Canary

Post-deploy regression monitor: captures a pre-deploy baseline, then watches live production and alerts only on changes from that baseline — not on absolute values.

Purpose

Detect production regressions introduced by a deployment by continuously comparing the live app against a pre-deploy baseline, firing alerts only when something changes, which minimizes false positives while catching real issues.

Trigger

Apply when user requests:

• "canary", "post-deploy monitor", "monitor after deploy", "watch production"
• "check for regressions", "canary check", "部署後監控", "上線後巡邏"
• "keep watching the site after I ship"

Do NOT trigger for:

• Pre-deploy testing — use qa or webapp-testing
• General performance auditing — use benchmark
• One-time health check without ongoing monitoring — use webapp-testing