resolve disk selection persistence and validation issues

docs/infrastructure-disk-selection.md

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+# Infrastructure Monitoring - Disk Selection
+
+This guide explains how to use the selective disk monitoring feature in Checkmate's infrastructure monitoring.
+
+## Overview
+
+By default, Checkmate monitors all detected disks on your server. The disk selection feature allows you to choose specific disks/mountpoints to monitor, giving you more control over what gets tracked and displayed.
+
+## Prerequisites
+
+- Checkmate server running with [Capture agent](https://github.com/bluewave-labs/capture) installed on target server
+- An existing infrastructure monitor already created and configured
+- At least one disk detected by the Capture agent
+
+## Using Disk Selection
+
+### Accessing the Feature
+
+1. Navigate to your Infrastructure monitors page
+2. Click on an existing infrastructure monitor to view details
+3. Click the "Configure" or "Edit" button
+4. Scroll down to the **Disk Selection** section
+
+> **Note:** The disk selection feature is only available when editing existing monitors that have already detected disks.
+
+### Selecting Disks to Monitor
+
+1. **View Available Disks**: The system automatically detects all disks/mountpoints from your server
+2. **Select Disks**: Check the boxes next to the disks you want to monitor
+3. **Apply Changes**: Click "Save" to update your monitor configuration
+
+### Understanding Disk Identifiers
+
+Disks are identified by their mountpoint or device name:
+- **Mountpoint**: `/` (root), `/home`, `/var`, etc.
+- **Device**: `/dev/sda1`, `/dev/nvme0n1p1`, etc.
+
+### Behavior
+
+- **All disks selected**: Shows all detected disks in gauges and charts
+- **Specific disks selected**: Only shows selected disks in the monitoring interface
+- **No disks detected**: Displays "No disk detected for the moment" message
+
+## What Gets Filtered
+
+When you select specific disks, the following elements are filtered:
+
+- **Disk Usage Gauges**: Only selected disks appear in the dashboard
+- **Disk Usage Charts**: Time-series charts show only selected disks
+- **Monitor Table**: Summary view reflects only selected disk usage
+
+## Example Use Cases
+
+- **Server with multiple drives**: Monitor only critical system disks, ignore temporary storage
+- **Database servers**: Focus monitoring on database partition while ignoring logs partition
+- **Web servers**: Monitor web content disk separately from system disk
+- **Development environments**: Track only project-specific mountpoints
+
+## Troubleshooting
+
+### No Disks Appearing
+- Verify the Capture agent is running on the target server
+- Check that the agent has proper permissions to read disk information
+- Ensure the monitor has been running long enough to collect at least one check
+
+### Missing Disk Information
+- Some disks may not be accessible to the Capture agent due to permissions
+- Virtual or network-mounted disks may not appear in the list
+- Check the Capture agent logs for any disk detection errors
+
+## Related Documentation
+
+- [Infrastructure Monitoring Setup](https://docs.checkmate.so/checkmate-2.1)
+- [Capture Agent Installation](https://github.com/bluewave-labs/capture)