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docs: correct DOCKER_MIGRATE_SNAPSHOTTER_THRESHOLD description - #25987

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Miwist:fix/migrate-snapshotter-threshold-docs
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docs: correct DOCKER_MIGRATE_SNAPSHOTTER_THRESHOLD description#25987
Miwist wants to merge 1 commit into
docker:mainfrom
Miwist:fix/migrate-snapshotter-threshold-docs

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@Miwist

@Miwist Miwist commented Sep 1, 2026

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Summary

Fixes #25914

The DOCKER_MIGRATE_SNAPSHOTTER_THRESHOLD environment variable is parsed as a human-readable size and compared against the total layer sizes of all images, not the image count.

This PR updates the automatic migration docs to describe the threshold correctly and changes the example from 5 to 200M.

Test plan

  • Verified wording against moby/moby daemon migration logic
  • Confirmed example matches integration test usage in upstream engine code

@Miwist
Miwist requested a review from dvdksn as a code owner September 1, 2026 11:00
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@github-actions github-actions Bot added area/engine Issue affects Docker engine/daemon area/storage Relates to storage, volumes labels Sep 1, 2026
The threshold is a human-readable total image layer size, not an image
count. Update the example and explanation accordingly.

Fixes docker#25914
@Miwist
Miwist force-pushed the fix/migrate-snapshotter-threshold-docs branch from 83b1c0a to 3c117d8 Compare September 1, 2026 11:02
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area/engine Issue affects Docker engine/daemon area/storage Relates to storage, volumes

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Successfully merging this pull request may close these issues.

DOCKER_MIGRATE_SNAPSHOTTER_THRESHOLD is documented as an image count, but it's actually a byte-size threshold

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