title: ASP.NET Web API Logging and Tracing
body: <p>Once one has a logging and tracing setup using log4net in place for ASP.NET Web API, what are the specific aspects that need to be logged and/or traced?</p>
  
  <p>I am asking this specifically from Web API perspective. Is there a series of <strong>MUST Log this</strong> or <strong>MUST trace this</strong>.
  Like, INFO traces about a controller's request, any NULL checks, etc.</p>
  
  <p>Is there a reference list that can be validated against to ensure optimum logging and tracing coverage in ASP.NET Web API ?</p>