Remove double quotes from source_labels value with gsub
Remove double quotes from source_labels value with gsub

The value in source_labels have to be without quotes, but sometimes you
have to use brackets in the value and puppet surrounds it with double
quotes.

So we need to replace the double quotes with nothing in the template

mdebruyn-trip/puppet-prometheus,dhoppe/puppet-prometheus,dhoppe/puppet-prometheus,mdebruyn-trip/puppet-prometheus,mdebruyn-trip/puppet-prometheus,dhoppe/puppet-prometheus