v.25.6Improvement

Metrics for number of readonly and broken

Metrics for number of readonly and broken disks. Indicator logs when DiskLocalCheckThread is started. #80391 (VicoWu).
Adds metrics for tracking the number of readonly and broken disks, and an indicator log for when DiskLocalCheckThread starts.

Why it matters

This feature helps monitor the health and status of local disks used by ClickHouse by providing metrics on readonly and broken disks, improving visibility for administrators to detect and address disk issues promptly.

How to use it

The metrics are collected automatically once the DiskLocalCheckThread is running, and logs are generated each time this thread starts. Users can monitor these metrics via the system's monitoring tools without additional configuration.