You can do a PromQL query like {__name__="foo|bar"} but that's messy if you
also want to filter on different labels for metrics foo and bar.
If you're only interested in the current values of each metric, then you
can query the /federate endpoint where you can provide the match[]
parameter multiple times with multiple queries.
https://prometheus.io/docs/prometheus/latest/federation/#configuring-federation
e.g.
curl -g
'prometheus:9090/federate?match[]=up&match[]={__name__=~"scrape_.*"}'
In any case, I wouldn't worry too much about inefficiency of separate
queries. The main time taken is reading out the data and formatting it;
whether that's done in a single query or spread over two queries isn't
going to make much difference. If you want to ensure that the table data
lines up to the same instant in time, then pick an instant and provide the
same time=xxx parameter to each separate query.
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