How to display all metrics that don't have a specific label

Question

I want to select all metrics that don't have label "container". Is there any possibility to do that with prometheus query?

Answer 1

Try this:

{__name__=~".+",container=""}

There needs to be at least one non-empty matcher (hence the + in the __name__ regular expression, * wouldn't cut it). And the way you query for a missing label is by checking for equality with the empty string.