Is there a recommendation to use VisualCron to check disk space on servers?

For lack of proper monitoring, I would like to setup something to check disk space and curious if there was a recommendation.

Thanks

Use the Performance counter Trigger to start a Job based on diskspace reaching a certaing value.

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That works well to set off the trigger, but how do you capture the value?
I tested by creating a disk % Free <= 50% as the trigger and then send an email. Inserting the actual free space % in the email is the key, I don't see it as a variable.

Where can I find this?

These Variables have been added for upcoming 8.2.0 version:

{TRIGGER(Active|LastTrigger|PerformanceCounter.Result.LastValue)}
{TRIGGER(Active|LastTrigger|PerformanceCounter.Result.AverageValue)}
{TRIGGER(Active|LastTrigger|PerformanceCounter.Result.ExpectedValue)}

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trying to create this monitoring function.
Is this possible like in the screenshot? (best practice?)
Or do i need to make separated jobs?

{TRIGGER(Active|LastTrigger|Desc|)}

{TRIGGER(Active|LastTrigger|PerformanceCounter.Result.LastValue)}
{TRIGGER(Active|LastTrigger|PerformanceCounter.Result.ExpectedValue)}


when using this how can i change the numbers behind the comma?
because i get this as result;
Performance counter Trigger. Monitoring performance counter '% Free Space->C:' at 'bouw-app1' - if Less 75

56,5006637573242
75