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diff --git a/src/messages/MMonCommand.h b/src/messages/MMonCommand.h
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+++ b/src/messages/MMonCommand.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_MMONCOMMAND_H
+#define CEPH_MMONCOMMAND_H
+
+#include "common/cmdparse.h"
+#include "messages/PaxosServiceMessage.h"
+
+#include <vector>
+#include <string>
+
+class MMonCommand : public MessageInstance<MMonCommand, PaxosServiceMessage> {
+public:
+  friend factory;
+
+  uuid_d fsid;
+  std::vector<std::string> cmd;
+
+  MMonCommand() : MessageInstance(MSG_MON_COMMAND, 0) {}
+  MMonCommand(const uuid_d &f)
+    : MessageInstance(MSG_MON_COMMAND, 0),
+      fsid(f)
+  { }
+
+private:
+  ~MMonCommand() override {}
+
+public:  
+  std::string_view get_type_name() const override { return "mon_command"; }
+  void print(ostream& o) const override {
+    cmdmap_t cmdmap;
+    stringstream ss;
+    string prefix;
+    cmdmap_from_json(cmd, &cmdmap, ss);
+    cmd_getval(g_ceph_context, cmdmap, "prefix", prefix);
+    // Some config values contain sensitive data, so don't log them
+    o << "mon_command(";
+    if (prefix == "config set") {
+      string name;
+      cmd_getval(g_ceph_context, cmdmap, "name", name);
+      o << "[{prefix=" << prefix << ", name=" << name << "}]";
+    } else if (prefix == "config-key set") {
+      string key;
+      cmd_getval(g_ceph_context, cmdmap, "key", key);
+      o << "[{prefix=" << prefix << ", key=" << key << "}]";
+    } else {
+      for (unsigned i=0; i<cmd.size(); i++) {
+        if (i) o << ' ';
+        o << cmd[i];
+      }
+    }
+    o << " v " << version << ")";
+  }
+  
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    paxos_encode();
+    encode(fsid, payload);
+    encode(cmd, payload);
+  }
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    paxos_decode(p);
+    decode(fsid, p);
+    decode(cmd, p);
+  }
+};
+
+#endif