Two possibilities are either load and or communication failure.
Release : 8.x, 9.x, 20.x
Component : UIM - SNMPCOLLECTOR
Too many robots and or other high load probes at the hub may prevent the templates from being applied, and should be moved to another hub.
Deactivate snmpcollector, ppm, and baseline_engine and then activate them again.
In some cases the template is correctly applied but the probe configure GUI fails to show the change, when this happens it may be necessary to restart the hub.
The process flow starts at the browser which communicates to the primary hub, to the secondary hub with snmpcollector, and then back again. Both ppm & baseline_engine are involved. Additionally ppm has a cache at:
The deactivate activate process clears that cache. It is also possible there is a break in the communication which the hub restart re-established.