v.22.8Improvement

Add FilesystemCacheSize and FilesystemCacheElements Metrics

Official CH changelog text
Add metrics for filesystem cache: FilesystemCacheSize and FilesystemCacheElements. #40260 (Kseniia Sumarokova).
Added new metrics FilesystemCacheSize and FilesystemCacheElements to monitor the filesystem cache usage in ClickHouse.

Why it matters

These metrics allow users to track the size and number of elements in the filesystem cache, providing better visibility into cache utilization and helping optimize performance and resource management.

How to use it

Users can access the new metrics FilesystemCacheSize and FilesystemCacheElements via the existing monitoring interfaces or system tables to monitor filesystem cache status and usage.

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