"no data" when dividing metrics in browser

[athenapaas]

Both metrics are scraped from cAdvisor. I am trying to calculate percentage of memory available by dividing these metrics.

Is this a bug?

[brian-brazil]

This is the correct behaviour as the id label differs between the two sets of time series. http://www.robustperception.io/using-group_left-to-calculate-label-proportions/ should help you.

[athenapaas]

Many thanks. It makes sense.

Just in case if anybody care, here is what gives correct result ceil(container_memory_usage_bytes{id="/"} / on (instance) machine_memory_bytes *100)

[lock]

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