict mix, results per check, retried asks, and run duration p50 and p95.
 - `forge`: the forge, in three tabs. **content** has what the forge holds (repositories, users, issues, releases, discussion volume and the issues by label). **runtime** has the forge process's CPU, memory, goroutines and descriptors. **CI runs** has Actions run time and queue wait per repo and workflow, with a per-PR table; the Repo and Workflow filters apply to that tab.
 - `gateway`: the gateway nginx on each hive's host: requests per second, connections by state, and accepted against handled connections.
+- `host`: the machine under each hive, from the collector's host metrics: CPU by state, load, memory, swap and paging, disk and network throughput, filesystem usage, the Nix store's share and the busiest agent containers. Filter by hive and host.
 - `collector`: what the hive and swarm OTEL collectors accept, refuse, export and queue, with queue depth against capacity.
 - `logstore`, `metricstore`: health of the log store and the metrics store.
 - `grafana`: Grafana itself. Dashboards and data sources, alert instances firing, requests by status and their latency, alert rule evaluations and failures, sign-ins, database connections, memory and goroutines.
diff --git a/nix/host-modules/swarm-grafana.nix b/nix/host-modules/swarm-grafana.nix
index 06a6601a..67677dbf 100644
--- a/nix/host-modules/swarm-grafana.nix
+++ b/nix/host-modules/swarm-grafana.nix
@@ -282,6 +282,7 @@ let
         "forge.json"
         "gateway.json"
         "grafana.json"
+        "host.json"
         "logstore.json"
         "matrix.json"
         "metricstore.json"
diff --git a/nix/host-modules/swarm-grafana/dashboards/host.json b/nix/host-modules/swarm-grafana/dashboards/host.json
new file mode 100644
index 00000000..35e86423
--- /dev/null
+++ b/nix/host-modules/swarm-grafana/dashboards/host.json
@@ -0,0 +1,1003 @@
+{
+  "uid": "hyperhive-host",
+  "title": "hyperhive · host",
+  "description": "CPU, memory, swap, disk, network and filesystem of each hive host.",
+  "tags": ["hyperhive", "host", "system"],
+  "timezone": "utc",
+  "schemaVersion": 39,
+  "version": 1,
+  "editable": true,
+  "refresh": "1m",
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
+  "templating": {
+    "list": [
+      {
+        "name": "hive",
+        "label": "Hive",
+        "type": "query",
+        "datasource": {
+          "type": "prometheus",
+          "uid": "@datasourceUid@"
+        },
+        "query": "label_values({__name__=\"system.memory.usage\"}, hive)",
+        "refresh": 2,
+        "includeAll": true,
+        "allValue": ".*",
+        "multi": true,
+        "current": {
+          "text": "All",
+          "value": "$__all"
+        },
+        "sort": 1
+      },
+      {
+        "name": "host",
+        "label": "Host",
+        "type": "query",
+        "datasource": {
+          "type": "prometheus",
+          "uid": "@datasourceUid@"
+        },
+        "query": "label_values({__name__=\"system.memory.usage\", hive=~\"$hive\"}, \"host.name\")",
+        "refresh": 2,
+        "includeAll": true,
+        "allValue": ".*",
+        "multi": true,
+        "current": {
+          "text": "All",
+          "value": "$__all"
+        },
+        "sort": 1
+      }
+    ]
+  },
+  "panels": [
+    {
+      "id": 1,
+      "type": "timeseries",
+      "title": "CPU utilisation by state",
+      "description": "Share of CPU time per state, all cores of the selected hosts.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 0
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (state) (rate({__name__=\"system.cpu.time\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m])) / scalar(sum(rate({__name__=\"system.cpu.time\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m])))",
+          "legendFormat": "{{state}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "max": 1,
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 30,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0,
+            "stacking": {
+              "mode": "normal",
+              "group": "A"
+            }
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 2,
+      "type": "timeseries",
+      "title": "Load average",
+      "description": "Runnable plus uninterruptible tasks averaged over 1, 5 and 15 minutes.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 0
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "max by (\"host.name\") ({__name__=\"system.cpu.load_average.1m\", hive=~\"$hive\", \"host.name\"=~\"$host\"})",
+          "legendFormat": "{{host.name}} 1m"
+        },
+        {
+          "refId": "B",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "max by (\"host.name\") ({__name__=\"system.cpu.load_average.5m\", hive=~\"$hive\", \"host.name\"=~\"$host\"})",
+          "legendFormat": "{{host.name}} 5m"
+        },
+        {
+          "refId": "C",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "max by (\"host.name\") ({__name__=\"system.cpu.load_average.15m\", hive=~\"$hive\", \"host.name\"=~\"$host\"})",
+          "legendFormat": "{{host.name}} 15m"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 3,
+      "type": "timeseries",
+      "title": "Memory",
+      "description": "Used, cached and free memory.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 8
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (state) ({__name__=\"system.memory.usage\", hive=~\"$hive\", \"host.name\"=~\"$host\", state=~\"used|cached|free\"})",
+          "legendFormat": "{{state}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "bytes",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 30,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0,
+            "stacking": {
+              "mode": "normal",
+              "group": "A"
+            }
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 4,
+      "type": "timeseries",
+      "title": "Swap used",
+      "description": "Swap in use, per swap device.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 6,
+        "x": 12,
+        "y": 8
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (device) ({__name__=\"system.paging.usage\", hive=~\"$hive\", \"host.name\"=~\"$host\", state=\"used\"})",
+          "legendFormat": "{{device}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "bytes",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 5,
+      "type": "timeseries",
+      "title": "Paging in and out",
+      "description": "Pages moved between memory and swap or disk per second.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 6,
+        "x": 18,
+        "y": 8
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (direction, type) (rate({__name__=\"system.paging.operations\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m]))",
+          "legendFormat": "{{direction}} {{type}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "ops",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 6,
+      "type": "timeseries",
+      "title": "Disk throughput",
+      "description": "Bytes read and written per second, per device.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 16
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (device, direction) (rate({__name__=\"system.disk.io\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m]))",
+          "legendFormat": "{{device}} {{direction}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "Bps",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 7,
+      "type": "timeseries",
+      "title": "Disk operations",
+      "description": "Read and write operations per second, per device.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 16
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (device, direction) (rate({__name__=\"system.disk.operations\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m]))",
+          "legendFormat": "{{device}} {{direction}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "iops",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 8,
+      "type": "timeseries",
+      "title": "Network throughput",
+      "description": "Bytes received and transmitted per second, per interface.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 24
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (device, direction) (rate({__name__=\"system.network.io\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m]))",
+          "legendFormat": "{{device}} {{direction}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "Bps",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 9,
+      "type": "timeseries",
+      "title": "Network errors",
+      "description": "Packet errors per second, per interface.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 24
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (device, direction) (rate({__name__=\"system.network.errors\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m]))",
+          "legendFormat": "{{device}} {{direction}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "pps",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 10,
+      "type": "timeseries",
+      "title": "Filesystem usage",
+      "description": "Used share of each mounted filesystem.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 32
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (mountpoint) ({__name__=\"system.filesystem.usage\", hive=~\"$hive\", \"host.name\"=~\"$host\", state=\"used\"}) / sum by (mountpoint) ({__name__=\"system.filesystem.usage\", hive=~\"$hive\", \"host.name\"=~\"$host\", state=~\"used|free\"})",
+          "legendFormat": "{{mountpoint}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "max": 1,
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 11,
+      "type": "stat",
+      "title": "Nix store utilisation",
+      "description": "Used share of the filesystem holding the Nix store.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 4,
+        "x": 12,
+        "y": 32
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "max by (\"host.name\") ({__name__=\"hyperhive.hive.nix_store.utilization\", hive=~\"$hive\", \"host.name\"=~\"$host\"})",
+          "legendFormat": "{{host.name}}",
+          "instant": true
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "color": {
+            "mode": "thresholds"
+          },
+          "min": 0,
+          "max": 1,
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "orange",
+                "value": 0.8
+              },
+              {
+                "color": "red",
+                "value": 0.9
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "graphMode": "none",
+        "colorMode": "value",
+        "textMode": "value",
+        "justifyMode": "auto",
+        "reduceOptions": {
+          "calcs": ["lastNotNull"],
+          "fields": "",
+          "values": false
+        }
+      }
+    },
+    {
+      "id": 12,
+      "type": "stat",
+      "title": "Uptime",
+      "description": "Time since the host booted.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 4,
+        "x": 16,
+        "y": 32
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "max by (\"host.name\") ({__name__=\"system.uptime\", hive=~\"$hive\", \"host.name\"=~\"$host\"})",
+          "legendFormat": "{{host.name}}",
+          "instant": true
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "s",
+          "color": {
+            "mode": "thresholds"
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "graphMode": "none",
+        "colorMode": "value",
+        "textMode": "value",
+        "justifyMode": "auto",
+        "reduceOptions": {
+          "calcs": ["lastNotNull"],
+          "fields": "",
+          "values": false
+        }
+      }
+    },
+    {
+      "id": 13,
+      "type": "stat",
+      "title": "Processes",
+      "description": "Processes on the host in any state.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 4,
+        "x": 20,
+        "y": 32
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (\"host.name\") ({__name__=\"system.processes.count\", hive=~\"$hive\", \"host.name\"=~\"$host\"})",
+          "legendFormat": "{{host.name}}",
+          "instant": true
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short",
+          "color": {
+            "mode": "thresholds"
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "graphMode": "none",
+        "colorMode": "value",
+        "textMode": "value",
+        "justifyMode": "auto",
+        "reduceOptions": {
+          "calcs": ["lastNotNull"],
+          "fields": "",
+          "values": false
+        }
+      }
+    },
+    {
+      "id": 14,
+      "type": "timeseries",
+      "title": "Processes by status",
+      "description": "Process count per status.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 8,
+        "x": 16,
+        "y": 36
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "sum by (status) ({__name__=\"system.processes.count\", hive=~\"$hive\", \"host.name\"=~\"$host\"})",
+          "legendFormat": "{{status}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 30,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0,
+            "stacking": {
+              "mode": "normal",
+              "group": "A"
+            }
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 15,
+      "type": "timeseries",
+      "title": "Top 10 containers by memory",
+      "description": "Agent containers using the most memory.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 40
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "topk(10, sum by (agent) ({__name__=\"container.memory.usage\", hive=~\"$hive\", \"host.name\"=~\"$host\"}))",
+          "legendFormat": "{{agent}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "bytes",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 16,
+      "type": "timeseries",
+      "title": "Top 10 containers by CPU",
+      "description": "Agent containers using the most CPU, in cores.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "@datasourceUid@"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 40
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "@datasourceUid@"
+          },
+          "expr": "topk(10, sum by (agent) (rate({__name__=\"container.cpu.time\", hive=~\"$hive\", \"host.name\"=~\"$host\"}[5m])))",
+          "legendFormat": "{{agent}}"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "none",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 1,
+            "fillOpacity": 10,
+            "showPoints": "never",
+            "spanNulls": false,
+            "axisSoftMin": 0
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true,
+          "calcs": []
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    }
+  ]
+}
diff --git a/nix/module-eval/grafana.nix b/nix/module-eval/grafana.nix
index 7aed754e..1dab6b43 100644
--- a/nix/module-eval/grafana.nix
+++ b/nix/module-eval/grafana.nix
@@ -624,6 +624,23 @@ let
           ]
         ) tables;
     }
+    {
+      # The host board ships, and every query filters on both template
+      # variables: a panel missing one shows another hive's or host's numbers
+      # under this selection.
+      name = "the host dashboard ships, and every panel query filters on hive and host";
+      ok =
+        let
+          provider = lib.head grafanaWithAuthelia.containers.swarm-grafana.config.services.grafana.provision.dashboards.settings.providers;
+          shipped = lib.attrNames provider.options.path.entries;
+          board = builtins.fromJSON (builtins.readFile ../host-modules/swarm-grafana/dashboards/host.json);
+          exprs = lib.concatMap (p: map (t: t.expr) p.targets) board.panels;
+        in
+        lib.elem "host.json" shipped
+        && lib.length exprs > 0
+        && lib.all (e: lib.hasInfix "hive=~\"$hive\"" e && lib.hasInfix "\"host.name\"=~\"$host\"" e) exprs
+        && lib.any (e: lib.hasInfix "system.cpu.time" e) exprs;
+    }
     {
       # The egress board ships, and its queries read the two squid log lines as
       # squid writes them: the would_deny line's field layout, and the default