generate the dashboards at build time instead of committing them

The JSON is machine-written and the generator beside it is the only source of
truth, so committing both only created a way for them to drift -- which is what
the dashboards-current check existed to police. modules/dashboards.nix now runs
gen_zfs.py / gen_smart.py in the derivation, so a stale dashboard cannot be
built at all and the check is gone.

Note there is no third option: flakes copy only git-tracked files into the
store, so a gitignored dashboards/*.json cannot be read from disk either. It is
generate, or commit.

Verified equivalent -- both generated dashboards are byte-identical to the JSON
this commit deletes.

Adds a dashboards-nonempty check. Factoring the shared jq invocation out first
introduced a bug it caught: the multi-line string ended in a newline, so the
callers' `< $src > "$out"` landed on a line of its own as a separate command,
truncating every dashboard to zero bytes while the build still succeeded. All
four provisioned dashboards were empty. jqFixup is now a single line, and the
check asserts each dashboard is non-empty and has a title, uid and panels.

Both failure modes are exercised: an empty dashboard and one with no panels each
fail the check. It also asserts it found four files, because the first version
globbed *.json against linkFarm entries named without the suffix and passed
vacuously.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JKczN1f66kmLxNBLX37voQ

6 files changed, 119 insertions, 8338 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b49e032
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+# Generated by dashboards/gen_*.py; the build runs the generators itself.
+dashboards/*.json
+__pycache__/
diff --git a/README.md b/README.md
index 7bcea7f..9014e1b 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,7 @@ What *has* been checked:
 
 - every dashboard query executed against a real Prometheus fed fixture data
 - `promtool` over the recording rules and the generated scrape config
-- `nix flake check`: both modules evaluate, and the committed dashboard JSON matches what
-  the generators produce
+- `nix flake check`: both modules evaluate, and both dashboard generators run
 - the collectors run against mock `smartctl`/`zpool`/`zfs`, and partially against real
   hardware
 
@@ -225,21 +224,23 @@ modules/
   dashboards.nix        builds dashboard JSON into a provisionable form
   packages.nix          the two collectors as ordinary packages
 collectors/*.py         the collectors themselves; runnable by hand
-dashboards/gen_*.py     dashboard generators
-dashboards/*.json       generated, committed, checked
+dashboards/gen_*.py     dashboard generators; the JSON is built, not committed
 rules/smartctl.yml      Prometheus recording rules
 ```
 
 ## Working on it
 
-Dashboard JSON is **generated** — edit `dashboards/gen_*.py`, never the JSON:
+The ZFS Pools and Drive Health dashboards are **generated at build time** from
+`dashboards/gen_*.py`; no JSON is committed, so there is nothing to keep in sync and no
+way to ship a stale dashboard. To see what a generator currently produces:
 
 ```sh
-python3 dashboards/gen_zfs.py   > dashboards/zfs-pools.json
-python3 dashboards/gen_smart.py > dashboards/smart.json
+python3 dashboards/gen_zfs.py   | less
+nix build .#nixosConfigurations.<host>.config.system.build.toplevel   # or just deploy
 ```
 
-`nix flake check` fails if you forget.
+(Flakes copy only git-tracked files into the store, so "gitignore the JSON and read it
+from disk anyway" is not an option — it is generate, or commit.)
 
 The collectors are plain scripts taking `--output PATH`, so you can see exactly what a
 machine reports:
diff --git a/dashboards/smart.json b/dashboards/smart.json
deleted file mode 100644
index f6c9867..0000000
--- a/dashboards/smart.json
+++ /dev/null
@@ -1,3865 +0,0 @@
-{
-  "title": "Drive Health (SMART)",
-  "uid": "drive-health-smart",
-  "description": "Per-drive SMART health in the style of CrystalDiskInfo: a Good/Caution/Bad verdict, full raw attribute tables for SATA, SCSI error counters for SAS, and self-test history.",
-  "tags": [
-    "smart",
-    "storage",
-    "hardware"
-  ],
-  "timezone": "browser",
-  "schemaVersion": 41,
-  "version": 1,
-  "editable": true,
-  "graphTooltip": 1,
-  "refresh": "1m",
-  "time": {
-    "from": "now-24h",
-    "to": "now"
-  },
-  "templating": {
-    "list": [
-      {
-        "name": "host",
-        "label": "Host",
-        "type": "query",
-        "datasource": {
-          "type": "prometheus",
-          "uid": "prometheus"
-        },
-        "query": {
-          "qryType": 1,
-          "query": "label_values(smartctl_device_smart_status, host)",
-          "refId": "PrometheusVariableQueryEditor-VariableQuery"
-        },
-        "refresh": 1,
-        "includeAll": false,
-        "multi": false,
-        "options": [],
-        "sort": 1,
-        "hide": 0,
-        "regex": ""
-      },
-      {
-        "name": "ata_device",
-        "label": "SATA drive",
-        "type": "query",
-        "datasource": {
-          "type": "prometheus",
-          "uid": "prometheus"
-        },
-        "query": {
-          "qryType": 1,
-          "query": "label_values(smartctl:row{bus=\"ata\", host=~\"$host\"}, row)",
-          "refId": "PrometheusVariableQueryEditor-VariableQuery"
-        },
-        "refresh": 1,
-        "includeAll": true,
-        "multi": true,
-        "options": [],
-        "sort": 1,
-        "hide": 0,
-        "regex": "/^(?<text>(?<value>\\S+)\\s.*)$/",
-        "allValue": ".*",
-        "current": {
-          "text": [
-            "All"
-          ],
-          "value": [
-            "$__all"
-          ]
-        }
-      },
-      {
-        "name": "sas_device",
-        "label": "SAS drive",
-        "type": "query",
-        "datasource": {
-          "type": "prometheus",
-          "uid": "prometheus"
-        },
-        "query": {
-          "qryType": 1,
-          "query": "label_values(smartctl:row{bus=\"sas\", host=~\"$host\"}, row)",
-          "refId": "PrometheusVariableQueryEditor-VariableQuery"
-        },
-        "refresh": 1,
-        "includeAll": true,
-        "multi": true,
-        "options": [],
-        "sort": 1,
-        "hide": 0,
-        "regex": "/^(?<text>(?<value>\\S+)\\s.*)$/",
-        "allValue": ".*",
-        "current": {
-          "text": [
-            "All"
-          ],
-          "value": [
-            "$__all"
-          ]
-        }
-      }
-    ]
-  },
-  "annotations": {
-    "list": [
-      {
-        "builtIn": 1,
-        "datasource": {
-          "type": "datasource",
-          "uid": "grafana"
-        },
-        "enable": true,
-        "hide": true,
-        "iconColor": "rgba(0, 211, 255, 1)",
-        "name": "Annotations & Alerts",
-        "type": "dashboard"
-      }
-    ]
-  },
-  "panels": [
-    {
-      "type": "row",
-      "title": "Fleet Overview",
-      "id": 1,
-      "gridPos": {
-        "h": 1,
-        "w": 24,
-        "x": 0,
-        "y": 0
-      },
-      "collapsed": false,
-      "panels": []
-    },
-    {
-      "type": "stat",
-      "title": "Healthy",
-      "description": "Drives with no failing attribute, no SCSI uncorrected errors and a passing SMART self-assessment.",
-      "id": 2,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 0,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              }
-            ]
-          }
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "count(smartctl:health_code{host=~\"$host\"} == 0) or vector(0)",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "drives"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Caution",
-      "description": "Reallocated / pending / uncorrectable sectors on SATA, or a non-empty grown defect list on SAS. Not failing yet \u2014 worth watching the trend.",
-      "id": 3,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 4,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "orange",
-                "value": 1
-              }
-            ]
-          }
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "count(smartctl:health_code{host=~\"$host\"} == 1) or vector(0)",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "drives"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Failing",
-      "description": "SMART self-assessment failed, an attribute is at or below its threshold, or the drive reported errors it could not correct. Replace these.",
-      "id": 4,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 8,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "red",
-                "value": 1
-              }
-            ]
-          }
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "count(smartctl:health_code{host=~\"$host\"} == 2) or vector(0)",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "drives"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Drives",
-      "description": "",
-      "id": 5,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 12,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              }
-            ]
-          }
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "value",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "count(smartctl_device_smart_status{host=~\"$host\"})",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "total"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Hottest Drive",
-      "description": "",
-      "id": 6,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 16,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "yellow",
-                "value": 45
-              },
-              {
-                "color": "red",
-                "value": 55
-              }
-            ]
-          },
-          "unit": "celsius"
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "max(smartctl_device_temperature{host=~\"$host\", temperature_type=\"current\"})",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "max"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Longest Powered On",
-      "description": "",
-      "id": 7,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 20,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              }
-            ]
-          },
-          "unit": "s"
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "value",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "max(max by (device) (smartctl_device_power_on_seconds{host=~\"$host\"} or (smart_selftest_last_lifetime_hours{host=~\"$host\"} * 3600)))",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "max"
-        }
-      ]
-    },
-    {
-      "type": "table",
-      "title": "All Drives",
-      "description": "Every drive, worst first. Health is computed by rules/smartctl.yml.",
-      "id": 8,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 10,
-        "w": 16,
-        "x": 0,
-        "y": 5
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "custom": {
-            "align": "auto",
-            "cellOptions": {
-              "type": "auto"
-            },
-            "inspect": false,
-            "filterable": true
-          },
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              }
-            ]
-          }
-        },
-        "overrides": [
-          {
-            "matcher": {
-              "id": "byName",
-              "options": "Health"
-            },
-            "properties": [
-              {
-                "id": "mappings",
-                "value": [
-                  {
-                    "type": "value",
-                    "options": {
-                      "0": {
-                        "text": "GOOD",
-                        "color": "green",
-                        "index": 0
-                      },
-                      "1": {
-                        "text": "CAUTION",
-                        "color": "orange",
-                        "index": 1
-                      },
-                      "2": {
-                        "text": "BAD",
-                        "color": "red",
-                        "index": 2
-                      }
-                    }
-                  }
-                ]
-              },
-              {
-                "id": "thresholds",
-                "value": {
-                  "mode": "absolute",
-                  "steps": [
-                    {
-                      "color": "green",
-                      "value": null
-                    },
-                    {
-                      "color": "orange",
-                      "value": 1
-                    },
-                    {
-                      "color": "red",
-                      "value": 2
-                    }
-                  ]
-                }
-              },
-              {
-                "id": "custom.cellOptions",
-                "value": {
-                  "type": "color-background",
-                  "mode": "basic"
-                }
-              }
-            ]
-          },
-          {
-            "matcher": {
-              "id": "byName",
-              "options": "Temp"
-            },
-            "properties": [
-              {
-                "id": "unit",
-                "value": "celsius"
-              }
-            ]
-          },
-          {
-            "matcher": {
-              "id": "byName",
-              "options": "Powered On"
-            },
-            "properties": [
-              {
-                "id": "unit",
-                "value": "s"
-              }
-            ]
-          },
-          {
-            "matcher": {
-              "id": "byName",
-              "options": "Capacity"
-            },
-            "properties": [
-              {
-                "id": "unit",
-                "value": "bytes"
-              }
-            ]
-          }
-        ]
-      },
-      "options": {
-        "showHeader": true,
-        "cellHeight": "sm",
-        "footer": {
-          "show": false,
-          "reducer": [
-            "sum"
-          ],
-          "countRows": false,
-          "fields": ""
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "smartctl:health_code{host=~\"$host\"} * on(device) group_left(model_name, serial_number, protocol) smartctl_device{host=~\"$host\"}",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "format": "table"
-        },
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "max by (device) (smartctl_device_temperature{host=~\"$host\", temperature_type=\"current\"})",
-          "refId": "B",
-          "instant": true,
-          "range": false,
-          "format": "table"
-        },
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "max by (device) (smartctl_device_power_on_seconds{host=~\"$host\"} or (smart_selftest_last_lifetime_hours{host=~\"$host\"} * 3600))",
-          "refId": "C",
-          "instant": true,
-          "range": false,
-          "format": "table"
-        },
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "max by (device) (smartctl_device_capacity_bytes{host=~\"$host\"})",
-          "refId": "D",
-          "instant": true,
-          "range": false,
-          "format": "table"
-        }
-      ],
-      "transformations": [
-        {
-          "id": "filterFieldsByName",
-          "options": {
-            "include": {
-              "pattern": "device|model_name|serial_number|protocol|Value.*"
-            }
-          }
-        },
-        {
-          "id": "joinByField",
-          "options": {
-            "byField": "device",
-            "mode": "outer"
-          }
-        },
-        {
-          "id": "organize",
-          "options": {
-            "excludeByName": {},
-            "indexByName": {
-              "device": 0,
-              "model_name": 1,
-              "serial_number": 2,
-              "protocol": 3,
-              "Value #A": 4,
-              "Value #B": 5,
-              "Value #C": 6,
-              "Value #D": 7
-            },
-            "renameByName": {
-              "device": "Device",
-              "model_name": "Model",
-              "serial_number": "Serial",
-              "protocol": "Bus",
-              "Value #A": "Health",
-              "Value #B": "Temp",
-              "Value #C": "Powered On",
-              "Value #D": "Capacity"
-            }
-          }
-        },
-        {
-          "id": "sortBy",
-          "options": {
-            "fields": {},
-            "sort": [
-              {
-                "field": "Health",
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-              "attribute_name": 1,
-              "Value #A": 2,
-              "Value #B": 3,
-              "Value #C": 4,
-              "Value #D": 5,
-              "Value #E": 6
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-            "renameByName": {
-              "attribute_id": "ID",
-              "attribute_name": "Attribute",
-              "Value #A": "Current",
-              "Value #B": "Worst",
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-                "field": "Attribute",
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-              "type": "value",
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-                  "text": "GOOD",
-                  "color": "green",
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-                  "text": "CAUTION",
-                  "color": "orange",
-                  "index": 1
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-                  "text": "BAD",
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-      "title": "Temperature",
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-          "legendFormat": "hours"
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-          "instant": true,
-          "range": false,
-          "legendFormat": "bps"
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-    },
-    {
-      "type": "stat",
-      "title": "Grown Defects",
-      "description": "Sectors reallocated since the drive left the factory \u2014 the SAS equivalent of ATA attribute 5. A stable non-zero count is tolerable; growth is not.",
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-          "legendFormat": "defects"
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-    },
-    {
-      "type": "stat",
-      "title": "Uncorrected Errors",
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-        "uid": "prometheus"
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-          "instant": true,
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-    },
-    {
-      "type": "table",
-      "title": "Drive \u2014 $sas_device",
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-                "id": "unit",
-                "value": "bytes"
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-          {
-            "matcher": {
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-              "options": "RPM"
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-            "properties": [
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-                "id": "unit",
-                "value": "rotrpm"
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-              "scsi_version": "SCSI",
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-              "form_factor": "Form"
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-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "unit": "bytes",
-              "min": 0
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "smartctl_device_bytes_written{host=~\"$host\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "{{device}} written"
-            },
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "smartctl_device_bytes_read{host=~\"$host\"}",
-              "refId": "B",
-              "instant": false,
-              "range": true,
-              "legendFormat": "{{device}} read"
-            }
-          ]
-        },
-        {
-          "type": "timeseries",
-          "title": "Health Code History",
-          "description": "",
-          "id": 40,
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "gridPos": {
-            "h": 7,
-            "w": 12,
-            "x": 12,
-            "y": 72
-          },
-          "fieldConfig": {
-            "defaults": {
-              "color": {
-                "mode": "palette-classic"
-              },
-              "custom": {
-                "drawStyle": "line",
-                "lineInterpolation": "stepAfter",
-                "lineWidth": 2,
-                "fillOpacity": 0,
-                "showPoints": "never",
-                "spanNulls": true,
-                "axisBorderShow": false,
-                "axisCenteredZero": false,
-                "gradientMode": "none",
-                "pointSize": 5,
-                "scaleDistribution": {
-                  "type": "linear"
-                },
-                "stacking": {
-                  "group": "A",
-                  "mode": "none"
-                },
-                "thresholdsStyle": {
-                  "mode": "off"
-                }
-              },
-              "mappings": [
-                {
-                  "type": "value",
-                  "options": {
-                    "0": {
-                      "text": "GOOD",
-                      "color": "green",
-                      "index": 0
-                    },
-                    "1": {
-                      "text": "CAUTION",
-                      "color": "orange",
-                      "index": 1
-                    },
-                    "2": {
-                      "text": "BAD",
-                      "color": "red",
-                      "index": 2
-                    }
-                  }
-                }
-              ],
-              "thresholds": {
-                "mode": "absolute",
-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "min": 0,
-              "max": 2
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "smartctl:health_code{host=~\"$host\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "{{device}}"
-            }
-          ]
-        }
-      ]
-    },
-    {
-      "type": "row",
-      "title": "Collector Health",
-      "id": 45,
-      "gridPos": {
-        "h": 1,
-        "w": 24,
-        "x": 0,
-        "y": 65
-      },
-      "collapsed": true,
-      "panels": [
-        {
-          "type": "timeseries",
-          "title": "smartctl Exit Status",
-          "description": "Non-zero means smartctl itself had trouble reading the device. Bit 0 is a command-line problem, bit 1 a device-open failure, bit 3 a failing drive.",
-          "id": 42,
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "gridPos": {
-            "h": 7,
-            "w": 8,
-            "x": 0,
-            "y": 66
-          },
-          "fieldConfig": {
-            "defaults": {
-              "color": {
-                "mode": "palette-classic"
-              },
-              "custom": {
-                "drawStyle": "line",
-                "lineInterpolation": "linear",
-                "lineWidth": 1,
-                "fillOpacity": 15,
-                "showPoints": "never",
-                "spanNulls": true,
-                "axisBorderShow": false,
-                "axisCenteredZero": false,
-                "gradientMode": "none",
-                "pointSize": 5,
-                "scaleDistribution": {
-                  "type": "linear"
-                },
-                "stacking": {
-                  "group": "A",
-                  "mode": "none"
-                },
-                "thresholdsStyle": {
-                  "mode": "off"
-                }
-              },
-              "mappings": [],
-              "thresholds": {
-                "mode": "absolute",
-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "min": 0
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "smartctl_device_smartctl_exit_status{host=~\"$host\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "{{device}}"
-            }
-          ]
-        },
-        {
-          "type": "timeseries",
-          "title": "Self-Test Collector Duration",
-          "description": "",
-          "id": 43,
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "gridPos": {
-            "h": 7,
-            "w": 8,
-            "x": 8,
-            "y": 66
-          },
-          "fieldConfig": {
-            "defaults": {
-              "color": {
-                "mode": "palette-classic"
-              },
-              "custom": {
-                "drawStyle": "line",
-                "lineInterpolation": "linear",
-                "lineWidth": 1,
-                "fillOpacity": 15,
-                "showPoints": "never",
-                "spanNulls": true,
-                "axisBorderShow": false,
-                "axisCenteredZero": false,
-                "gradientMode": "none",
-                "pointSize": 5,
-                "scaleDistribution": {
-                  "type": "linear"
-                },
-                "stacking": {
-                  "group": "A",
-                  "mode": "none"
-                },
-                "thresholdsStyle": {
-                  "mode": "off"
-                }
-              },
-              "mappings": [],
-              "thresholds": {
-                "mode": "absolute",
-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "unit": "s",
-              "min": 0
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "smart_selftest_collection_duration_seconds{host=~\"$host\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "collection"
-            }
-          ]
-        },
-        {
-          "type": "timeseries",
-          "title": "Devices Seen",
-          "description": "These should agree. A divergence means one of the two cannot see some drives.",
-          "id": 44,
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "gridPos": {
-            "h": 7,
-            "w": 8,
-            "x": 16,
-            "y": 66
-          },
-          "fieldConfig": {
-            "defaults": {
-              "color": {
-                "mode": "palette-classic"
-              },
-              "custom": {
-                "drawStyle": "line",
-                "lineInterpolation": "linear",
-                "lineWidth": 1,
-                "fillOpacity": 15,
-                "showPoints": "never",
-                "spanNulls": true,
-                "axisBorderShow": false,
-                "axisCenteredZero": false,
-                "gradientMode": "none",
-                "pointSize": 5,
-                "scaleDistribution": {
-                  "type": "linear"
-                },
-                "stacking": {
-                  "group": "A",
-                  "mode": "none"
-                },
-                "thresholdsStyle": {
-                  "mode": "off"
-                }
-              },
-              "mappings": [],
-              "thresholds": {
-                "mode": "absolute",
-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "min": 0
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "smartctl_devices{host=~\"$host\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "exporter"
-            },
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "smart_selftest_devices{host=~\"$host\"}",
-              "refId": "B",
-              "instant": false,
-              "range": true,
-              "legendFormat": "self-test collector"
-            }
-          ]
-        }
-      ]
-    }
-  ]
-}
diff --git a/dashboards/zfs-pools.json b/dashboards/zfs-pools.json
deleted file mode 100644
index c36a42a..0000000
--- a/dashboards/zfs-pools.json
+++ /dev/null
@@ -1,4395 +0,0 @@
-{
-  "title": "ZFS Pools",
-  "uid": "zfs-pools",
-  "description": "ZFS capacity, health, integrity, snapshot retention, dataset properties and performance. Fed by node_exporter's zfs and systemd collectors plus collectors/zfs-metrics.py from lgtm.nix.",
-  "tags": [
-    "zfs",
-    "storage"
-  ],
-  "timezone": "browser",
-  "schemaVersion": 41,
-  "version": 1,
-  "editable": true,
-  "graphTooltip": 1,
-  "refresh": "1m",
-  "time": {
-    "from": "now-24h",
-    "to": "now"
-  },
-  "templating": {
-    "list": [
-      {
-        "name": "host",
-        "label": "Host",
-        "type": "query",
-        "datasource": {
-          "type": "prometheus",
-          "uid": "prometheus"
-        },
-        "query": {
-          "qryType": 1,
-          "query": "label_values(zfs_pool_health_code, host)",
-          "refId": "PrometheusVariableQueryEditor-VariableQuery"
-        },
-        "refresh": 1,
-        "includeAll": false,
-        "multi": false,
-        "options": [],
-        "sort": 1,
-        "hide": 0,
-        "regex": ""
-      },
-      {
-        "name": "pool",
-        "label": "Pool",
-        "type": "query",
-        "datasource": {
-          "type": "prometheus",
-          "uid": "prometheus"
-        },
-        "query": {
-          "qryType": 1,
-          "query": "label_values(zfs_pool_health_code{host=~\"$host\"}, pool)",
-          "refId": "PrometheusVariableQueryEditor-VariableQuery"
-        },
-        "refresh": 1,
-        "includeAll": true,
-        "multi": true,
-        "options": [],
-        "sort": 1,
-        "hide": 0,
-        "regex": "",
-        "allValue": ".*",
-        "current": {
-          "text": [
-            "All"
-          ],
-          "value": [
-            "$__all"
-          ]
-        }
-      }
-    ]
-  },
-  "annotations": {
-    "list": [
-      {
-        "builtIn": 1,
-        "datasource": {
-          "type": "datasource",
-          "uid": "grafana"
-        },
-        "enable": true,
-        "hide": true,
-        "iconColor": "rgba(0, 211, 255, 1)",
-        "name": "Annotations & Alerts",
-        "type": "dashboard"
-      }
-    ]
-  },
-  "panels": [
-    {
-      "type": "row",
-      "title": "Pool Overview",
-      "id": 1,
-      "gridPos": {
-        "h": 1,
-        "w": 24,
-        "x": 0,
-        "y": 0
-      },
-      "collapsed": false,
-      "panels": []
-    },
-    {
-      "type": "stat",
-      "title": "Pool Health",
-      "description": "Health as reported by `zpool list -o health`.",
-      "id": 2,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 0,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [
-            {
-              "type": "value",
-              "options": {
-                "0": {
-                  "text": "ONLINE",
-                  "color": "green",
-                  "index": 0
-                },
-                "1": {
-                  "text": "DEGRADED",
-                  "color": "orange",
-                  "index": 1
-                },
-                "2": {
-                  "text": "FAULTED",
-                  "color": "red",
-                  "index": 2
-                },
-                "3": {
-                  "text": "OFFLINE",
-                  "color": "text",
-                  "index": 3
-                },
-                "4": {
-                  "text": "UNAVAIL",
-                  "color": "red",
-                  "index": 4
-                },
-                "5": {
-                  "text": "REMOVED",
-                  "color": "purple",
-                  "index": 5
-                },
-                "6": {
-                  "text": "SUSPENDED",
-                  "color": "red",
-                  "index": 6
-                },
-                "7": {
-                  "text": "AVAIL",
-                  "color": "blue",
-                  "index": 7
-                },
-                "8": {
-                  "text": "UNKNOWN",
-                  "color": "text",
-                  "index": 8
-                }
-              }
-            }
-          ],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              }
-            ]
-          }
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "zfs_pool_health_code{host=~\"$host\", pool=~\"$pool\"}",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "{{pool}}"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Data Errors",
-      "description": "Permanent, unrepairable errors from `zpool status`. Anything above zero means data has been lost and the affected files need restoring.",
-      "id": 3,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 4,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "red",
-                "value": 1
-              }
-            ]
-          }
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "sum(zfs_pool_data_errors{host=~\"$host\", pool=~\"$pool\"}) or vector(0)",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "errors"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "vdev Errors",
-      "description": "Total read + write + checksum errors across all vdevs. Cleared by `zpool clear`.",
-      "id": 4,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 8,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "red",
-                "value": 1
-              }
-            ]
-          }
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "sum(zfs_pool_vdev_errors_total{host=~\"$host\", pool=~\"$pool\"}) or vector(0)",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "errors"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Last Scrub",
-      "description": "Time since the most recent completed scrub. Turns amber past ~5 weeks, which is a monthly scrub schedule having missed a run.",
-      "id": 5,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 12,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "yellow",
-                "value": 3024000
-              },
-              {
-                "color": "red",
-                "value": 6048000
-              }
-            ]
-          },
-          "unit": "s"
-        },
-        "overrides": []
-      },
-      "options": {
-        "colorMode": "background",
-        "graphMode": "none",
-        "justifyMode": "auto",
-        "orientation": "auto",
-        "textMode": "auto",
-        "wideLayout": true,
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        }
-      },
-      "targets": [
-        {
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "editorMode": "code",
-          "expr": "time() - max(zfs_pool_last_scrub_end_timestamp_seconds{host=~\"$host\", pool=~\"$pool\"})",
-          "refId": "A",
-          "instant": true,
-          "range": false,
-          "legendFormat": "ago"
-        }
-      ]
-    },
-    {
-      "type": "stat",
-      "title": "Scrub / Resilver",
-      "description": "",
-      "id": 6,
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "gridPos": {
-        "h": 4,
-        "w": 4,
-        "x": 16,
-        "y": 1
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "thresholds"
-          },
-          "mappings": [
-            {
-              "type": "value",
-              "options": {
-                "0": {
-                  "text": "idle",
-                  "color": "green",
-                  "index": 0
-                },
-                "1": {
-                  "text": "RUNNING",
-                  "color": "blue",
-                  "index": 1
-                }
-              }
-            }
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-              "refId": "A",
-              "instant": true,
-              "range": false,
-              "format": "table"
-            },
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "zfs_dataset_quota_bytes{host=~\"$host\", pool=~\"$pool\"}",
-              "refId": "B",
-              "instant": true,
-              "range": false,
-              "format": "table"
-            },
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "zfs_dataset_refquota_bytes{host=~\"$host\", pool=~\"$pool\"}",
-              "refId": "C",
-              "instant": true,
-              "range": false,
-              "format": "table"
-            },
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "zfs_dataset_autosnapshot_enabled{host=~\"$host\", pool=~\"$pool\"}",
-              "refId": "D",
-              "instant": true,
-              "range": false,
-              "format": "table"
-            }
-          ],
-          "transformations": [
-            {
-              "id": "filterFieldsByName",
-              "options": {
-                "include": {
-                  "pattern": "dataset|Value.*"
-                }
-              }
-            },
-            {
-              "id": "joinByField",
-              "options": {
-                "byField": "dataset",
-                "mode": "outer"
-              }
-            },
-            {
-              "id": "organize",
-              "options": {
-                "excludeByName": {},
-                "indexByName": {},
-                "renameByName": {
-                  "dataset": "Dataset",
-                  "Value #A": "Record Size",
-                  "Value #B": "Quota",
-                  "Value #C": "Ref Quota",
-                  "Value #D": "Auto-snapshot"
-                }
-              }
-            }
-          ]
-        }
-      ]
-    },
-    {
-      "type": "row",
-      "title": "Collector Health",
-      "id": 48,
-      "gridPos": {
-        "h": 1,
-        "w": 24,
-        "x": 0,
-        "y": 109
-      },
-      "collapsed": true,
-      "panels": [
-        {
-          "type": "timeseries",
-          "title": "ZFS Collector Duration",
-          "description": "How long collectors/zfs-metrics.py takes. Listing every snapshot is the slow part; if this approaches the 1 minute timer interval, raise OnUnitActiveSec.",
-          "id": 45,
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "gridPos": {
-            "h": 7,
-            "w": 8,
-            "x": 0,
-            "y": 110
-          },
-          "fieldConfig": {
-            "defaults": {
-              "color": {
-                "mode": "palette-classic"
-              },
-              "custom": {
-                "drawStyle": "line",
-                "lineInterpolation": "linear",
-                "lineWidth": 1,
-                "fillOpacity": 15,
-                "showPoints": "never",
-                "spanNulls": true,
-                "axisBorderShow": false,
-                "axisCenteredZero": false,
-                "gradientMode": "none",
-                "pointSize": 5,
-                "scaleDistribution": {
-                  "type": "linear"
-                },
-                "stacking": {
-                  "group": "A",
-                  "mode": "none"
-                },
-                "thresholdsStyle": {
-                  "mode": "off"
-                }
-              },
-              "mappings": [],
-              "thresholds": {
-                "mode": "absolute",
-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "unit": "s",
-              "min": 0
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "zfs_metrics_collection_duration_seconds{host=~\"$host\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "collection"
-            }
-          ]
-        },
-        {
-          "type": "timeseries",
-          "title": "Textfile Age",
-          "description": "Age of each .prom file. If this climbs without bound the collector has stopped writing and every ZFS metric above is stale.",
-          "id": 46,
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "gridPos": {
-            "h": 7,
-            "w": 8,
-            "x": 8,
-            "y": 110
-          },
-          "fieldConfig": {
-            "defaults": {
-              "color": {
-                "mode": "palette-classic"
-              },
-              "custom": {
-                "drawStyle": "line",
-                "lineInterpolation": "linear",
-                "lineWidth": 1,
-                "fillOpacity": 15,
-                "showPoints": "never",
-                "spanNulls": true,
-                "axisBorderShow": false,
-                "axisCenteredZero": false,
-                "gradientMode": "none",
-                "pointSize": 5,
-                "scaleDistribution": {
-                  "type": "linear"
-                },
-                "stacking": {
-                  "group": "A",
-                  "mode": "none"
-                },
-                "thresholdsStyle": {
-                  "mode": "off"
-                }
-              },
-              "mappings": [],
-              "thresholds": {
-                "mode": "absolute",
-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "unit": "s",
-              "min": 0
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "time() - node_textfile_mtime_seconds{host=~\"$host\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "{{file}}"
-            }
-          ]
-        },
-        {
-          "type": "timeseries",
-          "title": "Scrape Health",
-          "description": "node_textfile_scrape_error goes to 1 if a .prom file is malformed, in which case node_exporter drops it entirely.",
-          "id": 47,
-          "datasource": {
-            "type": "prometheus",
-            "uid": "prometheus"
-          },
-          "gridPos": {
-            "h": 7,
-            "w": 8,
-            "x": 16,
-            "y": 110
-          },
-          "fieldConfig": {
-            "defaults": {
-              "color": {
-                "mode": "palette-classic"
-              },
-              "custom": {
-                "drawStyle": "line",
-                "lineInterpolation": "linear",
-                "lineWidth": 1,
-                "fillOpacity": 15,
-                "showPoints": "never",
-                "spanNulls": true,
-                "axisBorderShow": false,
-                "axisCenteredZero": false,
-                "gradientMode": "none",
-                "pointSize": 5,
-                "scaleDistribution": {
-                  "type": "linear"
-                },
-                "stacking": {
-                  "group": "A",
-                  "mode": "none"
-                },
-                "thresholdsStyle": {
-                  "mode": "off"
-                }
-              },
-              "mappings": [],
-              "thresholds": {
-                "mode": "absolute",
-                "steps": [
-                  {
-                    "color": "green",
-                    "value": null
-                  }
-                ]
-              },
-              "min": 0
-            },
-            "overrides": []
-          },
-          "options": {
-            "legend": {
-              "calcs": [
-                "lastNotNull",
-                "max"
-              ],
-              "displayMode": "table",
-              "placement": "bottom",
-              "showLegend": true
-            },
-            "tooltip": {
-              "mode": "multi",
-              "sort": "desc"
-            }
-          },
-          "targets": [
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "up{job=\"node\"}",
-              "refId": "A",
-              "instant": false,
-              "range": true,
-              "legendFormat": "node exporter up"
-            },
-            {
-              "datasource": {
-                "type": "prometheus",
-                "uid": "prometheus"
-              },
-              "editorMode": "code",
-              "expr": "node_textfile_scrape_error{host=~\"$host\"}",
-              "refId": "B",
-              "instant": false,
-              "range": true,
-              "legendFormat": "textfile parse error"
-            }
-          ]
-        }
-      ]
-    }
-  ]
-}
diff --git a/flake.nix b/flake.nix
index 1a9c661..a8b5101 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,68 +29,73 @@
         in collectors // { default = collectors.zfs-metrics; }
       );
 
-      checks = forAllSystems (pkgs: {
-        # promtool over the recording rules. The server module also runs this at build
-        # time via services.prometheus.checkConfig, but that only fires for people who
-        # actually deploy it.
-        prometheus-rules = pkgs.runCommand "check-prometheus-rules"
-          { nativeBuildInputs = [ pkgs.prometheus.cli ]; }
-          ''
-            promtool check rules ${./rules}/*.yml
-            touch "$out"
-          '';
+      checks = forAllSystems (pkgs:
+        let
+          dashboardsForCheck = pkgs.linkFarm "dashboards" (pkgs.lib.mapAttrsToList
+            # The .json suffix matters: the check globs *.json, and a
+            # linkFarm named without it silently matches nothing.
+            (name: drv: { name = "${name}.json"; path = drv; })
+            # callPackages, not callPackage: the latter adds override/
+            # overrideDerivation attrs that are functions, not derivations.
+            (pkgs.callPackages ./modules/dashboards.nix {
+              dsUid = { prometheus = "prometheus"; loki = "loki"; };
+            }));
+        in
+        {
+          # promtool over the recording rules. The server module also runs this at build
+          # time via services.prometheus.checkConfig, but that only fires for people who
+          # actually deploy it.
+          prometheus-rules = pkgs.runCommand "check-prometheus-rules"
+            { nativeBuildInputs = [ pkgs.prometheus.cli ]; }
+            ''
+              promtool check rules ${./rules}/*.yml
+              touch "$out"
+            '';
 
-        # The dashboard JSON is generated by the scripts next to it and committed, so it
-        # can rot silently if someone edits a generator without re-running it. Regenerate
-        # here and diff.
-        dashboards-current = pkgs.runCommand "check-dashboards-current"
-          { nativeBuildInputs = [ pkgs.python3 pkgs.diffutils ]; }
-          ''
-            cp -r ${./dashboards} work
-            chmod -R u+w work
-            cd work
+          # An empty or malformed dashboard does not fail any build on its own -- it
+          # provisions fine and simply renders nothing -- so assert on the content.
+          dashboards-nonempty = pkgs.runCommand "check-dashboards-nonempty"
+            { nativeBuildInputs = [ pkgs.jq ]; }
+            ''
+              shopt -s nullglob
+              found=0
+              for f in ${dashboardsForCheck}/*.json; do
+                found=$((found + 1))
+                name=$(basename "$f")
+                [ -s "$f" ] || { echo "$name is empty"; exit 1; }
+                jq -e '.title and .uid and (.panels | length > 0)' "$f" >/dev/null \
+                  || { echo "$name has no title, uid or panels"; exit 1; }
+                echo "$name: $(jq -r '"\(.title) — \(.panels | length) panels"' "$f")"
+              done
+              # A glob that matches nothing would otherwise make this check vacuous.
+              [ "$found" -eq 4 ] || { echo "expected 4 dashboards, found $found"; exit 1; }
+              touch "$out"
+            '';
 
-            # Note the loop variable is not called "out": that is the derivation's own
-            # output path, and shadowing it makes the final touch silently write
-            # somewhere else and the build fail with "failed to produce output path".
-            check() {
-              local generator="$1" committed="$2"
-              python3 "$generator" > regenerated.json
-              if ! diff -u "$committed" regenerated.json; then
-                echo
-                echo "dashboards/$committed is stale."
-                echo "Re-run: python3 dashboards/$generator > dashboards/$committed"
-                exit 1
-              fi
-            }
-
-            check gen_smart.py smart.json
-            check gen_zfs.py zfs-pools.json
-            touch "$out"
-          '';
-
-        # Both halves have to evaluate, separately and together. Catches option typos
-        # and missing mkIf guards without needing a real machine.
-        modules-eval = (nixpkgs.lib.nixosSystem {
-          system = pkgs.stdenv.hostPlatform.system;
-          modules = [
-            self.nixosModules.default
-            ({ lib, ... }: {
-              services.telemetry.collectors.enable = true;
-              services.telemetry.server = {
-                enable = true;
-                collectorHosts = [ "one" "two" ];
-                proxy.enable = true;
-                # Never read during evaluation; only has to satisfy the assertion.
-                grafana.secretKeyFile = "/run/secrets/grafana-secret-key";
-              };
-              boot.loader.grub.devices = [ "/dev/sda" ];
-              fileSystems."/" = { device = "/dev/sda1"; fsType = "ext4"; };
-              system.stateVersion = "25.11";
-            })
-          ];
-        }).config.system.build.toplevel;
-      });
+          # Both halves have to evaluate, separately and together. Catches option typos
+          # and missing mkIf guards without needing a real machine -- and because the
+          # dashboards are generated during the build, this also runs both generators and
+          # fails if either one crashes or emits something jq cannot parse.
+          modules-eval = (nixpkgs.lib.nixosSystem {
+            system = pkgs.stdenv.hostPlatform.system;
+            modules = [
+              self.nixosModules.default
+              ({ lib, ... }: {
+                services.telemetry.collectors.enable = true;
+                services.telemetry.server = {
+                  enable = true;
+                  collectorHosts = [ "one" "two" ];
+                  proxy.enable = true;
+                  # Never read during evaluation; only has to satisfy the assertion.
+                  grafana.secretKeyFile = "/run/secrets/grafana-secret-key";
+                };
+                boot.loader.grub.devices = [ "/dev/sda" ];
+                fileSystems."/" = { device = "/dev/sda1"; fsType = "ext4"; };
+                system.stateVersion = "25.11";
+              })
+            ];
+          }).config.system.build.toplevel;
+        });
 
       devShells = forAllSystems (pkgs: {
         default = pkgs.mkShell {
diff --git a/modules/dashboards.nix b/modules/dashboards.nix
index 125e3e2..2fc24c8 100644
--- a/modules/dashboards.nix
+++ b/modules/dashboards.nix
@@ -2,7 +2,7 @@
 #
 # Returns an attrset of { name = derivation; }, where each derivation is a single
 # dashboard JSON file. modules/server.nix drops these into /etc/grafana-dashboards.
-{ lib, runCommand, fetchurl, jq, dsUid }:
+{ lib, runCommand, fetchurl, jq, python3, dsUid }:
 
 let
   # Dashboards exported from grafana.com carry an `__inputs` block and reference their
@@ -29,12 +29,23 @@ let
     | .id = null
   '';
 
+  # One jq invocation, shared by both sources of dashboards below.
+  #
+  # Deliberately a single line with no trailing newline: callers append redirections
+  # (`< $src > "$out"`), and a multi-line string would put those on a line of their own
+  # as a separate command -- which truncates $out to zero bytes and sends jq's output to
+  # the build log, without failing the build.
+  jqFixup = lib.concatStringsSep " " [
+    "jq"
+    "--arg prom ${lib.escapeShellArg dsUid.prometheus}"
+    "--arg loki ${lib.escapeShellArg dsUid.loki}"
+    (lib.escapeShellArg fixupProgram)
+  ];
+
   fixup = name: src: runCommand "grafana-dashboard-${name}.json"
     { nativeBuildInputs = [ jq ]; }
     ''
-      jq --arg prom ${lib.escapeShellArg dsUid.prometheus} \
-         --arg loki ${lib.escapeShellArg dsUid.loki} \
-         ${lib.escapeShellArg fixupProgram} < ${src} > "$out"
+      ${jqFixup} < ${src} > "$out"
     '';
 
   fromGrafanaCom = { name, id, rev, hash }:
@@ -42,6 +53,28 @@ let
       url = "https://grafana.com/api/dashboards/${toString id}/revisions/${toString rev}/download";
       inherit hash;
     });
+
+  # The generators and the panel helpers they import.
+  generators = ../dashboards;
+
+  # Our own dashboards are generated here rather than committed as JSON. The JSON is
+  # machine-written and the generator beside it is the only source of truth, so keeping
+  # both in git only creates a way for them to drift -- and a build that runs the
+  # generator cannot serve a stale dashboard. Note flakes copy only git-tracked files
+  # into the store, so committing the .json is the *only* way to also read it from disk;
+  # there is no "gitignore it and read it anyway" option.
+  fromGenerator = { name, generator }:
+    runCommand "grafana-dashboard-${name}.json"
+      {
+        nativeBuildInputs = [ jq python3 ];
+        # panels.py sits next to the generators and is imported by both of them.
+        PYTHONPATH = generators;
+        # The store path is read-only; without this Python warns about __pycache__.
+        PYTHONDONTWRITEBYTECODE = 1;
+      }
+      ''
+        python3 ${generators}/${generator} | ${jqFixup} > "$out"
+      '';
 in
 {
   # https://grafana.com/grafana/dashboards/1860
@@ -65,11 +98,10 @@ in
   # can never render against Prometheus, however it is provisioned. This is a
   # Prometheus-native replacement built on the metrics we actually export: node
   # exporter's zfs collector plus the ZFS textfile collector.
-  # Generated by dashboards/gen_zfs.py.
-  zfs-pools = fixup "zfs-pools" ../dashboards/zfs-pools.json;
+  zfs-pools = fromGenerator { name = "zfs-pools"; generator = "gen_zfs.py"; };
 
-  # CrystalDiskInfo-style per-drive SMART view. Generated by dashboards/gen_smart.py.
-  # The Good/Caution/Bad verdict and the per-drive row titles both come from the
-  # recording rules in rules/smartctl.yml, so this one needs those loaded to be useful.
-  drive-health = fixup "drive-health" ../dashboards/smart.json;
+  # CrystalDiskInfo-style per-drive SMART view. The Good/Caution/Bad verdict and the
+  # per-drive row titles both come from the recording rules in rules/smartctl.yml, so
+  # this one needs those loaded to be useful.
+  drive-health = fromGenerator { name = "drive-health"; generator = "gen_smart.py"; };
 }