Your APM is Blind to Browser Deprecations
Chrome ships a new version every 4 weeks. Deprecated APIs get removed. Your monitoring tools see JavaScript errors — but they're blind to browser-native deprecation warnings, interventions, and crashes. Get months of warning before breaking changes hit production.
The Situation
Your Code Runs in an Environment You Don't Control
Modern web applications depend on browser APIs that evolve constantly. Chrome ships a new stable version every 4 weeks. Firefox and Safari follow their own deprecation schedules. Your frontend code runs across dozens of browser versions — each with different feature support and different deprecation timelines.
When Chrome deprecates an API your code depends on,
there's typically 4-12 months of warning before removal. The browser logs a deprecation warning to the DevTools
console, complete with an anticipatedRemoval date. But you're not watching the console in production
— and neither are your users.
Third-party scripts compound the problem. Your analytics, ads, chat widgets, and A/B testing tools update independently. They may start using deprecated APIs without your knowledge — or they may already be using them, silently accumulating technical debt.
The Complication
Your Monitoring Tools Are Blind to Browser-Native Events
Traditional RUM tools like Sentry, Datadog, and New Relic track JavaScript errors, performance metrics, and user sessions. But they share a fundamental blind spot: they cannot see browser-native events that occur outside of JavaScript's reach.
Deprecation warnings are logged to the console — but window.onerror doesn't fire for warnings
generated by the browser itself. Browser interventions remove content silently — Chrome's Heavy Ad Intervention
unloads ad frames without throwing any JavaScript error. Tab crashes escape JavaScript entirely — when the
browser crashes, your error tracking code stops executing before it can report.
The result: your dashboards are green while users experience broken functionality. A deprecated API might work perfectly in your development Chrome version but fail in newer versions your users are running. One company lost $50,000 in revenue from an unnoticed API issue that ran for three weeks before anyone noticed.
You learn about deprecations from customer complaints—not proactive alerts.
The Blind Spots
What Your Error Tracking Can't See
Browser-native events that escape JavaScript monitoring entirely.
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Deprecation Warnings
- Browser deprecation warnings appear in DevTools but aren't accessible to JavaScript. Your RUM tool never sees them — even when they signal an API removal in 4 months.
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Browser Interventions
- Chrome blocks heavy ads, autoplay videos, and resource-intensive scripts without throwing errors. 0.3% of ads use 27% of network bandwidth — Chrome removes them silently.
-
Tab Crashes
- When a browser tab crashes, JavaScript stops executing. Your error tracking can't report what it can't run. Tab crashes — especially out-of-memory errors — escape entirely.
-
COOP/COEP Failures
- Cross-Origin Isolation breaks OAuth popups and payment flows —
without JavaScript errors.
window.openerbecomes null and your authentication just... stops working.
The Solution
Browser-Native Reporting Without Another SDK
The W3C Reporting API turns browsers into observability sensors. We capture the reports and route them to your existing tools.
-
Proactive Deprecation Alerts
- Deprecation reports include the
anticipatedRemovaldate — the exact day the browser version without that API will ship. Prioritize fixes based on real removal timelines, not guesswork. -
Intervention Monitoring
- See when browsers block heavy ads, autoplay media, or throttle background tabs. Know which ad creatives exceed thresholds before they affect revenue.
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Cross-Origin Isolation Visibility
- Deploy COOP/ COEP with confidence. Report-only mode shows what will break before you enforce — including OAuth popups and payment integrations.
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Zero Performance Overhead
- No JavaScript SDK. No bundle size impact. Just HTTP headers. The browser handles reporting asynchronously — your users never notice.
Report Types
Browser Events Your Server Never Sees
The W3C Reporting API captures multiple report types relevant to frontend engineering.
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Deprecations
- Deprecated API usage with removal dates, source files, and line numbers. Learn more
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Interventions
- Heavy ads blocked, autoplay prevented, scripts throttled — with attribution to the source. Learn more
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Cross-Origin Isolation
- COOP/ COEP violations that break popups and cross-origin resources. Learn more
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Crash Reports
- Tab crashes and out-of-memory errors that JavaScript error tracking can't capture. Learn more
Stop Learning About Deprecations from Customer Complaints
Get proactive alerts when browsers deprecate APIs your code depends on. Route to Slack, PagerDuty, or your existing tools — no new dashboard to monitor.