53 posts in this category
Median JS error rate: 0.4% of sessions. 90th percentile: 2.8%. Sourced benchmarks so you can finally answer 'is our error rate bad?'
Appwrite's dashboard shows requests. It doesn't show why your login funnel is leaking 40% of users.
Resolver spans + N+1 detection for Apollo Server and GraphQL Yoga. Full OpenTelemetry setup.
That minified stack trace pointing to line 1, column 47293? Useless. Here's what source maps actually do—and why secure upload matters more than you think.
Your tracking pixel just got blocked by uBlock Origin. Again. Here's what happens when you move pageview collection server-side—from Beacon API mechanics to IP-to-region resolution without storing IPs.
Session replay isn't video—it's DOM serialization. Here's how it works.
How grok patterns turn raw logs into queryable fields—regex syntax and pipeline setup.
Your uptime monitor says the site is down. Cloudflare is blocking it.
Random sampling misses 90% of failures during traffic spikes. Fix it.
Speculation Rules and prefetch APIs are silently doubling your pageview counts. Here's the detection method and the fix.
React Strict Mode doubling your analytics? Here's the fix.
Your telemetry is silently failing. Here's how to fix CORS preflight issues.
The error happened. You can't reproduce it. But the session replay shows exactly what the user did—and it's one click away from the stack trace.
The browser's back-forward cache skips page loads entirely — your analytics and error tracking never fire. Here's the pagehide/pageshow fix.
RedwoodJS cells mask GraphQL failures behind loading states. Here's how to trace errors from a crashed cell render back through the resolver that caused it.
Set up unified error tracking for React Native with source maps, native crash reports, and screen-level analytics — no separate SDK required.
Track Preact errors without bloating your bundle.
When your fleet management dashboard shows 847 devices stuck mid-update, you need error context now — not after digging through four tools.
Catch JS errors, plugin failures, and WebView crashes in one dashboard for Capacitor apps.
Track WebGL context loss and GPU crashes before users see a black screen.
15% of deploys roll back. 67% happen within 30 minutes. The DORA data reveals why.
Daily-rotating salts, hashed IP+UA, and why this isn't fingerprinting under EDPB guidance. Pseudocode included.
Skip the chaos platform. One observability tool + half a day = incident readiness that actually sticks.
Your analytics already show next quarter's infra needs. Here's how to extract traffic curves, predict peaks, and right-size before you get paged.
30 browser APIs emit observability data. Most devs know maybe half. Here's the complete reference.
Skip the 200MB agent binaries. Here's how to get P95 latency, distributed tracing, and error correlation for your Express API using OpenTelemetry auto-instrumentation and a sub-5KB frontend script.
Actor mailboxes break thread-local trace context. Here's how to propagate spans across Pekko actors in a Play Framework app without losing your mind.
30 LLM observability terms defined — token accounting, evals, agent spans, guardrails. Plain English for AI ops.
Trace Symfony HTTP requests and Messenger workers with OpenTelemetry APM. Doctrine spans, queue timing, full visibility.
Add request tracing and slow-query detection to Flask apps with OpenTelemetry and JustAnalytics. Gunicorn-ready.
Wire OpenTelemetry APM into Quarkus and Micronaut apps — including GraalVM native images where the usual Java agent trick doesn't work.
How to wire distributed tracing into gRPC microservices — interceptor-based span propagation, deadline errors that actually tell you something, and streaming RPC traces that don't blow up your cardinality.
APM for .NET 8 Minimal APIs — trace slow endpoints in under an hour.
Which resolver took 2.8 of your 3-second query? Per-field APM tracing reveals all.
TanStack Start's beforeLoad and loader errors vanish into the void unless you catch them yourself. Here's the setup for route-loader failures plus pageviews in one script.
Java 21 virtual threads break APM agents. Fix your traces with OpenTelemetry.
CSP silently drops your analytics. No errors in your app, no data in your dashboard. Here's how to read the violation and fix it in under 10 minutes.
Rust APM tracing with no agent—finally, real observability.
Build a live internal dashboard with the JustAnalytics API — real code included.
Catch Vue hydration mismatches and SSR crashes before your users report them.
A silent API timeout in your flight search can bleed bookings for hours before anyone notices. Here's how to catch it.
SvelteKit load functions and form actions fail in ways generic SDKs miss. Here's how to catch them with handleError and pageview tracking in one embed.
Laravel error tracking that correlates exceptions with funnel drop-offs. Stop debugging blind.
Catch main, renderer, and native crashes in one dashboard — debug Electron apps faster.
Track crashes in extension service workers, content scripts, popups. Manifest V3 ready.
Angular error tracking with Zone.js, RxJS, and route analytics in one 5KB script.
Your app looks broken when a dependency dies. Learn to detect third-party outages with synthetic checks and error-spike correlation — minutes, not hours.
Your monitoring stack was built for normal traffic. Black Friday isn't normal.
Phoenix LiveView breaks naive APM tools. Here's the fix using Telemetry + OpenTelemetry.
A silent JS error in your checkout can bleed thousands before anyone notices. Here's how to catch it.
Build a status page from uptime data. No extra vendor, no extra bill.
A JS error can quietly cut checkout conversions. Find yours in 30 seconds.
One middleware for pageviews and errors. Celery + DRF included.