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Summary

Added documentation clarifying zstd compression level mapping and zstd:chunked support limitations.

Changes

  • Added "Zstd compression levels" subsection explaining that BuildKit maps compression-level values 0-22 to only 4 internal compression levels
  • Added table showing the mapping: 0-2 (Fastest), 3-6 (Default), 7-8 (Better), 9-22 (Best)
  • Added "Zstd chunked compression" subsection clarifying that BuildKit doesn't support the chunked optimization features

Fixes #23757


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@dvdksn dvdksn closed this Feb 10, 2026
@dvdksn dvdksn reopened this Feb 10, 2026
@github-actions github-actions bot added the area/build Relates to Dockerfiles or docker build command label Feb 10, 2026
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dvdksn commented Feb 10, 2026

/review

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Documentation Review

Found 1 style issue in the added content related to timeless writing.

The new content explaining zstd compression levels and chunked compression is clear and informative. The table effectively shows how compression-level values map to internal levels, and the explanation of chunked compression limitations is helpful for users.

This change was automatically generated by the documentation agent team
in response to issue #23757.

🤖 Generated with cagent

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
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zstd compression-level should cover level mapping

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