Ethan WalkerinReliability & UptimeWhat Actually Causes Downtime in Modern Web ApplicationsDowntime in modern web applications is rarely caused by a single failure. In practice, outages usually happen because multiple small issues align across multiple layers.Feb 28•3 min read
Ethan WalkerinSSL, Domains & TrustPostmortem: When Expired Certificates Take Down Global InfrastructureA technical analysis of how major companies still suffer devastating outages due to missed certificate renewals and internal monitoring gaps.Mar 15•3 min read
Ethan WalkerinSSL, Domains & TrustWhy Wildcard Certificates Hide Production FailuresWildcard certificates are convenient but create massive blast zones. Learn how an expiring wildcard takes down dozens of subdomains simultaneously.Mar 15•4 min read
Ethan WalkerinSSL, Domains & TrustThe Complete Guide to Automated SSL Certificate MonitoringA comprehensive guide to TLS lifecycles, common expiration failures, and how to implement robust synthetic monitoring to catch certificate issues.Mar 15•5 min read
Ethan WalkerinDNS & NetworkingBest DNS Monitoring Tools for Infrastructure TeamsStop trusting internal metrics for external outages. Learn the architectural principles of outside-in DNS synthetic monitoring for SRE teams.Mar 8•3 min read
Ethan WalkerinDNS & NetworkingHow to Monitor DNS Resolution LatencyDNS latency happens before your app logs a single request. Learn how Anycast routing fails and how to measure true P99 lookup times from the edge.Mar 8•3 min read
Ethan WalkerinDNS & NetworkingDNS TTL Best Practices for Production SystemsSetting a DNS TTL too high can cause 24-hour outages, while setting it too low can DDoS your nameservers. Learn the best practices for production TTL management.Mar 8•3 min read
Ethan WalkerinDNS & NetworkingComplete Guide to DNS Monitoring: Prevent Downtime and Detect FailuresDNS failures are a massive blind spot for most SRE teams. Learn the failure modes, debugging workflows, and monitoring strategies to prevent silent downtime.Mar 8•6 min read
