Remember that by default, an expression like
foo * bar
will only produce outputs for timeseries where both foo and bar have
exactly the same set of labels. So you can filter on one side only:
foo{namespace="xxx"} * bar
This gives the same result as:
foo{namespace="xxx"} * bar{namespace="xxx"}
and is shorter than your proposed
with_labels(namespace="xxx") (foo * bar)
You can also introduce a synthetic timeseries which always has value 1 to
do this (or 0, with + operator). This allows other tricks like copying
labels from this timeseries into the result timeseries.
https://www.robustperception.io/how-to-have-labels-for-machine-roles
https://www.robustperception.io/exposing-the-software-version-to-prometheus
https://prometheus.io/docs/prometheus/latest/querying/operators/#many-to-one-and-one-to-many-vector-matches
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