Stack category
European Monitoring & Uptime Tools
Monitoring checks your site from the outside (uptime, SSL, performance) and from the inside (servers, containers, metrics) and alerts you the moment something breaks.
Why this layer matters for sovereignty
Uptime checkers run from many vantage points and record response times, IPs, and error bodies for every request they send — that telemetry stream is personal data the moment it can be linked to anyone.
Incident notifications carry operational secrets: host names, endpoints, error messages. Where those notifications are processed matters.
Self-hosted open-source monitors keep the entire pipeline — checks, metrics, alerts — inside infrastructure you control.
What to look for
Check frequency (15–60s) and enough global probe locations to distinguish 'site down' from 'network hiccup'.
Status pages you can host on your own domain and brand as your own.
Notification channels you already use (webhooks, Matrix, Signal, email) — alert fatigue kills the value of monitoring.
For self-hosted tools: resource footprint and whether updates are one command or a project.
European & open-source monitoring providers
Curated as part of the European Stack Builder. Badges reflect the organization's origin — EU, EEA, EFTA, and UK count as European.
Uptime monitoring, status pages, and on-call scheduling with 30-second checks from 18 global locations
Open-source infrastructure monitoring for servers, networks, Kubernetes, and cloud environments
Website, server, and application monitoring with uptime checks, heartbeat monitoring, and server resource tracking
Uptime monitoring with API checks, SSL monitoring, incident management, and customizable status pages
All-in-one monitoring for uptime, performance, broken links, SSL, mixed content, and cron jobs
Simple uptime monitoring with 30-second checks, SSL monitoring, and multi-language status pages
Website monitoring for uptime, broken links, SSL certificates, and automated Lighthouse testing
Hosted status pages and incident communication platform with automations and 40+ integrations
Website and uptime monitoring with 15-second checks, error detection, SSL monitoring, and SEO issue tracking
Simple and inexpensive website monitoring with hosted status pages and credit-based pricing
Free uptime monitoring with 50 monitors, SSL and keyword checks, status pages, and 20+ integrations
All-in-one website uptime and performance monitoring from 171 worldwide checkpoints
Uptime Kumagithub.com
Self-hosted monitoring tool with status pages, multiple notification channels, and multi-protocol support
SEO website monitoring for meta tags, redirects, canonical tags, status codes, and HTML backups
Enterprise-class open-source monitoring for servers, networks, cloud, and applications with real-time alerting
Frequently asked questions
What does an uptime monitor do?
An uptime monitor sends periodic HTTP, TCP, or ICMP requests to your site or service from multiple locations and alerts you when checks fail repeatedly. Most also watch SSL certificate expiry, keyword presence on the page, and heartbeat signals from cron jobs or background workers.
What is a status page?
A status page is a public or internal page showing the current health of your services — uptime, incident history, and maintenance windows — usually hosted on a subdomain like status.example.com so it stays reachable when the main site is not.
Why self-host monitoring?
Monitoring data describes the inside of your infrastructure: hostnames, endpoints, error rates, capacity. Self-hosted open-source tools such as Icinga, Zabbix, or Uptime Kuma keep that picture entirely within your own perimeter, with no third party in the loop.
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