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Error Monitoring

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4xx Client Errors Explained: 400, 401, 403, 404 & 429
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4xx Client Errors Explained: 400, 401, 403, 404 & 429

What 4xx HTTP client errors mean — 400, 401, 403, 404, 405, 408, 410, 429 — their causes, how they differ from 5xx, and how to monitor and alert on them.

May 30, 2026 10 min read
5xx Error Rate Monitoring: 500, 502, 503 Alert Guide
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5xx Error Rate Monitoring: 500, 502, 503 Alert Guide

Track 5xx server error rates in production. Set alerts on 500, 502, 503 patterns and distinguish app bugs from infrastructure failures.

May 11, 2026 15 min read

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