https://upmonitor.io/blog UpMonitor engineering notes on uptime monitoring, DNS, TLS, security headers, and web performance. en Sat, 29 Aug 2026 00:00:00 GMT https://upmonitor.io/blog/ai-agents-silent-production-failures https://upmonitor.io/blog/ai-agents-silent-production-failures AI coding agents optimize for code that runs, not behavior that is correct. Green CI and HTTP 200 hide silent regressions. Here is how to catch them. Mon, 22 Jun 2026 00:00:00 GMT https://upmonitor.io/blog/googlebot-2mb-crawl-limit https://upmonitor.io/blog/googlebot-2mb-crawl-limit Googlebot indexes only the first 2MB of your HTML, measured on uncompressed bytes, distinct from the 15MB fetch limit. Detect silent truncation and fix it. Fri, 19 Jun 2026 00:00:00 GMT https://upmonitor.io/blog/upmonitor-protocol-relay https://upmonitor.io/blog/upmonitor-protocol-relay Learn how the UpMonitor CLI and custom protocol bridge the gap between cloud alerts and local recovery playbooks for AI agents. Sat, 11 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/hsts-preloading-guide https://upmonitor.io/blog/hsts-preloading-guide Learn how to get your domain on the global HSTS preload list to ensure maximum transport security. Fri, 10 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/http-status-codes-explained https://upmonitor.io/blog/http-status-codes-explained A comprehensive guide to understanding server response codes and how they affect your site's availability. Thu, 09 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/fix-mixed-content https://upmonitor.io/blog/fix-mixed-content Fix mixed content in 3 steps: find every http:// resource with DevTools and a report-only CSP, rewrite the source, then add upgrade-insecure-requests. Wed, 08 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/dns-propagation-guide https://upmonitor.io/blog/dns-propagation-guide Learn the mechanics of DNS propagation, the impact of TTL, and how to track your changes globally. Tue, 07 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/technical-seo-audit-guide https://upmonitor.io/blog/technical-seo-audit-guide How to ensure your website is fully discoverable by search engines and AI crawlers using our free diagnostic tools. Mon, 06 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/free-uptime-monitoring https://upmonitor.io/blog/free-uptime-monitoring A beginner's guide to setting up professional-grade uptime monitoring and diagnostic audits for free. Sun, 05 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/security-headers-guide https://upmonitor.io/blog/security-headers-guide How to implement and verify critical HTTP security headers to protect your website from client-side attacks. Sat, 04 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/ssl-troubleshooting https://upmonitor.io/blog/ssl-troubleshooting Every common SSL/TLS browser error decoded - NET::ERR_CERT_DATE_INVALID, ERR_CERT_AUTHORITY_INVALID, handshake failures, name mismatch - with the exact openssl probe and server-config fix for each. Fri, 03 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/monitoring-pipeline https://upmonitor.io/blog/monitoring-pipeline Learn how to use the UpMonitor CLI to automate website health checks in GitHub Actions, GitLab CI, and more. Thu, 02 Apr 2026 00:00:00 GMT https://upmonitor.io/blog/website-security-checklist https://upmonitor.io/blog/website-security-checklist A step-by-step guide to auditing your website's security - SSL certificates, security headers, HTTPS redirects, and automated monitoring with UpMonitor. Wed, 01 Apr 2026 00:00:00 GMT