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Comparing two statistics obtained via a SAM Linux Script component

I currently poll our DHCP servers for number of DISCOVER and OFFER packets.

If these get out of sync by more than a few then it usually indicates an error/issue with the DHCP server/scopes.

I have been trying to find a way to alert if these two statistics differ by more than about 5 but cannot seem to see a way to do it.

Tried looking at the application component script output where you can specify warning and error alerts based on a number, but not another script output variable.

Also looked at a custom alert, but using SWQL or SQL limits you to certain SELECT strings of which statistic doesn't seem to be one.

Any one have any ideas?

Thanks

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Accepted answers

All comments

wayne1022d

Do you have more details on the output and your expectation?

rjones-uk

See below for a graph showing the statistics within the component. The key ones for me for this are Discovery (green) and Offer (cyan). There was an issue from midnight until just after 9am and you will see that the two lines are way different. After this time until about 3pm when another issue occurred, they follow each other.

I'd like an alert when they start to drift apart and are different. Hope that explains it well :-)

sum_giais

If you're using a linux script already - why not add another linux script component, and gather the values of discover / offer packets, and do the arithmetic to determine the difference inside the script? Then it'd be a simple if over 5 warning threshold on that new component.

There's ways to do it without that, but you'd have to query the solarwinds api or database for the most recent datapoints of those values, probably more complex than adding another script component to do it for you.

rjones-uk

Thanks, good idea, will give that a go tomorrow :-)
I'll see if I can modify the script to calculate the difference as a separate output

Cheers

rjones-uk

Success, thanks all.