Use this skill to monitor and verify a deployed URL after releases — checks HTTP endpoints, SSE streams, static assets, console errors, and performance regressions after deploys, merges, or dependency upgrades. Smoke / canary / post-deploy verification.
Installation
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Use this skill to monitor and verify a deployed URL after releases — checks HTTP endpoints, SSE streams, static assets, console errors, and performance regressions after deploys, merges, or dependency upgrades. Smoke / canary / post-deploy verification.
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Multiversal
Canary Watch — Post-Deploy Monitoring
When to Use
After deploying to production or staging
After merging a risky PR
When you want to verify a fix actually fixed it
Continuous monitoring during a launch window
After dependency upgrades
How It Works
Monitors a deployed URL for regressions. Runs in a loop until stopped or until the watch window expires.
What It Watches
1. HTTP Status — is the page returning 200?
2. Console Errors — new errors that weren't there before?
3. Network Failures — failed API calls, 5xx responses?
4. Performance — LCP/CLS/INP regression vs baseline?
5. Content — did key elements disappear? (h1, nav, footer, CTA)
6. API Health — are critical endpoints responding within SLA?
7. Static Assets — are JS, CSS, image, and font requests returning 2xx/3xx with expected content types?
8. SSE Streams — do event-stream endpoints connect and receive an initial event or heartbeat?
Watch Modes
Quick check (default): single pass, report results
/canary-watch https://myapp.com
Sustained watch: check every N minutes for M hours
critical:# immediate alert-HTTPstatus!=200-Consoleerrorcount>5(newerrorsonly)-LCP>4s-APIendpointreturns5xx-Staticassetreturns4xx/5xx-SSEendpointcannotconnectordropsbeforefirstheartbeatwarning:# flag in report-LCPincreased>500msfrombaseline-CLS>0.1-Newconsolewarnings-Responsetime>2xbaseline-Staticassetcontenttypechangedunexpectedly-SSEheartbeatlatency>2xbaselineinfo:# log only-Minorperformancevariance-Newnetworkrequests(third-partyscriptsadded?)
