Ability to check and alert on custom log on stack driver for a log showing once

[jawad nammari]

Hello 

The only option I see available from stack driver is the ability to set a rate of change for a custom log metric with a duration and a threshold. Once the threshold is exceeded for the full duration I get the alert.

However, I simply want to add a policy to check the existence of a specific custom log metric, and to alert if that log shows at any time - even if it shows once -. Is there a way to do this I did not notice?

Thanks in advance.

 

[George (Cloud Platform Support)]

Hello Jawad,

Metrics are to be chosen from a drop-down list in Stackdriver. The usual interest is to get notified if the value of the metric crosses a certain chosen threshold. There is also an alert for missing metrics, but not for present metrics. This is very likely due to the fact that a present metric has a value. If you set it to zero (or a very small number, for that matter), then you get notified if a metric is present. 

To further clarify your requirement: what do you mean exactly by a present metric and how do you imagine the most interesting use case for that situation, step by step?