What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

Thresholds trigger definition




I would like to setup threshold conditions triggering a notification, not based on an explicit value, for 2 different cases : - case 1 : detect sensor value is increasing - case 2 : for a sensor sending back a string, trigger notification if a specific string is received

So, how could I setup the configuration to answer theses needs : - if sensor value is increasing, then this triggers a notification sending - if a sensor value is a string, trigger a notification for a specific string

Thanks a lot for your support.

Best regards

string threshold threshold-trend trend

Created on Jul 15, 2019 8:17:22 AM

1 Reply



Dear ocella,

notifying on increasing values is not supported by PRTG. The SNMP Custom sensor has the Counter data type. This is the difference of the current value minus the last value, and the result over the time of the last scanning interval, so that you get a bandwidth. With a value above zero, the value has been larger than the last one. However Counters imply that the value only can increase and not decrease.

Regarding the string, which sensor type do you use here? PRTG processes only numbers as sensor channel data. For SNMP, there is a Custom String Lookup sensor. This allows you to map pre-defined strings to numerical value using a lookup.

Created on Jul 15, 2019 11:55:35 AM by  Arne Seifert [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.