Doc metrics : unable to install curl

[yogeek]

Hello,

In the README, this command do not seem to be possible because of the missing root user :

kubectl -n kube-system exec -it ${DRAINO_POD} -- apk add curl
ERROR: Unable to lock database: Permission denied
ERROR: Failed to open apk database: Permission denied
command terminated with exit code 99

Does the documentation need to be updated ?
And how is it possible to view metrics please ?