Moved a couple of folders and wrote some code

Assets/Packages/FishNet/Runtime/Managing/Debugging/DebugManager.cs

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+using UnityEngine;
+
+namespace FishNet.Managing.Debugging
+{
+    /// <summary>
+    /// A container for debugging.
+    /// </summary>
+    [DisallowMultipleComponent]
+    [AddComponentMenu("FishNet/Manager/DebugManager")]
+    public class DebugManager : MonoBehaviour
+    {
+        public bool ObserverRpcLinks = true;
+        public bool TargetRpcLinks = true;
+        public bool ReplicateRpcLinks = true;
+        public bool ReconcileRpcLinks = true;
+        public bool ServerRpcLinks = true;
+    }
+
+
+}

Assets/Packages/FishNet/Runtime/Managing/Debugging/DebugManager.cs.meta

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Assets/Packages/FishNet/Runtime/Managing/Debugging/ParseLogger.cs

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+#if UNITY_EDITOR || DEVELOPMENT_BUILD
+using FishNet.Managing.Logging;
+using FishNet.Object;
+using FishNet.Serializing;
+using FishNet.Transporting;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using UnityEngine;
+
+namespace FishNet.Managing.Debugging
+{
+
+    internal class ParseLogger
+    {
+        /// <summary>
+        /// Contains the last several non-split packets to arrive. This is used for debugging.
+        /// </summary>
+        private Queue<PacketId> _incomingPacketIds = new Queue<PacketId>();
+        /// <summary>
+        /// Maximum number of packets allowed to be queued.
+        /// </summary>
+        private const int PACKET_COUNT = 5;
+
+        /// <summary>
+        /// Resets data.
+        /// </summary>
+        internal void Reset()
+        {
+            _incomingPacketIds.Clear();
+        }
+
+        /// <summary>
+        /// Adds a packet to data.
+        /// </summary>
+        /// <param name="pId"></param>
+        internal void AddPacket(PacketId pId)
+        {
+            _incomingPacketIds.Enqueue(pId);
+            if (_incomingPacketIds.Count > PACKET_COUNT)
+                _incomingPacketIds.Dequeue();
+        }
+
+        /// <summary>
+        /// Prints current data.
+        /// </summary>
+        internal void Print(NetworkManager nm)
+        {
+            if (nm == null)
+                nm = InstanceFinder.NetworkManager;
+
+            //Only log if a NM was found.
+            if (nm != null)
+            {
+                StringBuilder sb = new StringBuilder();
+                foreach (PacketId item in _incomingPacketIds)
+                    sb.Insert(0, $"{item.ToString()}{Environment.NewLine}");
+
+                NetworkObject lastNob = Reader.LastNetworkObject;
+                string nobData = (lastNob == null) ? "Unset" : $"Id {lastNob.ObjectId} on gameObject {lastNob.name}";
+                NetworkBehaviour lastNb = Reader.LastNetworkBehaviour;
+                string nbData = (lastNb == null) ? "Unset" : lastNb.GetType().Name;
+
+                nm.LogError($"The last {_incomingPacketIds.Count} packets to arrive are: {Environment.NewLine}{sb.ToString()}");
+                nm.LogError($"The last parsed NetworkObject is {nobData}, and NetworkBehaviour {nbData}.");
+            }
+
+            Reset();
+        }
+    }
+
+}
+#endif

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