code: func (pmc *proxyMetricsCollector) BlobPull(bytesPulled uint64) {
  	atomic.AddUint64(&pmc.blobMetrics.Misses, 1)
  	atomic.AddUint64(&pmc.blobMetrics.BytesPulled, bytesPulled)
  }
docs: // BlobPull tracks metrics about blobs pulled into the cache