https://3xui.polanyidong.icu/ Field notes from a small infrastructure group: failover, TLS at the edge, routing, telemetry budgets and configuration hygiene. en Tue, 08 Sep 2026 09:00:00 +0000 https://3xui.polanyidong.icu/posts/boring-failover.html https://3xui.polanyidong.icu/posts/boring-failover.html Tue, 08 Sep 2026 09:00:00 +0000 Recovery plans that depend on a healthy control plane are the ones that fail when it matters. A short argument for degrading instead of orchestrating, and for rehearsing the real path. https://3xui.polanyidong.icu/posts/tls-at-the-edge.html https://3xui.polanyidong.icu/posts/tls-at-the-edge.html Fri, 14 Aug 2026 09:00:00 +0000 A certificate that expires at the terminator is an availability event, not a config detail. What we watch now, and why "renewal succeeded" is not a useful signal. https://3xui.polanyidong.icu/posts/observability-budget.html https://3xui.polanyidong.icu/posts/observability-budget.html Tue, 21 Jul 2026 09:00:00 +0000 Cardinality, retention and attention all cost something. A per-service budget, three kinds of dashboard, and the discipline of deleting things. https://3xui.polanyidong.icu/posts/anycast-notes.html https://3xui.polanyidong.icu/posts/anycast-notes.html Wed, 03 Jun 2026 09:00:00 +0000 One address, many locations — and a set of problems that move out of your software and into your routing. https://3xui.polanyidong.icu/posts/config-drift.html https://3xui.polanyidong.icu/posts/config-drift.html Mon, 27 Apr 2026 09:00:00 +0000 The running system and the description of the running system have diverged. Why drift is a documentation failure, and what a weekly diff actually buys you.