Uptime (availability)
The percentage of time a site is reachable. 99.9% uptime equals about 8 h 45 of downtime per year. It’s the base indicator of any monitoring.
Availability monitoring →Glossary
The vocabulary of monitoring,
finally clear.
Uptime, CVE, TTFB, Core Web Vitals, malware… The key terms of monitoring, security and performance, defined simply.
TTFB (Time To First Byte)
The time between the browser request and the first byte of the server response. A high TTFB often betrays undersized hosting or cache.
Performance monitoring →Core Web Vitals
A set of Google metrics measuring the real experience of a page: LCP (render speed), INP (responsiveness) and CLS (visual stability). They influence ranking.
Core Web Vitals & PageSpeed →LCP (Largest Contentful Paint)
The render time of the largest visible element on a page. Recommended target: under 2.5 seconds.
INP (Interaction to Next Paint)
A measure of a page’s responsiveness to user interactions. Replaces the old FID in Core Web Vitals.
CLS (Cumulative Layout Shift)
A measure of visual stability: layout shifts cause misclicks and frustration.
CVE (Common Vulnerabilities and Exposures)
A standardised identifier for a known security vulnerability. A module tied to a CVE should be fixed or updated as a priority.
Security & vulnerabilities →Malware
Malicious code injected into a site (data theft, redirection, mining, defacement). On a store, it directly threatens customers and reputation.
Malware detection →Blacklist / Google Safe Browsing
A list of sites flagged as dangerous. A blacklisted site sees its traffic collapse, with the browser showing a red warning to visitors.
Blacklist monitoring →SSL / TLS
The encryption protocol that secures exchanges between browser and server (the HTTPS “padlock”). An expired certificate triggers a browser warning that scares buyers away.
DNS (Domain Name System)
The system that translates a domain name into an IP address. A suspicious change to DNS records may betray a compromise or cause an outage.
PageSpeed
A Google tool that scores a page’s performance (mobile and desktop) and lists optimisation opportunities.
Friends-of-Presta
A community initiative that catalogues PrestaShop module vulnerabilities. KLN relies on it for CVE detection on the PrestaShop side.
PrestaShop monitoring →Wordfence
A reference in WordPress security, whose vulnerability database helps detect risky extensions.
WordPress monitoring →Cron (scheduled task)
A task run automatically at regular intervals (syncs, exports, emails). A silently broken cron can break business processes with no visible alert.
Preventive maintenance
An approach that detects and fixes problems before they cause an incident, as opposed to curative maintenance (fixing after the outage).
Preventive maintenance →AI Copilot
In KLN Monitoring, the intelligence that analyses your site and proposes contextual, actionable improvements — beyond mere incident detection.
The AI copilot →Put these concepts to work
KLN Monitoring watches all of this for you, 24/7 — and tells you what to do with it.
14 days free · then €29.90/month