Hands-on guides to uptime, SSL certificates, HTTP errors, alerting and incident response — with the commands and configs to act on them.
How to benchmark competitors' public uptime and response times politely, what the data can and cannot tell you, and how to turn it into positioning.
How LCP, INP and CLS relate to conversions, how server response time feeds into LCP, practical fixes, and how to measure the effect on your own site.
Let a monitor restart services over SSH without handing it root: a dedicated user, a forced-command key, a one-line sudoers rule and idempotent scripts.
Slack or Discord for downtime alerts? Compare webhook setup, push behavior, history limits and permissions, then test your webhook with curl in two minutes.
Expiry, broken chains, hostname mismatches, weak TLS: how SSL certificates fail, the openssl commands to check them, and how far ahead your alerts should fire.
The 18 HTTP status codes webmasters actually meet: what each means, the usual cause, how search engines treat it, and when a monitor should count it as up.
HSTS, CSP, X-Content-Type-Options, frame-ancestors and Referrer-Policy: what each prevents, safe starting values, nginx and Apache configs, and pitfalls.
Work out how fast you really detect an outage from check interval and fail threshold, then pick settings by site type without drowning in false alarms.
What Time to First Byte really includes, how to measure each phase with curl, what web.dev calls a good TTFB, and the backend fixes that actually lower it.
A fill-in formula for the cost of an outage: lost revenue, wasted ad spend, support load, SLA credits and recovery labor, with a worked example.
What Googlebot does when your site returns 5xx errors or times out, how long before rankings are at risk, and how to run maintenance without hurting SEO.