# REPORT: TASK-20260828-0737-disk-reclaim-stale-cache (P1)

Status: DONE. Approved command executed exactly as specified:
  docker builder prune -a --filter until=168h -f
No image/volume/system/container prunes run.

## df -h /
Before:  /dev/sda1  274G  208G  53G  80%  /
After:   /dev/sda1  274G  202G  59G  78%  /
Disk space freed: +6G available (53G -> 59G).

## 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     500   4   66.43GB   121.8MB 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     391   4   57.65GB   43.69GB reclaimable

Bytes reclaimed (docker-reported): 8.786GB (109 entries, all idle 8+ days;
df gain smaller due to layer sharing with tagged images).

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

## Outcome vs threshold
Free space now 59G/274G = 21.5% >= 20% bar from step 1. No follow-up
QUESTION filed.

## FYI (measured, no action taken)
Remaining Build Cache 57.65GB, of which 43.69GB is unused-but-recent (<7d,
kept by the until=168h filter); it becomes prunable as it ages, or via
`docker builder prune -a -f` at cost of cold rebuilds. Deferred option 2
(dangling images, 44.71GB) still on the table per PMO decision. Combined
ceiling if both ever approved: ~88GB.

Task archived to archive/TASK-20260828-0737-disk-reclaim-stale-cache.md