Prtg Network Monitor 21.0.x -

For stable, air-gapped, or legacy environments: . PRTG 21.0.x remains one of the most reliable and resource-efficient major releases Paessler ever shipped. It introduced clustering that worked, a web UI that didn’t lag, and an API that enabled real automation. Thousands of businesses still run it daily—often quietly, without drama.

| Sensor Type | Improvement | |-------------|--------------| | | Now supports custom request headers and OAuth 2.0 bearer tokens | | SNMP Traffic Sensor | Reduced memory leak issues for high-traffic 10GbE interfaces | | WMI Service Sensor | More resilient to Windows updates and DCOM permission changes | | Ping Sensor | Added jitter and packet loss percentage (previously required scripting) | | VMware Host Health | Compatibility with ESXi 7.0 | prtg network monitor 21.0.x

Compared to version 18.x, the same 10,000 sensors used and 15% less RAM —a testament to the optimization in 21.0.x. 10. Known Issues and Workarounds for 21.0.x Despite its maturity, PRTG 21.0.x has documented quirks: For stable, air-gapped, or legacy environments:

| Feature | 21.0.x | 22.x+ | |---------|--------|-------| | | Limited | Full CLI (prtgcli) | | Built-in Maps v3 | No (v2 only) | Yes, drag-and-drop | | Monitoring as Code | Manual API only | Terraform provider | | ARM64 support | No | Yes | | GraphQL API | No | Beta | | Legacy custom sensors | Fully supported | Deprecation warning | Thousands of businesses still run it daily—often quietly,