What do your clients want to know?  Collect data on that.

That said, at a minimum I would collect (per web page):


Number of first-page views.
Number of pages viewed until abandonment (user leaves site).  This can be graphed to give an idea of how long people stay on the site.
Number of view per page.  Which pages are attracting more interest than others?


Stats will differ depending on whether it is a web app or web page.  Most sites are a combination of both; Amazon is a web page until you want to buy something, then it is a web app.

It wouldn't surprise me if it turned out that most websites have certain "hot spots," i.e. pages that are overwhelmingly viewed more than others.  Your clients want to know things like that, so they can attempt to reproduce the attraction effect for other pages/products.

What kind of metrics should I collect for a website/web app
How can I use a jQuery UI Spinner widget in Knockout bound input?

    &lt;tbody data-bind="foreach: orders"&gt;
        &lt;tr&gt;
            &lt;td data-bind="text: Name"&gt;&lt;/td&gt;
            &lt;td&gt;&lt;input type="number" style="width: 100px;" data-bind="value: Price" /&gt;&lt;/td&gt;
            &lt;td&gt;&lt;input type="number" style="width: 50px;" data-bind="value: VAT" /&gt;&lt;/td&gt;
            &lt;td&gt;&lt;input type="number" style="width: 50px;" data-bind="value: Number" /&gt;&lt;/td&gt;
            &lt;td data-bind="text: Final()"&gt;&lt;/td&gt;
            &lt;td&gt;&lt;a href="javascript:void(0);" data-bind="click: $root.removeOrder"&gt;Remove&lt;/a&gt;&lt;/td&gt;
        &lt;/tr&gt;    
    &lt;/tbody&gt;

