v.24.10Improvement

Add Profile Event for Merged Source Parts Monitoring

Official CH changelog text
Add a profile event about the number of merged source parts. It allows the monitoring of the fanout of the merge tree in production. #70908 (Alexey Milovidov).
Introduces a new profile event that tracks the number of merged source parts in MergeTree tables.

Why it matters

This feature enables monitoring of the fanout behavior during merges in MergeTree engines, helping users understand and optimize merge operations and system performance in production environments.

How to use it

Users can access the new profile event via system profiling tools or logs to observe the count of source parts merged during background merges. No special configuration is required as the event is integrated into existing profiling mechanisms.

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