——新增了OPC UA Certificate传感器用于工业自动化证书监控，以及Beckhoff IPC System Health传感器用于工业PC健康检查。
Version 21 brought several "interesting" updates documented in the PRTG 21 History Modbus TCP Custom Sensor
Single-page application design built on AJAX for real-time updates without page refreshes. prtg network monitor 21.0.x
The 21.0.x release cycle introduced targeted improvements aimed at enterprise reliability and modern security compliance. Advanced Security and Multi-Factor Authentication (MFA)
A chaotic device tree makes managing alerts difficult. PRTG uses a hierarchical structure where configurations, credentials, and notification schedules pass down from parent groups to child devices. Core Server : The fundamental monitoring elements
For agentless monitoring of Windows environments, tracking services, event logs, and performance counters.
PRTG Network Monitor version 21.x, developed by Paessler, is a unified infrastructure monitoring solution that tracks the performance and availability of servers, network devices, and applications Core Architecture The system operates on a core/probe architecture to ensure scalability and reliability. Core Server understanding the updates
: The fundamental monitoring elements. Each sensor tracks one specific metric, such as CPU load, disk space, or ping latency.
The Core Server is the central nervous system of PRTG. It houses the built-in proprietary database, the web server, and the central configuration files. In version 21.0.x, the data storage engine received significant performance optimizations, reducing disk I/O bottlenecks when processing high volumes of historical data. Probes (Local and Remote) Probes perform the actual monitoring work.
The core strength of the 21.0.x version lies in its . Instead of requiring multiple tools for different components (servers, cloud, traffic), PRTG provides a unified interface where all data is gathered by "sensors." Key Components:
For IT administrators managing complex networks, understanding the updates, sensor mechanics, and scale limitations introduced in the 21.0.x generation is essential for building a resilient monitoring environment. Core Architecture and Release Structure