we appreciate your feedback.
You're referring to this, correct? (Example: )
|Report Time Span:||12.09.2016 14:58:00 - 13.09.2016 14:58:00|
|Sensor Type:||Ping (5 m Interval)|
|SENSOR STATUS HISTORY|
|Unknown||12.09.2016 14:58:00 − 12.09.2016 14:58:48||(=48 s)|
|Up||12.09.2016 14:58:48 − 13.09.2016 14:53:48||(=23 h 55 m)|
This happens because the routine that calculates the History Status doesn't "filter" these first 48 seconds (in this example) prior to the first scanning of the sensor(in other words, there are no readings stored in the database for the period of 14:58:00 - 14:58:48). This time is technically "unknown" as there are no readings for it.
I will raise awareness to this in development, but can't confirm at this time whenever we'll change this behavior in the future, but there's no configuration/setting to modify this behavior in the current (16.3.25) PRTG Version.
New: Edit (21/09/2016)
I've received confirmation from development that there's no plan to modify this behavior at the moment, as it would not be a straightforward change and may have unwanted side effects which we'd like to avoid.
Luciano Lingnau [Paessler Support]