title: AWS Lambda .NET Core ENV variables naming
body: <p>I have a .NET Core AWS Lambda function and I need to specify
  log level for specific classes or namespaces and I need to do it via Environment Variable: <code>Logging__LogLevel__Out.Internal.Class</code> with Value <code>debug</code></p>
  <p>However, I am getting an validation error:</p>
  <p><code>The key must start with a letter and can only contain letters, numbers, and underscores.</code></p>
  <p>Is there any workaroung?</p>
  <p>Thanks</p>