just a handy fish function to make logs [app] [namespace] find a pod that matches metadata.app=[app] in [namespace] and produce logs for it

logs.fish

function logs
    if test (count $argv) -ge 2
        set app $argv[1]
        set namespace $argv[2]
    else
        echo "You must provide two arguments… `logs [app] [namespace]`"
        return 2
    end

    kubectl logs (kubectl get pods -l app=$app -o jsonpath="{.items[0].metadata.name}" -n $namespace) -n $namespace -f
end

In bash this would be something close to alias logs='kubectl logs (kubectl get pods -l app=$1 -o jsonpath="{.items[0].metadata.name}" -n $2) -n $2 -f'