MAC_STAT(cache_hitpass, uint64_t, "u", "Cache hits for pass")
MAC_STAT(cache_miss, uint64_t, "u", "Cache misses")
-MAC_STAT(backend_conn, uint64_t, "u", "Backend connections initiated")
+MAC_STAT(backend_conn, uint64_t, "u", "Backend connections success")
+MAC_STAT(backend_fail, uint64_t, "u", "Backend connections failures")
+MAC_STAT(backend_reuse, uint64_t, "u", "Backend connections reuses")
MAC_STAT(backend_recycle, uint64_t, "u", "Backend connections recycles")
MAC_STAT(backend_unused, uint64_t, "u", "Backend connections unused")