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The CompleteStatus Blog

Monitoring & security, explained

Practical, no-fluff guides on uptime and security monitoring — fixing security headers, email authentication, SSL certificates, and consolidating your monitoring stack.
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All posts security 23 uptime 21 monitoring 19 incidents 18 outages 10 tls 9 https 9 dns 8 ssl 8 performance 8 email-security 6 security-headers 5
alerting slack

Send Alerts Where Your Team Actually Lives — Slack, Discord, Telegram and Webhooks

Email alerts get buried. How to route monitoring alerts to Slack, Discord, Telegram and webhooks — channel design, dedup, and who actually gets paged.
· 6 min read
http3 quic

HTTP/3 and QUIC, Explained — What Just Became a Standard Actually Changes

HTTP/3 is now a Proposed Standard. What QUIC's UDP transport, baked-in TLS 1.3 and connection migration change — and what they mean for monitoring your site.
· 6 min read
outages incidents

The Atlassian Outage — Two Weeks of Downtime and a Masterclass in What Not to Say

A maintenance script permanently deleted ~400 Atlassian customers' cloud sites; restoration took two weeks. Lessons on incident communication and backups.
· 6 min read
redirects http

Redirect Chains — What Every Extra Hop Costs, and How to Monitor Them

How http→https→www→slash stacks into 3–4 hops, what each hop costs in DNS and TLS handshakes, the apex-vs-www certificate gotcha, and how to monitor the chain.
· 6 min read
uptime monitoring

Ping vs HTTP Checks — What "Up" Actually Means

Ping succeeds while your site serves 500s; HTTP 200 while the page is broken. What ICMP, TCP, HTTP and browser checks each prove — and when to use them.
· 6 min read
security log4shell

Log4Shell — What CVE-2021-44228 Is Teaching Us, Mid-Scramble

Log4Shell (CVE-2021-44228) is a trivially exploitable RCE in Log4j — and patching is still under way. What the scramble teaches every team, Java shop or not.
· 6 min read
outages dns

The Facebook Outage — What BGP and DNS Taught Everyone This Week

Facebook, Instagram and WhatsApp vanished for six hours this week after a BGP misstep took out their DNS. What the outage teaches every team about resilience.
· 6 min read
https tls

Fixing Mixed Content Warnings — Finishing the HTTPS Migration You Started

Active vs passive mixed content, how browsers treat each, finding hardcoded http:// URLs, CSP upgrade-insecure-requests, and staying clean after migration.
· 6 min read
outages cdn

The Fastly Outage — What Tuesday's Hour of Broken Internet Teaches About Third-Party Risk

Fastly's June 8 outage took down Amazon, Reddit and gov.uk for nearly an hour. What one config change teaches about CDN blast radius and third-party risk.
· 6 min read
ssl lets-encrypt

Let's Encrypt Renewal Failures — When 90-Day Automation Silently Stops

Let's Encrypt automation fails quietly — broken certbot upgrades, rate limits, blocked port 80, lost cron jobs. Independent expiry monitoring is the net.
· 6 min read
http status-codes

HTTP Status Codes Through a Monitoring Lens — What Should Actually Page You

Not every non-200 is an outage and not every 200 is fine. Which HTTP status codes should page you, how to handle 503s and redirects, and the soft-200 trap.
· 6 min read
cookies samesite

Chrome's SameSite Cookie Change Is Fully Live — Here's What Silently Breaks

Chrome now treats cookies as SameSite=Lax by default, breaking cross-site POSTs, SSO and payment callbacks. What changed, what breaks, and how to fix it.
· 6 min read

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