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diff --git a/src/messages/MOSDPGNotify.h b/src/messages/MOSDPGNotify.h
new file mode 100644
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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 final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 7;
+  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.
+  using pg_list_t = std::vector<pg_notify_t>;
+  pg_list_t pg_list;
+
+ public:
+  version_t get_epoch() const { return epoch; }
+  const pg_list_t& get_pg_list() const {
+    return pg_list;
+  }
+
+  MOSDPGNotify()
+    : MOSDPGNotify(0, {})
+  {}
+  MOSDPGNotify(epoch_t e, pg_list_t&& l)
+    : Message{MSG_OSD_PG_NOTIFY, HEAD_VERSION, COMPAT_VERSION},
+      epoch(e),
+      pg_list(std::move(l)) {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+private:
+  ~MOSDPGNotify() final {}
+
+public:  
+  std::string_view get_type_name() const override { return "PGnot"; }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    header.version = HEAD_VERSION;
+    encode(epoch, payload);
+    if (!HAVE_FEATURE(features, SERVER_OCTOPUS)) {
+      // pretend to be vector<pair<pg_notify_t,PastIntervals>>
+      header.version = 6;
+      encode((uint32_t)pg_list.size(), payload);
+      for (auto& i : pg_list) {
+	encode(i, payload);   // this embeds a dup (ignored) PastIntervals
+	encode(i.past_intervals, payload);
+      }
+      return;
+    }
+    encode(pg_list, payload);
+  }
+
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    using ceph::decode;
+    decode(epoch, p);
+    if (header.version == 6) {
+      // decode legacy vector<pair<pg_notify_t,PastIntervals>>
+      uint32_t num;
+      decode(num, p);
+      pg_list.resize(num);
+      for (unsigned i = 0; i < num; ++i) {
+	decode(pg_list[i], p);
+	decode(pg_list[i].past_intervals, p);
+      }
+      return;
+    }
+    decode(pg_list, p);
+  }
+  void print(std::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;
+    }
+    out << " epoch " << epoch
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif