analytics

Many people use Newrelic . But why ? What are the usefulness of this tool. If i install this will it eat huge amount of my vps resource ... ? And they are offering forever free account with no server limit ... Will they be able to see server datas ? I am just concerned about it ..... Also my...

I have been using piwik for some time and i got that super useful. Except one error i get in System Check. I am just curious what does it says..... What is that Thing and how to solve this ? Note:That Database user is not root,created by ispconfig.