How can I make a Grafana template with a variable reference another variable using Prometheus as a datasource?

You can reference the first variable in the second variables query. I'm not certain if there is a way using the label_values helper though.

First variable
query: up
regex: /.*app="([^"]*).*/

Second variable:
query: up{app="$app"}
regex: /.*instance="([^"]*).*/

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label_values works just fine using variables. For ex:

label_values(cassandra_keyspace_readlatency_count{product="$product"}, keyspace)

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