Nagios Support Forum

Our wireless device collects performance data for Radio Signal Strength Indicator (RSSI) which is usually negative value.
When I tried to display the value of the RSSI performance data, it is not shown.

Is there anyway to display negative value in Graph Explorer?

The highcharts library supports negative values, but to be honest I haven't ever tried before. Can you send a sample of your plugin output and performance data and we can take a look at what rrdtool and the graph explorer does with it?

Hi Mike,
Thanks for your prompt response.
Please find below, the format of the result that is being sent to the NRDP API for RSSI service of a wireless device.
Please let us know, if you need further details.

<checkresult type='service'>
<hostname>192.168.77.197</hostname>
<servicename>RSSI</servicename>
<state>0</state>
<output>RSSI OK,-29 dBm|'RSSI'=-29dBm;-70.000000;-75.000000</output>
</checkresult>


In the above <Output> tag, ('RSSI'=-29dBm;-70.000000;-75.000000) forms the performance data.

Please find two attachments:
1. the screenshot for “performance graph” for the service
2. “Graphs Explorer” screenshot for the service.

It is observed that negative values are not displayed in Y-Axis of Graph Explorer.

It looks like I did have the minimum set at 0 for the graph explorer. I removed that setting from the attached component. Give it a try and let me know if that works. Install through the Admin->Manage Components page.

Mike,
The new Graph Explorer handles the negative value properly.

Thanks for your quick resolution.

Regards,

Good deal. I'll commit the changes for he next component version.