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diff --git a/src/messages/MMonElection.h b/src/messages/MMonElection.h
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+++ b/src/messages/MMonElection.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_MMONELECTION_H
+#define CEPH_MMONELECTION_H
+
+#include "msg/Message.h"
+#include "mon/MonMap.h"
+#include "mon/mon_types.h"
+
+class MMonElection : public MessageInstance<MMonElection> {
+public:
+  friend factory;
+
+private:
+  static constexpr int HEAD_VERSION = 8;
+  static constexpr int COMPAT_VERSION = 5;
+
+public:
+  static constexpr int OP_PROPOSE = 1;
+  static constexpr int OP_ACK     = 2;
+  static constexpr int OP_NAK     = 3;
+  static constexpr int OP_VICTORY = 4;
+  static const char *get_opname(int o) {
+    switch (o) {
+    case OP_PROPOSE: return "propose";
+    case OP_ACK: return "ack";
+    case OP_NAK: return "nak";
+    case OP_VICTORY: return "victory";
+    default: ceph_abort(); return 0;
+    }
+  }
+  
+  uuid_d fsid;
+  int32_t op;
+  epoch_t epoch;
+  bufferlist monmap_bl;
+  set<int32_t> quorum;
+  uint64_t quorum_features;
+  mon_feature_t mon_features;
+  uint8_t mon_release = 0;
+  bufferlist sharing_bl;
+  map<string,string> metadata;
+  
+  MMonElection() : MessageInstance(MSG_MON_ELECTION, HEAD_VERSION, COMPAT_VERSION),
+    op(0), epoch(0),
+    quorum_features(0),
+    mon_features(0)
+  { }
+
+  MMonElection(int o, epoch_t e, MonMap *m)
+    : MessageInstance(MSG_MON_ELECTION, HEAD_VERSION, COMPAT_VERSION),
+      fsid(m->fsid), op(o), epoch(e),
+      quorum_features(0),
+      mon_features(0)
+  {
+    // encode using full feature set; we will reencode for dest later,
+    // if necessary
+    m->encode(monmap_bl, CEPH_FEATURES_ALL);
+  }
+private:
+  ~MMonElection() override {}
+
+public:  
+  std::string_view get_type_name() const override { return "election"; }
+  void print(ostream& out) const override {
+    out << "election(" << fsid << " " << get_opname(op)
+	<< " rel " << (int)mon_release << " e" << epoch << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    if (monmap_bl.length() && (features != CEPH_FEATURES_ALL)) {
+      // 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(epoch, payload);
+    encode(monmap_bl, payload);
+    encode(quorum, payload);
+    encode(quorum_features, payload);
+    encode((version_t)0, payload);  // defunct
+    encode((version_t)0, payload);  // defunct
+    encode(sharing_bl, payload);
+    encode(mon_features, payload);
+    encode(metadata, payload);
+    encode(mon_release, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(fsid, p);
+    decode(op, p);
+    decode(epoch, p);
+    decode(monmap_bl, p);
+    decode(quorum, p);
+    decode(quorum_features, p);
+    {
+      version_t v;  // defunct fields from old encoding
+      decode(v, p);
+      decode(v, p);
+    }
+    decode(sharing_bl, p);
+    if (header.version >= 6)
+      decode(mon_features, p);
+    if (header.version >= 7)
+      decode(metadata, p);
+    if (header.version >= 8)
+      decode(mon_release, p);
+    else
+      mon_release = infer_ceph_release_from_mon_features(mon_features);
+  }
+  
+};
+
+#endif