Problem

When collectors are failing, the Lite status bar shows a count ("Collectors: 1 erroring") with a tooltip containing the failing collector names and error messages. But this tooltip is easy to miss and hard to read for multiple failures.

The backend infrastructure already exists:

• collection_log DuckDB table stores every collector run with status, error messages, and timing
• LocalDataService.GetCollectionHealthAsync() computes per-collector health status (HEALTHY / WARNING / STALE / FAILING / NEVER_RUN), failure rates, and average durations
• CollectorHealthRow model has all the fields needed for display

But nothing in the UI calls GetCollectionHealthAsync() — the data is collected and computed but never shown.

Proposed Solution

Add a "Collection Health" tab or panel in the ServerTab that displays a DataGrid with:

This would make it immediately obvious which collectors are healthy and which need attention, without hovering over a status bar tooltip.

Related Files

• Lite/Services/LocalDataService.CollectionHealth.cs — GetCollectionHealthAsync() (line 21), CollectorHealthRow model (line 66)
• Lite/Services/RemoteCollectorService.cs — CollectorHealthEntry (line 32), RecordCollectorResult() (line 156)
• Lite/MainWindow.xaml.cs — UpdateCollectorHealth() (line 287) — current tooltip-only display
• Lite/Database/Schema.cs — collection_log table schema (line 37)