A GitOps deadlock between a new readiness probe and an old image
GitHub redirected the repository but not the GHCR coordinate, so Argo CD combined a new /ready probe with an image that could only return 404.
Troubleshooting
Reproducible failures, evidence, root causes, fixes, and regression prevention.
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Why valid bearer requests returned 401 only in production
A Spring Security incident where an Auth0 filter chain captured every path, rejected another JWT format, and remained invisible under the test profile.
How Windows CI exposed a SQLite connection leak hidden by Linux
A WinError 32 portability failure caused by assuming with sqlite3.Connection closes the handle, plus UTF-8 and semantic Path fixes.
Trusting the first X-Forwarded-For value broke rate limiting
Redesigning client-IP trust across ALB and a BFF, then bounding the rate-limiter map that attacker-controlled keys could grow indefinitely.
The success-path bug hidden behind HTTP 429
How I isolated a RAG embedding failure to token throughput, then fixed the Jackson response contract that only appeared after rate limiting was gone.