title: App Engine: Using f1-micro instance but getting billed for g1-small instance
body: <p>We have a flexible environment (node.js) running with one f1-micro (1 vCPU, 0.6 GB memory) instance. When I look at the Billing History, I can see that we get billed for "Compute Engine Small instance with 1 VCPU" with the price of a g1-small instance. </p>
  
  <p>We're still in the 60 days free trial period, so we are still using the credit.</p>
  
  <p>But I'm wondering why we get billed for the g1-small instance if we are using f1-micro?</p>