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diff --git a/src/messages/MOSDPGNotify.h b/src/messages/MOSDPGNotify.h
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+++ b/src/messages/MOSDPGNotify.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MOSDPGPEERNOTIFY_H
+#define CEPH_MOSDPGPEERNOTIFY_H
+
+#include "msg/Message.h"
+
+#include "osd/osd_types.h"
+
+/*
+ * PGNotify - notify primary of my PGs and versions.
+ */
+
+class MOSDPGNotify : public MessageInstance<MOSDPGNotify> {
+public:
+  friend factory;
+private:
+  static constexpr int HEAD_VERSION = 6;
+  static constexpr int COMPAT_VERSION = 6;
+
+  epoch_t epoch = 0;
+  /// query_epoch is the epoch of the query being responded to, or
+  /// the current epoch if this is not being sent in response to a
+  /// query. This allows the recipient to disregard responses to old
+  /// queries.
+  vector<pair<pg_notify_t,PastIntervals> > pg_list;   // pgid -> version
+
+ public:
+  version_t get_epoch() const { return epoch; }
+  const vector<pair<pg_notify_t,PastIntervals> >& get_pg_list() const {
+    return pg_list;
+  }
+
+  MOSDPGNotify()
+    : MessageInstance(MSG_OSD_PG_NOTIFY, HEAD_VERSION, COMPAT_VERSION) { 
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+  MOSDPGNotify(epoch_t e, vector<pair<pg_notify_t,PastIntervals> >& l)
+    : MessageInstance(MSG_OSD_PG_NOTIFY, HEAD_VERSION, COMPAT_VERSION),
+      epoch(e) {
+    pg_list.swap(l);
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+private:
+  ~MOSDPGNotify() override {}
+
+public:  
+  std::string_view get_type_name() const override { return "PGnot"; }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(pg_list, payload);
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(pg_list, p);
+  }
+  void print(ostream& out) const override {
+    out << "pg_notify(";
+    for (auto i = pg_list.begin();
+         i != pg_list.end();
+         ++i) {
+      if (i != pg_list.begin())
+	out << " ";
+      out << i->first << "=" << i->second;
+    }
+    out << " epoch " << epoch
+	<< ")";
+  }
+};
+
+#endif