CacheableLookup defaults to maxTtl=Infinity, meaning successful DNS lookups are cached forever until process restart. This causes monitors to fail permanently if DNS changes or if a resolver outage causes ENOTFOUND errors to persist after recovery. Set maxTtl=300s (5 min) for successful lookups and errorTtl=30s for failed lookups so the cache recovers automatically.
Checkmate backend
The backend service for Checkmate, an open source uptime and infrastructure monitoring application
This directory contains the backend of Checkmate, which handles data processing, storage, and API services for the Checkmate monitoring tool. The backend is responsible for managing uptime checks, handling real-time alerts, and storing historical monitoring data.
Checkmate's backend is designed to be lightweight and scalable, ensuring reliable performance even with a high number of active monitors.
Installation & documentation
For setup instructions, configuration details, and deployment guidelines, please visit our official documentation at docs.checkmate.so.
Related repositories
- Capture Agent (Optional, provides additional server insights)