Collection the data metrics where there are unique keys

You’re going to need to provide more information. Is this a batchscript datasource? What does your discovery look like? 

Your output will need to change if it’s batchscript. 

It’ll probably need to look something like:

SPID651.blocked: 0

SPID673.blocked: 0

This makes assumptions since you didn’t provide any of the required details. Assuming you want separate instances for each line in your output and assuming blocked is the single datapoint you want to store for each of these instances.