topic Re: Operation on metric obtained in EF2 extensions? in Extensions

Operation on metric obtained in EF2 extensions

AntonioSousa — Fri, 10 May 2024 14:23:50 GMT

In EF2, typically I have seen that when there is a need to convert the value of a metric, it is done with a "key: func" definition.

Is it safe to do the calculation with the metric. And if so, how is it done, as I have found no example?

Re: Operation on metric obtained in EF2 extensions?

Mike_L — Sat, 23 Mar 2024 23:04:58 GMT

Hi Antonio,

Which data source are you using? They do not all have the same functionality.

In general, using a metric selector in the dashboard/alert/UA section is always possible.

Re: Operation on metric obtained in EF2 extensions?

AntonioSousa — Sat, 23 Mar 2024 20:36:06 GMT

@Mike_L,

It's WMI. Value is a multiple of 100, so I would like to ingest the real value, dividing it by 100 first...

Re: Operation on metric obtained in EF2 extensions?

Mike_L — Sat, 23 Mar 2024 23:04:00 GMT

For that data source you can't do anything in the data source (with SQL you can handle it by adjusting your query). You'd have to handle it in the metric metadata section, such as this:

metrics: - key: my_old_metric metadata: displayName: My Old Metric description: My Old metric, it is large unit: Count - key: func:my_new_metric metadata: displayName: My New Metric description: My Old metric, but divided by 100 unit: Count query: metricSelector: (my_old_metric)/(100)

Re: Operation on metric obtained in EF2 extensions?

AntonioSousa — Sun, 24 Mar 2024 14:31:57 GMT

Thanks @Mike_L ,

It was the "key: func" I was referring to...

I believe it consumes 0.002 DDUs, because it's two data points, right? Because I'll be ingesting a lot of them, I'll maybe have to go with the value and then do calculations in the UI...

Re: Operation on metric obtained in EF2 extensions?

Mike_L — Mon, 25 Mar 2024 18:46:29 GMT

Key function metrics only provide an easy way to do metric selectors. They don’t actually store any data, so they don’t consume DDUs.

Re: Operation on metric obtained in EF2 extensions?

AntonioSousa — Mon, 25 Mar 2024 19:25:03 GMT

That's very good to know. Didn't know. Thanks @Mike_L !