Category: Knowledge
-
React Error Monitoring: A Practical Guide to Catching, Debugging, and Fixing Production Errors
React error monitoring only works if you can see the errors your error boundaries hide. Most production failures in a React app never reach a dashboard. They happen inside event handlers, async code, and promise rejections that boundaries were never built to catch. Middleware RUM captures those errors as they happen, unminifies the stack, and…
-
Application Dependency Mapping (ADM): A Practical Guide
Application dependency mapping is the process of identifying and visualizing how the services, infrastructure, and external systems that make up an application depend on one another. It shows which components a request touches, in what order, and where a failure in one component can affect others. Teams use it for incident investigation, change impact analysis…
-
Why Observability Migrations Fail (and What Developers Can Do About It)
Observability migrations rarely fail because the new platform is worse. They fail in the gap between the pitch deck and week three, when a missing label breaks a 2 AM alert and nobody can say whether it’s the platform or the data. This guide breaks down the five patterns that quietly sink migrations, and what…
-
AWS Lambda Limits: The Complete Guide to Quotas, Hard Limits, and Workarounds
AWS Lambda enforces more than a dozen limits at once. Most teams only discover the one that matters after a function fails in production. Some of these limits are hard ceilings that AWS will never raise. Others are soft quotas that scale automatically or on request. This guide covers every current Lambda quota in one…
-
Sentry Pricing 2026: Full Cost Breakdown by Plan & Team Size
Sentry bills differently than most observability platforms: instead of metering data volume, it meters events, errors, spans, replays, logs, and attachments each with its own quota and its own overage rate. Overages on the Team plan run from $0.0003625 per error in the 50k–100k tier down to $0.0001500 per error at 20M+ events, while Business…
-
AWS Lambda CloudFormation: How to Create, Deploy, and Manage Lambda Functions
AWS Lambda runs your function code, while AWS CloudFormation defines and manages the function and its related resources, including IAM roles, triggers, and environment variables. This guide explains how to create, deploy, update, troubleshoot, and monitor a Lambda function with CloudFormation. See your Lambda functions the moment they deploy Get invocations, errors, and cold starts…
-
Middleware Expands Subscription Options With Google Marketplace Availability
Middleware is now available on Google Cloud Marketplace, giving Google Cloud customers a new way to subscribe: directly from your GCP console, billed through your existing Google Cloud invoice, with eligible spend counting toward your committed Google Cloud spend. Deployment doesn’t change. It’s the same OpenTelemetry agent, the same GKE install, and the same native…
-
Docker Status: How to Check If Docker Is Down and Fix Common Errors
Docker status isn’t one thing. When a container looks off, you’re never sure whether to check the daemon, the container itself, or the app running inside it, and there’s no single docker status command that just tells you. This guide gives you the exact command for each of the three status types, so you can find what’s…
-
How AI-Driven Alerts Caught a Memory Leak Before It Became an Outage
A memory leak was growing quietly in production, invisible to threshold-based monitoring. Within hours of deploying the middleware, the team behind it received an AI-driven alert that flagged the anomaly before it could cascade into a full outage. TL;DR A memory leak grew silently in production until an AI-driven alert flagged the anomaly hours before pods would…
-
Kubernetes CrashLoopBackOff: Causes, Diagnosis, and Fixes
Summary: CrashLoopBackOff is one of the most common and most frustrating Kubernetes errors engineers face in production. It means a container keeps crashing and restarting in a loop, but the error actually causing it is hidden inside logs and exit codes that most guides gloss over. This article covers every root cause in depth, gives…
-
What Is Kubernetes ImagePullBackOff Error and How to Fix It
Summary: ImagePullBackOff is a Kubernetes pod status that prevents your application from starting before it can pull the image. The container image can’t be pulled from the registry, so nothing runs. It’s one of the first errors engineers hit when deploying to Kubernetes, and while the fix is almost always straightforward once you know the…
-
Docker Health Checks: How to Monitor, Configure, and Troubleshoot Container Health
Docker health checks are used to determine if an application running inside a container is actually functioning correctly and not just if the container process is running. A container can appear “up” while its application is unresponsive, misconfigured, or unable to reach required dependencies. Health checks solve this gap by actively validating real application behavior.…
