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diff --git a/src/messages/MMonProbe.h b/src/messages/MMonProbe.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_MMONPROBE_H
+#define CEPH_MMONPROBE_H
+
+#include "include/ceph_features.h"
+#include "msg/Message.h"
+#include "mon/MonMap.h"
+
+class MMonProbe : public MessageInstance<MMonProbe> {
+public:
+  friend factory;
+
+  static constexpr int HEAD_VERSION = 7;
+  static constexpr int COMPAT_VERSION = 5;
+
+  enum {
+    OP_PROBE = 1,
+    OP_REPLY = 2,
+    OP_SLURP = 3,
+    OP_SLURP_LATEST = 4,
+    OP_DATA = 5,
+    OP_MISSING_FEATURES = 6,
+  };
+
+  static const char *get_opname(int o) {
+    switch (o) {
+    case OP_PROBE: return "probe";
+    case OP_REPLY: return "reply";
+    case OP_SLURP: return "slurp";
+    case OP_SLURP_LATEST: return "slurp_latest";
+    case OP_DATA: return "data";
+    case OP_MISSING_FEATURES: return "missing_features";
+    default: ceph_abort(); return 0;
+    }
+  }
+  
+  uuid_d fsid;
+  int32_t op = 0;
+  string name;
+  set<int32_t> quorum;
+  bufferlist monmap_bl;
+  version_t paxos_first_version = 0;
+  version_t paxos_last_version = 0;
+  bool has_ever_joined = 0;
+  uint64_t required_features = 0;
+  uint8_t mon_release = 0;
+
+  MMonProbe()
+    : MessageInstance(MSG_MON_PROBE, HEAD_VERSION, COMPAT_VERSION) {}
+  MMonProbe(const uuid_d& f, int o, const string& n, bool hej, uint8_t mr)
+    : MessageInstance(MSG_MON_PROBE, HEAD_VERSION, COMPAT_VERSION),
+      fsid(f),
+      op(o),
+      name(n),
+      paxos_first_version(0),
+      paxos_last_version(0),
+      has_ever_joined(hej),
+      required_features(0),
+      mon_release(mr) {}
+private:
+  ~MMonProbe() override {}
+
+public:  
+  std::string_view get_type_name() const override { return "mon_probe"; }
+  void print(ostream& out) const override {
+    out << "mon_probe(" << get_opname(op) << " " << fsid << " name " << name;
+    if (quorum.size())
+      out << " quorum " << quorum;
+    if (op == OP_REPLY) {
+      out << " paxos("
+	<< " fc " << paxos_first_version
+	<< " lc " << paxos_last_version
+	<< " )";
+    }
+    if (!has_ever_joined)
+      out << " new";
+    if (required_features)
+      out << " required_features " << required_features;
+    if (mon_release)
+      out << " mon_release " << (int)mon_release;
+    out << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if (monmap_bl.length() &&
+	((features & CEPH_FEATURE_MONENC) == 0 ||
+	 (features & CEPH_FEATURE_MSG_ADDR2) == 0)) {
+      // reencode old-format monmap
+      MonMap t;
+      t.decode(monmap_bl);
+      monmap_bl.clear();
+      t.encode(monmap_bl, features);
+    }
+
+    encode(fsid, payload);
+    encode(op, payload);
+    encode(name, payload);
+    encode(quorum, payload);
+    encode(monmap_bl, payload);
+    encode(has_ever_joined, payload);
+    encode(paxos_first_version, payload);
+    encode(paxos_last_version, payload);
+    encode(required_features, payload);
+    encode(mon_release, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(op, p);
+    decode(name, p);
+    decode(quorum, p);
+    decode(monmap_bl, p);
+    decode(has_ever_joined, p);
+    decode(paxos_first_version, p);
+    decode(paxos_last_version, p);
+    if (header.version >= 6)
+      decode(required_features, p);
+    else
+      required_features = 0;
+    if (header.version >= 7)
+      decode(mon_release, p);
+    else
+      mon_release = 0;
+  }
+};
+
+#endif