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diff --git a/src/messages/MOSDPGLog.h b/src/messages/MOSDPGLog.h
new file mode 100644
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+++ b/src/messages/MOSDPGLog.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_MOSDPGLOG_H
+#define CEPH_MOSDPGLOG_H
+
+#include "messages/MOSDPeeringOp.h"
+#include "osd/PGPeeringEvent.h"
+
+class MOSDPGLog final : public MOSDPeeringOp {
+private:
+  static constexpr int HEAD_VERSION = 6;
+  static constexpr int COMPAT_VERSION = 5;
+
+  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.
+  epoch_t query_epoch = 0;
+
+public:
+  shard_id_t to;
+  shard_id_t from;
+  pg_info_t info;
+  pg_log_t log;
+  pg_missing_t missing;
+  PastIntervals past_intervals;
+  std::optional<pg_lease_t> lease;
+
+  epoch_t get_epoch() const { return epoch; }
+  spg_t get_pgid() const { return spg_t(info.pgid.pgid, to); }
+  epoch_t get_query_epoch() const { return query_epoch; }
+
+  spg_t get_spg() const override {
+    return spg_t(info.pgid.pgid, to);
+  }
+  epoch_t get_map_epoch() const override {
+    return epoch;
+  }
+  epoch_t get_min_epoch() const override {
+    return query_epoch;
+  }
+
+  PGPeeringEvent *get_event() override {
+    return new PGPeeringEvent(
+      epoch, query_epoch,
+      MLogRec(pg_shard_t(get_source().num(), from),
+	      this),
+      true,
+      new PGCreateInfo(
+	get_spg(),
+	query_epoch,
+	info.history,
+	past_intervals,
+	false));
+  }
+
+  MOSDPGLog() : MOSDPeeringOp{MSG_OSD_PG_LOG, HEAD_VERSION, COMPAT_VERSION} {
+    set_priority(CEPH_MSG_PRIO_HIGH); 
+  }
+  MOSDPGLog(shard_id_t to, shard_id_t from,
+	    version_t mv, const pg_info_t& i, epoch_t query_epoch)
+    : MOSDPeeringOp{MSG_OSD_PG_LOG, HEAD_VERSION, COMPAT_VERSION},
+      epoch(mv), query_epoch(query_epoch),
+      to(to), from(from),
+      info(i)  {
+    set_priority(CEPH_MSG_PRIO_HIGH);
+  }
+
+private:
+  ~MOSDPGLog() final {}
+
+public:
+  std::string_view get_type_name() const override { return "PGlog"; }
+  void inner_print(std::ostream& out) const override {
+    // NOTE: log is not const, but operator<< doesn't touch fields
+    // swapped out by OSD code.
+    out << "log " << log
+	<< " pi " << past_intervals;
+    if (lease) {
+      out << " " << *lease;
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(epoch, payload);
+    encode(info, payload);
+    encode(log, payload);
+    encode(missing, payload, features);
+    if (!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
+      // pre-nautilus OSDs do not set last_peering_reset properly
+      encode(epoch, payload);
+    } else {
+      encode(query_epoch, payload);
+    }
+    encode(past_intervals, payload);
+    encode(to, payload);
+    encode(from, payload);
+    encode(lease, payload);
+  }
+  void decode_payload() override {
+    using ceph::decode;
+    auto p = payload.cbegin();
+    decode(epoch, p);
+    decode(info, p);
+    log.decode(p, info.pgid.pool());
+    missing.decode(p, info.pgid.pool());
+    decode(query_epoch, p);
+    decode(past_intervals, p);
+    decode(to, p);
+    decode(from, p);
+    if (header.version >= 6) {
+      decode(lease, p);
+    }
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif