colour node based on lack of data

[yee379]

so i have some rrd's that are read in to my network weathermap and it works great. however, i would like to extend it such that if no data was collected in the last period my node would show up, in say, red.

the idea is that if many nodes on my weathermap goes red, then there's something seriously wrong... (simple i know!)

so i understand i can do something like

ICON images/nodestatus_{node:this:state}.png

but what state is 'no data'?

thanks,

[Howie]

so i have some rrd's that are read in to my network weathermap and it works great. however, i would like to extend it such that if no data was collected in the last period my node would show up, in say, red.

the idea is that if many nodes on my weathermap goes red, then there's something seriously wrong... (simple i know!)

so i understand i can do something like

ICON images/nodestatus_{node:this:state}.png

but what state is 'no data'?

thanks,

The state thing only works with the cactihost: target, not with rrd targets. It's just the state retrieved from the cacti database for that host.

If you are looking at traffic rrds, then they are very rarely *exactly* zero, so you could have:

Code: Select all

SCALE 0 0 255 0 0

in the top of your scale to make things that are exactly zero red. Usually there's some pings or ARP or similar traffic to give you a few bits/sec, if the link is running. Similarly, if Weathermap fails to get valid data from the rrd (e.g. NaNs) then you'll get exactly 0 then too.

It depends on what you are measuring, but there's no general way to see if there was no data for a target. Maybe there should be...

[DLNoah]

On a similar note, for the SNMP data source, it would be useful to me if I could have a distinct "didn't return data" value, other than zero. The OID i'm monitoring will return 0 when the UPS has no power (and is on battery), but I'd like to have a different status icon for "no power" than for "not up". As is, I don't have a way to differentiate -- not up will return a 0 to weathermap, the same as no power.

[streaker69]

On a similar note, for the SNMP data source, it would be useful to me if I could have a distinct "didn't return data" value, other than zero. The OID i'm monitoring will return 0 when the UPS has no power (and is on battery), but I'd like to have a different status icon for "no power" than for "not up". As is, I don't have a way to differentiate -- not up will return a 0 to weathermap, the same as no power.

That is a simple solution. Most of the UPS' have an OID for input voltage. Just graph your input voltage and when it reaches 0 or in my case, less than 100 then it would change color.

Some of them have an OID for an "on battery" state, but I found input voltage to be a better thing to graph because you can find if your UPS is being starved for electricity, like in a case where I was running them off of a generator and it wouldn't idle up enough to supply more than 98vac. We didn't have enough load on a 15kw generator to have it idle up.

[Howie]

So really there are two things here:

one is setting some SET variable for 'no data' per link/node. That's simple enough. What should happen when you have two targets and only one of them fails, though? What about where 'in' works but 'out' doesn't? (if you are aggregating from two different interfaces at either end of a link)

The other is possibly some way to set the colour used for no data vs zero in a scale, or some other way. That also relies on the 'no data' signal coming all through the code to where things are drawn, but it's probably overdue.