--- /dev/null	2020-01-17 11:46:19.065201212 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahMonitoringSupport.hpp	2020-01-17 17:10:23.145129761 +0100
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2015, 2017, Red Hat, Inc. All rights reserved.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHMONITORINGSUPPORT_HPP
+#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHMONITORINGSUPPORT_HPP
+
+#include "memory/allocation.hpp"
+
+class GenerationCounters;
+class HSpaceCounters;
+class ShenandoahHeap;
+class CollectorCounters;
+class ShenandoahHeapRegionCounters;
+
+class ShenandoahMonitoringSupport : public CHeapObj<mtGC> {
+private:
+  CollectorCounters*   _partial_counters;
+  CollectorCounters*   _full_counters;
+
+  GenerationCounters* _young_counters;
+  GenerationCounters* _heap_counters;
+
+  HSpaceCounters* _space_counters;
+
+  ShenandoahHeapRegionCounters* _heap_region_counters;
+
+public:
+ ShenandoahMonitoringSupport(ShenandoahHeap* heap);
+ CollectorCounters* stw_collection_counters();
+ CollectorCounters* full_stw_collection_counters();
+ CollectorCounters* concurrent_collection_counters();
+ CollectorCounters* partial_collection_counters();
+ void update_counters();
+};
+
+#endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHMONITORINGSUPPORT_HPP