Can you give a specific example? The solution in general is to make the labels align, e.g. see here <https://www.robustperception.io/controlling-the-instance-label> for the instance label. There is also label_replace() <https://prometheus.io/docs/prometheus/latest/querying/functions/#label_replace> if you can modify the labels using regexp matches. At worst, you would create a third, static timeseries with appropriate labels to join the other two timeseries onto, similar to the approach here <https://www.robustperception.io/how-to-have-labels-for-machine-roles> and here <https://www.robustperception.io/exposing-the-software-version-to-prometheus> .
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