title: Tracking Google Cloud CDN cache hit rate
body: <p>I have a Google Cloud CDN set up for a Google Cloud Storage bucket, and everything seems to be working correctly.  When I check "Network services > Cloud CDN in the GCP console, I see my load balancer with the correct backend and a "Cache hit ratio".  The cache hit ratio moves about quite a lot and ranges between 0 and 90%.  While I understand that this will vary, I would still like to track the hit ratio.</p>
  
  <p>Using Stackdriver, I can monitor the load balancer, but I can't see any metric for "hit ratio" when looking into the load balancer.</p>
  
  <p>Is there a way to see a time series metric for "cache hit ratio" for a specific load balancer using Stackdriver (or any other method)?</p>