[workflow-health] Metrics Collector failing — ENOENT: /tmp/gh-aw/aw_info.json

[github-actions]

The Metrics Collector workflow has begun failing in the activation job with an unexpected infrastructure error. This is a regression from its previously stable state (5+ consecutive successes as of 2026-02-25).

Error Details

Workflow: Metrics Collector - Infrastructure Agent
Run: §22526204448 (run #73, 2026-02-28T18:13)
Job: activation
Error:

Error: ENOENT: no such file or directory, open '/tmp/gh-aw/aw_info.json'
    at Object.writeFileSync (node:fs:2415:20)
    at eval (eval at callAsyncFunction ...
```

### Root Cause Analysis

The `activation` job fails when `generateWorkflowOverview(core)` tries to write `/tmp/gh-aw/aw_info.json`. This file is created by the `gh-aw setup` action as part of initialization. The error indicates `/tmp/gh-aw/` directory did not exist when the activation job ran.

Possible causes:
1. **Transient runner failure**: The setup step may have failed silently and the directory was never created
2. **Setup action regression**: A recent change to the setup action may have broken directory creation
3. **Race condition**: The setup step may complete but not have created the expected path

### Impact

- Metrics Collector is our infrastructure agent — it provides daily metrics for other meta-orchestrators (Campaign Manager, Agent Performance Analyzer, Workflow Health Manager)
- Failure of this workflow degrades shared memory quality and trend analysis
- Without fresh metrics, health monitoring relies on stale data

### Suggested Fix

1. Check recent changes to `actions/setup` and the `generate_workflow_overview.cjs` script
2. Verify the setup action properly creates `/tmp/gh-aw/` before the activation job runs
3. Add explicit directory creation guard (`mkdir -p /tmp/gh-aw`) in setup if missing

### Debugging

```
/agent agentic-workflows debug the agentic workflow metrics-collector failure in https://github.com/github/gh-aw/actions/runs/22526204448

Detected by: Workflow Health Manager, run §22538460268

Generated by Workflow Health Manager - Meta-Orchestrator

• expires on Mar 2, 2026, 7:28 AM UTC