It looks like the process has no CAP_NET_ADMIN capability, 'taskstats' performance statistics will be disabled. It could happen due to incorrect ClickHouse package installation. You could resolve the problem manually with 'sudo setcap cap_net_admin=+ep /usr/bin/clickhouse'. Note that it will not work on 'nosuid' mounted filesystems. It also doesn't work if you run clickhouse-server inside network namespace as it happens in some containers.
что это ? зачем нужна такая статистика
Для профилирования работы КХ.
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