v.21.1Improvements

Incremental Profile Events Counters for ClickHouse Replicas

Official CH changelog text
Now every replica will send to client only incremental information about profile events counters. #31155 (Dmitry Novik). This makes --hardware_utilization option in clickhouse-client usable.
Replica nodes in ClickHouse now send only incremental updates for profile events counters to clients.

Why it matters

This feature improves the efficiency and usability of monitoring hardware utilization by reducing redundant data transmission. It specifically enables the --hardware_utilization option in clickhouse-client to work properly, providing more accurate and up-to-date hardware usage statistics.

How to use it

Use the --hardware_utilization option when running clickhouse-client to get incremental hardware utilization data from replicas.

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