root = Card([header, status, alert, revenue<unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk> "C" for "Clear" (transparent)
   - "s" = small
   - "m" = medium
   - "l" = large
   - "xl" = extra large
   - "2xl" = extra large
   - "xs" = extra small
   - "s" = small
   - "m" = medium
   - "l" = large
   - "xl" = extra large
   - "2xl" = extra extra large

5. EVERY variable (except root) MUST be referenced by at least one other variable. Unreferenced variables are silently dropped and will NOT render. Always include defined variables in their parent's children/items array.

Let's construct the final response.

root = Card([header, stats, stats_row, stats_grid, filters, incident_list, slow_endpoints, filter_row, action_buttons], "card", "row", "m", "center", "stretch")
header = CardHeader("Health Dashboard", "Dashboard Overview")
uptime = TextContent("Uptime this quarter: 99.9%", "large")
uptime_container = Card([uptimeText], "sunk")
cpu_memory_series = [
    Series("CPU", [10, 12, 15, 14, 13, 16, 18, 20, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8]),
    "Memory", [30, 32, 28, 27, 29, 31, 33, 35, 34, 32, 30, 28, 27, 26, 25, 24, 23, 22, 19, 18, 18, 17, 16]
]
cpu_memory_chart = LineChart(
    ["0", "1", "2", "4", "6", "6", "7", "8", "9", "10", "11", "11", "12", "13", "14", "14", "14", "13", "13", "12", "13", "13", "6", "7", "4"],
    [cpuSeries, memorySeries],
    "natural",
    "Hour",
    "Usage (%)"
)
incidents = ListBlock([
    "Database connection timeout (Critical)",
    "API rate limit exceeded (Warning)",
    "Memory leak detected (Info)"
]
)
region_filter = Select(
    "region_filter",
    [
        "SelectItem('All', 'All')",
        SelectItem("us-east", "US East"),
        SelectItem("eu-west", "EU West"),
        SelectItem("ap-southeast", "AP Southeast")
    ],
    "Select region<unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk>

root = Card([header, uptimeText, cpuMemoryChart, errorRateText, incidentsList, regionSelect, slowEndpointsTable, alertSlider, acknowledgeBtn])