{
  "uid": "scrabble-users",
  "title": "Scrabble — Users",
  "tags": ["scrabble"],
  "timezone": "",
  "schemaVersion": 39,
  "version": 2,
  "refresh": "30s",
  "time": { "from": "now-7d", "to": "now" },
  "panels": [
    {
      "type": "timeseries",
      "title": "Active users (in-memory, single gateway)",
      "description": "Distinct accounts with an authenticated action within the window. Resets on gateway restart; correct for a single instance (MVP).",
      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 0 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [{ "refId": "A", "expr": "max(active_users) by (window)", "legendFormat": "{{window}}" }]
    },
    {
      "type": "timeseries",
      "title": "New accounts (rate by kind)",
      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 0 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [{ "refId": "A", "expr": "sum(rate(accounts_created_total[1h])) by (kind)", "legendFormat": "{{kind}}" }]
    },
    {
      "type": "timeseries",
      "title": "New accounts (cumulative by kind)",
      "gridPos": { "h": 8, "w": 24, "x": 0, "y": 8 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [{ "refId": "A", "expr": "sum(accounts_created_total) by (kind)", "legendFormat": "{{kind}}" }]
    },
    {
      "type": "timeseries",
      "title": "App opens vs dictionary fills (cumulative)",
      "description": "Local move-preview adoption. App opens are client cold starts; dictionary fills are IndexedDB downloads of a dawg. The gap between them is how many launches reuse an already-cached dictionary. Client-reported, best-effort (a batched beacon), so slightly lossy.",
      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 16 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [
        { "refId": "A", "expr": "sum(local_eval_cold_start_total)", "legendFormat": "app opens (cold start)" },
        { "refId": "B", "expr": "sum(local_eval_dict_load_total{result=\"fetched\"})", "legendFormat": "dictionary fills (IndexedDB)" }
      ]
    },
    {
      "type": "timeseries",
      "title": "Dictionary loads by result (rate)",
      "description": "Client dictionary loads for the local preview, by tier: fetched (network download), cache_hit (IndexedDB), miss (a warm-up that failed or timed out — trips the bad-connection breaker).",
      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 16 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [{ "refId": "A", "expr": "sum(rate(local_eval_dict_load_total[1h])) by (result)", "legendFormat": "{{result}}" }]
    },
    {
      "type": "timeseries",
      "title": "Move previews by path (rate)",
      "description": "Where the move preview is computed: local (on-device, the accelerator) vs network (the fallback to game.evaluate). The local share is the backend load shed.",
      "gridPos": { "h": 8, "w": 24, "x": 0, "y": 24 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [{ "refId": "A", "expr": "sum(rate(local_eval_preview_total[1h])) by (path)", "legendFormat": "{{path}}" }]
    },
    {
      "type": "timeseries",
      "title": "Unsupported-engine screens (cumulative by reason)",
      "description": "Clients turned away by the index.html boot guard because the engine cannot run the app (an old Android System WebView), by reason: no_bigint / no_proxy (a missing unpolyfillable primitive) or boot_error (an uncaught startup failure). Deduped per device/version, so this counts distinct blocked installs, not launches. The effective floor is Chrome 67 (BigInt).",
      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 32 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [{ "refId": "A", "expr": "sum(unsupported_engine_total) by (reason)", "legendFormat": "{{reason}}" }]
    },
    {
      "type": "timeseries",
      "title": "Unsupported engines by Chromium (rate)",
      "description": "The same blocked clients by reported Chromium major version — which old in-app WebViews are still in the wild. \"other\" is an unparseable or out-of-range version.",
      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 32 },
      "datasource": { "type": "prometheus", "uid": "prometheus" },
      "targets": [{ "refId": "A", "expr": "sum(rate(unsupported_engine_total[1h])) by (chromium)", "legendFormat": "Chromium {{chromium}}" }]
    }
  ]
}