feat: add zeabur-service-metric skill for performance diagnostics

[eliajhmauve]

Summary

• Adds new zeabur-service-metric skill covering service metric CPU/MEMORY/NETWORK
• Includes a diagnostic workflow that teaches the AI to check metrics before restarting
• Decision table maps symptoms (high CPU, memory climb, network spikes) to likely causes and actions

Why this skill?

When users report "my service is slow", the AI currently has no way to check resource usage — it just suggests restarting. This skill gives the AI a proper diagnostic path: check metrics → identify bottleneck → take appropriate action.

Test plan

• Verified service metric CPU/MEMORY/NETWORK --id <id> -i=false returns data on a live service
• Verified --hour flag for custom time windows
• Followed existing skill conventions (see zeabur-restart for reference)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f97e27ab-2823-4d77-b86c-9d61b48015dc

📥 Commits

Reviewing files that changed from the base of the PR and between 0169857 and 18bd883.

📒 Files selected for processing (1)

• skills/zeabur-service-metric/SKILL.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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