APIWatch: Checking API Traffic and Subscription Controls with WSO2 API Manager
I recently worked on a project called APIWatch using Python and WSO2 API Manager. It is a small monitoring tool that reads API traffic logs and help…
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A 200 response and a broken page: what screenshot monitoring taught me
An uptime check answers one question: did the server respond? Visitors ask a different one: can I use this page? After a few years of looking after…
Marketplace Health Endpoint Monitoring — 2 Small SaaS Observability Stack Boundaries
TL;DR: A small marketplace needs two evidence paths: internal telemetry that explains a failed scheduled job, and an external check that notices pub…
RAG Evaluation & Monitoring: Metrics, Frameworks & Production Observability
RAG Evaluation & Monitoring: Metrics, Frameworks & Production Observability Comprehensive guide to evaluating and monitoring Retrieval-Augme…
Node.js Monitoring for 3 Cron Job Silent Failure Signals
A cohort experiment cannot be rolled back safely if its scheduled evaluator can disappear without evidence. App logs alone are insufficient because…
Google says on-call needs eight engineers. You have three.
TL;DR. Google's SRE book works out that a 24/7 on-call rotation needs at least eight engineers. A team of two or three cannot reach that number, so…
Better Uptime Monitoring for Small SaaS API and Cron Healthchecks
Short answer: monitor the public API and the scheduled import as two different promises. Use an external request check for reachability, and emit a…
How Accurate Is Your Model Right Now? Estimating Accuracy Without Labels
Label-free accuracy estimation under data shift — and the monitoring sidecar that uses it. Scope note: two intent-classification datasets (Banking77…
Small SaaS Node Uptime Monitoring 2026: Cost Attribution for Health Endpoints
TL;DR: For a small fintech SaaS, start with one external probe in each customer region, one dead-man signal per scheduled job, and narrowly scoped a…
Production Health Check Endpoints: Readiness and Logs Beat External Polling Alone
An Express production health check endpoint cannot tell me that a scheduled media import produced zero articles, even when its readiness response is…
Application Uptime Monitoring: Health Endpoint Checks, Cron Job Heartbeats, and Metrics
TL;DR: Expose a cheap /health endpoint for process readiness, poll it from outside the service, and report outcome and latency metrics on a schedule…
Sentinel: The Watchdog and Derived Points
A door sensor that only reports when the door opens or closes can go months without sending anything. If nothing has happened, that silence is corre…
Backend Uptime Alerts from One-Minute Metrics API Polling and Failure Evidence
A one-minute poller is only useful if it preserves enough evidence to explain an outage after the alert fires. For a gaming backend, the practical c…
The Monitor That Only Passed When It Won a Race
A browser monitor I was migrating failed about two runs in every three. The rest passed cleanly. The application behind it was healthy. Nobody could…
Monitor your robots.txt and sitemap for accidental changes
Two SEO accidents come up again and again: A staging robots.txt with Disallow: / gets deployed to production. A migration or plugin update changes t…
How to get notified when a web page changes (without writing a scraper)
You want to know when a page changes: a "registration opens soon" notice, a competitor's pricing table, a changelog with no RSS, a government page t…
SRE for Modern Teams: A Simple Guide to Reliability, Monitoring, and Automation
Introduction Imagine opening an app and seeing an error every time you try to use it. You would probably stop using that app. People expect digital…
My green light told the truth and still warned me
A tool I run at home answers one question: does my phone have a working network right now? It prints one line. For most of a day that line read: ONL…
What Is RobotOps? A Practical Guide to Managing Robots in Production
Introduction Building a robot is only the beginning of a robotics project. Once that robot enters a factory, warehouse, hospital, or another real en…
Four Identical Red Runs: One Was Our Watchdog Working, Three Were Its Corpse
A cron in one of our repositories stopped firing on 21 June and nobody noticed for ten weeks. Its only job was to rebuild this site each morning so…
10-Minute Game Failure Alerting with Node.js Cron Log Polling Error APIs and Webhooks
Use a scheduled Node.js worker to poll error groups and logs, apply a failure threshold, and route the resulting alert to Slack, email, or a webhook…
Four Alerts That Could Never Fire, and How We Found Them
We spent a week auditing our own alerting, and the useful question turned out not to be "is anything alerting?" It was "would this alert look any di…
Close the Migration-Visibility Gap: SMS Alerts for Failed SQL Migrations in 280 Lines of Python
The first time a database migration broke on me in production, I found out from a user. Not from a dashboard, not from a Slack alert, not from anyth…
How I Built End To End Observability Stack with OpenTelemetry, Prometheus, Grafana, Loki, and Jaeger
When an application is running, knowing that it is up does not necessarily mean knowing what it is doing. For example, imagine an API request that t…
Мы тонули в алертах и не видели настоящий пожар
Был период, когда наш дежурный канал в мессенджере выдавал под триста алертов в сутки. Звучит как отличный мониторинг, а на деле это была катастрофа…
Ecommerce Conversion Rate Drop — A 60-Minute Diagnostic Playbook
Ecommerce Conversion Rate Drop: A 60-Minute Diagnostic Playbook When ecommerce orders fall, first confirm the decline and identify the earliest funn…
Three things I got wrong building an n8n monitor
I run a handful of n8n workflows unattended. A few weeks ago I noticed one had been finishing successfully for days while producing nothing at all,…
How My Own Script Killed Instagram Sessions Every Night: pkill and a Shared Chrome Profile
I built a fleet of 171 automation jobs to grow my business — and one of them was quietly murdering another one's login session every single night fo…
OCI Monitoring Alarms: Six Ways an Alarm Can Look Ready and Still Fail
A practical review of metric timing, query scope, notification delivery, suppression, and operator response While reviewing Oracle's alarm documenta…
My scanner reported honest coverage every day, and it was the same coverage every day
I have a tool whose whole job is catching tools that lie. The idea is small. A lot of my scripts have a --test mode, and a --test is supposed to be…