# REPORT: TASK-20260828-0722-engstack-disk-reclaim (P1)

Status: DONE (dangling build cache pruned; follow-up QUESTION filed, see below).

Command run: docker builder prune -f  (dangling only; no -a, no system/image/
volume prune; no containers touched)

## df -h /
Before:
  /dev/sda1  274G  247G  14G  95%  /
After:
  /dev/sda1  274G  208G  53G  80%  /

Disk space freed: +39G available (14G -> 53G).

## docker system df
Before:
  Images          128  32  108.2GB   44.71GB (41%) reclaimable
  Containers       36  26   638.3MB  296.1MB (46%) reclaimable
  Local Volumes    31  25   1.491GB   1.139GB (76%) reclaimable
  Build Cache     868   4  109GB     42.7GB reclaimable
After:
  Images          128  32  108.2GB   44.71GB (41%) reclaimable
  Containers       36  26   638.3MB  296.1MB (46%) reclaimable
  Local Volumes    31  25   1.491GB   1.139GB (76%) reclaimable
  Build Cache     500   4   66.43GB   121.8MB reclaimable

Bytes reclaimed (docker-reported): 42.58GB build cache (868 -> 500 entries).
Note: build-cache delta 109GB -> 66.43GB = 42.6GB; df avail delta ~39G
(overlays share layers with tagged images, so df gain < cache delta).

## Safety checks
- Running containers before: 26; after: 26. None stopped/removed.
- Images/volumes/containers untouched (counts identical).

## Constraint check
Free space after = 53G / 274G = 19.3% < 20% threshold.
Per TASK constraint, next-step proposal filed as QUESTION (not executed):
inbox-pmo/QUESTION-20260828-disk-next-steps.md

Task archived to archive/TASK-20260828-0722-engstack-disk-reclaim.md