Improve log output some more.

go/vt/vttablet/grpctabletconn/conn.go

@@ -120,7 +120,7 @@ func (conn *gRPCQueryClient) Execute(ctx context.Context, target *querypb.Target
 	conn.mu.RLock()
 	defer conn.mu.RUnlock()
 	if conn.cc == nil {
-		throttledLogger.Errorf("vttablet: Connection Closed (alias: %v, type: )", conn.tablet.Alias, conn.tablet.Type)
+		throttledLogger.Errorf("Execute: vttablet: Connection Closed (tablet: {%v}, target: {%v}, query: {%v})", conn.tablet, target, query)
 		return nil, tabletconn.ConnClosed
 	}