SCM_LOG
SCM_LOG(5, "no subchannel");
SCM_LOG(5, "no request");
SCM_LOG(5, "aidaw alloc failed");
SCM_LOG(1, "Request timeout");
SCM_LOG(1, "Request error");
SCM_LOG(1, "Retry request");
SCM_LOG(2, "State changed");
SCM_LOG(2, "Increment available");
SCM_LOG(2, "probe");