Nagios Support Forum

I need convert an int to float on some snmp data and one of the Nagios sales guys said that check_snmp can do that sort of math in a query. I checked the man page and couldn't figure it out. It looks like the rate option might let me do what I want, but there isn't much info about how to do it.
For example, RSSI is returned as 8247, but I need to see it as 82.47 (it's actually supposed to be a negative number, but not sure if that would break anything)
Or temp needs to be decimal shifted from 715 to 71.5

Hey @michaewlewis

I'm not positive on the solution, however from taking a glance multiplier would seem like the correct flag to throw to me. maybe something like adding --rate-multiplier 0.1 to the end for getting 715 to 71.5. Let me know if this works.

I tried adding --rate-multiplier 0.1 to the end of the command and it says it has to be a positive integer. I tried changing it to 10 and it didn't change it at all.

According to the man page https://nagios-plugins.org/doc/man/check_snmp.html, it says --rate-multiplier sets the seconds by which the rate is divided. i.e. --rate-multiplier 1 would give you rate/second, 60 would give you rate/minute and 3600 would give rate/hour. In your case, setting it to --rate-multiplier 10 would give you rate per 10 seconds.

Hi @michaewlewis, thanks for reaching out.

Have you tried --multiplier?

If I run check_snmp, I get this...
If I add a --multiplier of .01, I get this...

I hadn't tried --multiplier. I skipped right over it somehow. That works, but it rounds the result to the nearest whole number. Not a big deal for temperature, but RSSI could benefit from a little more precision. Still better than nothing, though.

Hi @michaewlewis,

I am glad that will work for you. I will create a request to get more precision with the --multiplier argument.

Any news on this feature? I'm monitoring electricity and the multiplier argument is really helpful, but it ends up making 0.837 into 0, which isn't ideal for measuring watts and amps.

Hi @PCMRobertHirabayashi, thanks for reaching out.

I have incremented the weight on this issue. I do not have any control over when issues get scheduled. Requests are weighted by how many users have asked for it. Which includes forum post, contacting sales reps or contacting the support team.

Once this issue has been worked, it will show up in the CHANGELOG with this reference [GL:XI#857].