Summary

Investigating issue #23865: the push_repo_memory job failed with a "Patch Size Exceeded" error for the daily-copilot-token-report workflow.

Root Cause Analysis

Patch computation: ✅ Fixed — The original implementation used the full git diff --cached output (additions + deletions) to measure patch size. This was incorrect: a workflow that rewrites a large accumulated history file (e.g. 35 KB of old content → 9.8 KB new content) would be charged ~45 KB against the limit, even though only 9.8 KB of new content is actually being pushed.

Correct behavior: Only additions (new content) should count toward the patch size limit. Deletions are acceptable and do not contribute to the size of content being pushed.

The configured max-patch-size default (10 KB) was also too small for accumulating-history workflows.

The Logging Bug

The logging was also insufficient to diagnose this:

1. The patch size line was core.info — invisible in GitHub Actions default output (only shown in verbose/debug mode)
2. No per-file breakdown was provided, making it impossible to tell if it was a single large file or many small files

Changes Made

actions/setup/js/push_repo_memory.cjs

• Additions-only patch size: Patch size is now computed by counting only added lines (+ lines, excluding +++ file-header lines) from git diff --cached. Deletions are fully ignored.
• Warning level when patch additions size exceeds the configured limit (including within the 20% overhead window)
• git diff --cached --stat output emitted as core.warning on failure, showing per-file line additions/deletions
• Messages updated to say "Patch additions size" for clarity

Expected Log Output After Fix

##[warning]Patch additions size: 9 KB (9800 bytes) (configured limit: 10 KB (10240 bytes), effective with 20% overhead: 12 KB (12288 bytes))
##[warning]Patch content breakdown (git diff --stat):
 memory/token-metrics/history.jsonl | 435 ++++++++++------------------------
 1 file changed, 87 insertions(+), 348 deletions(-)

Only the 9.8 KB of new additions counts against the limit — the 35 KB of deletions is ignored.

References

• Issue: [aw] Daily Copilot Token Consumption Report failed #23865
• Failed run: https://github.com/github/gh-aw/actions/runs/23846022060
• Job: push_repo_memory

🎩 Equipped by Q · ◷

• expires on Apr 3, 2026, 11:58 AM UTC