thold: Alert on nan values

[ralfk]

Hi,

I have setup a Low Threshold in thold, let's say to 100. It works so far. But the alarm does also occur if recent data in RRDtool is a nan value. How can I fix thold not to create alerts if nan values are fetched from RRDtool ?

I have installed Cacti 0.8.6g, thold 0.2.6 and RRDtool 1.2.11.

Cheers
Ralf

[cigamit]

Hi,

I have setup a Low Threshold in thold, let's say to 100. It works so far. But the alarm does also occur if recent data in RRDtool is a nan value. How can I fix thold not to create alerts if nan values are fetched from RRDtool ?

I have installed Cacti 0.8.6g, thold 0.2.6 and RRDtool 1.2.11.

Cheers
Ralf

I have noticed this also, and will probably add an option to disable it per threshold. There are certain times when you want it to alert, for instance, I found that the windows services return NAN when they are stopped, instead of 0.

[ralfk]

An option would be fine per threshold, but how can I disable this behaviour permanently now for all thresholds ? Any quick fix suggested ?

Thanks in advance
Ralf

[opornik]

Hi,

I have setup a Low Threshold in thold, let's say to 100. It works so far. But the alarm does also occur if recent data in RRDtool is a nan value. How can I fix thold not to create alerts if nan values are fetched from RRDtool ?

I have installed Cacti 0.8.6g, thold 0.2.6 and RRDtool 1.2.11.

Cheers
Ralf

I have noticed this also, and will probably add an option to disable it per threshold. There are certain times when you want it to alert, for instance, I found that the windows services return NAN when they are stopped, instead of 0.

Hi,
Does anyone have solution for this? I started using thold v 3 and it still doesn't have the option to disable alerting in case of NAN values.

[cigamit]

Still in the works, I will try to roll the option in the rewrite I am doing. No promises as other payed projects take priority.

[briang]

I'm also eagerly awaiting the ability to supress the alerts generated by nan values....

A few times our cacti server has had a problem with utilization which in turn effects the poller. As a result we get a number of nan entries resulting in false alerts.

[Lazybones]

Hmm maybe a simple solution would be to convert all Nan values (in threshold only) to -1.

Then setting a low threshold of 0 WOULD alert you of Nan where as setting no low threshold would not.

This would be a problem however if you needed a low threshold value and you didn't want to count Nan.

[gameone]

Hmm maybe a simple solution would be to convert all Nan values (in threshold only) to -1.

Then setting a low threshold of 0 WOULD alert you of Nan where as setting no low threshold would not.

This would be a problem however if you needed a low threshold value and you didn't want to count Nan.

how to convert the NAN to -1?

I am facing this nan problem for low thershold alert

[TheWitness]

In poller.php or lib/poller.php when you encounter a "U", change to "-1" prior to transferring the contents to the THold plugin.

In the current version of THold, that takes place at the very end. However, this may not be a good solution. I would still recommend waiting on Jimmy. However, if you don't have any graphs that go negative, it should be a quick hack.

If that's not comfortable, then you might want to consider modifying cmd.php or cactid. However, this will break spike prevention in Cacti for counters.

TheWitness