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How can I set Warning and error limits for a smaller getting value?

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I created a custom WMI Sensor to get the days left of Windows Server evaluation. Until here no problem, I get the minutes from WMI and divide them by 1440 to get the days.

Now I wan't to set error and warning levels like:

Warning upper 10 days
Warning lower 6 days
Error upper 5 days
Error lower 0 days


but it will not be accepted...

I tried also

Warning upper 6 days
Warning lower 10 days
Error upper 0 days
Error lower 5 days


but same error...

How can I solve this?

Greets Daniel

error-limits prtg warning-limits

Created on Jan 10, 2022 9:19:12 AM by  triggad23 (0) 1

Last change on Jan 10, 2022 9:26:14 AM by  Felix Wiesneth [Paessler Support]



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Hi Daniel,

For sensor status Warning for values from 10-5 and status Error for values 5-0, you need to configure it like following:
Lower Warning Limit = 10
Lower Error Limit = 5

In this way the limit for Warning is reached if the received value is 10 or below and will change to Error if 5 is reached.


Kind regards

Felix Wiesneth - Team Tech Support

Created on Jan 11, 2022 11:14:38 AM by  Felix Wiesneth [Paessler Support]



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Have you tried adding a threshold trigger? You can select it to trigger when the value is below a number. Of course you will need to use minutes for it to match with the sensor values.

Created on Jan 10, 2022 10:40:46 AM by  Toy Razee (10)



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Hi there,

Please note that you will need to enter the limits in this following order:
Upper Error Limit >= Upper Warning Limit >= Lower Warning Limit >= Lower Error Limit
According to the values you shared, you are not following this order.


Kind regards

Felix Wiesneth - Team Tech Support

Created on Jan 11, 2022 6:34:28 AM by  Felix Wiesneth [Paessler Support]



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Thanks for your answers!

@Toy: With a trigger I only can get a notification but no status change. This is not what I want. We are monitoring the status with a map, so a status change would be important when the value gets below a certain number...

@Felix: I tried: Upper Error 5 and everything else 0

Then I get an error status with 81days left...

Greets Daniel

Created on Jan 11, 2022 9:47:02 AM by  triggad23 (0) 1



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Hi Daniel,

PRTG should give an error when 81 days are left since it is more than your limit configured of 5. If you want to get alerted when only 5 days are left, you need to configure this as Lower Error Limit.


Kind regards

Felix Wiesneth - Team Tech Support

Created on Jan 11, 2022 10:20:01 AM by  Felix Wiesneth [Paessler Support]



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Hi Felix,

this seems to work now.

I have one Server that is at 5,12 days now. When everything is ok it should go to error status during this day.

It would be nice if we could make a warning before error (i.e. 10-5 warning, 5-0 error) bit it seems that this is impossible at the moment, right?

Greets Daniel

Created on Jan 11, 2022 10:50:22 AM by  triggad23 (0) 1



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Hi Daniel,

For sensor status Warning for values from 10-5 and status Error for values 5-0, you need to configure it like following:
Lower Warning Limit = 10
Lower Error Limit = 5

In this way the limit for Warning is reached if the received value is 10 or below and will change to Error if 5 is reached.


Kind regards

Felix Wiesneth - Team Tech Support

Created on Jan 11, 2022 11:14:38 AM by  Felix Wiesneth [Paessler Support]



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Felix, thanks a lot!

This was exactly what I wanted. I misunderstood the limit system completely.

Perhaps this could be better documented in the help pages? With more examples?

Greets Daniel

Created on Jan 11, 2022 11:21:29 AM by  triggad23 (0) 1



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Hi Daniel,

I'm happy to hear that it works for you now. I will check if we change the documentation and give some more examples.


Kind regards

Felix Wiesneth - Team Tech Support

Created on Jan 11, 2022 2:03:56 PM by  Felix Wiesneth [Paessler Support]



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