v.23.11Improvement

Fix DNS Configuration and Enhance HTTP Keep-Alive Timeout

Official CH changelog text
The value for dns_max_consecutive_failures was changed by mistake in #46550 - this is reverted and adjusted to a better value. Also, increased the HTTP keep-alive timeout to a reasonable value from production. #56485 (Alexey Milovidov).
Reverted and adjusted the dns_max_consecutive_failures setting to a better value and increased the HTTP keep-alive timeout to a more reasonable duration based on production experience.

Why it matters

The update fixes an unintended change to the dns_max_consecutive_failures parameter introduced in a previous issue, improving stability by setting it to a proper value. Additionally, increasing the HTTP keep-alive timeout enhances connection reuse efficiency, which improves performance and resource utilization in production environments.

How to use it

The changes are applied as default configuration adjustments within ClickHouse. Users benefit from the improved settings automatically with this version without manual intervention.

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