Checkmate
Self-hosted monitoring for servers, websites, Docker containers, and game servers with uptime, performance, and incident alerts. No per-monitor pricing or data leaving your infrastructure.
Checkmate is an open-source alternative to:

Checkmate is an open-source, self-hosted infrastructure monitoring tool designed for teams who value control over their data and costs. Monitor servers, websites, Docker containers, and game servers with real-time uptime tracking, performance metrics, and multi-channel alerts.
Key Features
- Uptime Monitoring: Track HTTP, ping, TCP, gRPC, DNS, SSL, WebSocket, and PageSpeed endpoints from 6 continents with GlobalPing.
- Infrastructure Monitoring: Monitor CPU, memory, disk, and network usage across all servers with live gauges and historical charts.
- Docker Monitoring: Track container health, resource usage, and restart events for services like nginx, postgres, and redis.
- Game Server Monitoring: Monitor Minecraft, CS2, Valheim, and other game servers with player counts.
- Multi-Channel Alerts: Receive notifications via email, Slack, Discord, Telegram, Twilio SMS, Pushover, Matrix, ntfy, or custom webhooks.
- Public Status Pages: Create customizable status pages to keep users informed during incidents.
- Response Time Tracking: Monitor and analyze response times with historical charts and performance insights.
- Team Collaboration: Invite team members with role-based access control (Admin, Editor, Viewer).
- Global Uptime Monitoring: Deploy Checkmate via Docker Compose, Helm, or bare metal for flexible scaling.
Tech / Self-Hosting
- Deployment Options: Docker Compose (5-minute setup), Helm charts, or bare metal.
- License: AGPL-3.0 (fully open-source with no vendor lock-in).
- Data Privacy: All metrics and data remain within your infrastructure—nothing leaves your perimeter.
- Scalability: Designed for teams of all sizes, from small setups to enterprise environments.
- Integrations: Plugs into existing tools like Slack, Discord, Telegram, and webhooks for seamless workflows.