[ethbro]

Haven't read the paper yet, but could you expand on the tuple use? It seems like the odd person out in that list of primatives.

[xyse53]

They are used when joining timeseries.

[jeffbee]

A join creates a tuple but that's not the only way to use them. You can also just produce a tuple with an expression in the query such as (val(), 5, "dog") if you like. The whole language is documented here:

https://cloud.google.com/monitoring/mql/reference