Adds a ColdBootType so we can detect and work with that if we have our own custom callbacks

src/Umbraco.Core/Sync/ColdBootType.cs

@@ -0,0 +1,24 @@
+namespace Umbraco.Core.Sync
+{
+    /// <summary>
+    /// The type of Cold Boot taking place
+    /// </summary>
+    public enum ColdBootType
+    {
+        /// <summary>
+        /// Indicates there was no cold boot
+        /// </summary>
+        NoColdBoot,
+
+        /// <summary>
+        /// This indicates that there is no lasysynced file for the current machine/appid
+        /// </summary>
+        NeverSynced,
+
+        /// <summary>
+        /// This indicates that the number of instructions needing to be processed exceeds the value stored 
+        /// for the <see cref="DatabaseServerMessengerOptions.MaxProcessingInstructionCount"/>
+        /// </summary>
+        ExceedsMaxProcessingInstructionCount
+    }
+}

src/Umbraco.Core/Sync/DatabaseServerMessenger.cs

@@ -43,6 +43,11 @@ namespace Umbraco.Core.Sync
         protected DatabaseServerMessengerOptions Options { get; private set; }
         protected ApplicationContext ApplicationContext { get { return _appContext; } }
 
+        /// <summary>
+        /// Returns the cold boot type detected for the current app domain
+        /// </summary>
+        public ColdBootType ColdBootType { get; private set; }
+
         public DatabaseServerMessenger(ApplicationContext appContext, bool distributedEnabled, DatabaseServerMessengerOptions options)
             : base(distributedEnabled)
         {
@@ -146,11 +151,12 @@ namespace Umbraco.Core.Sync
         /// </remarks>
         private void Initialize()
         {
+            ColdBootType = ColdBootType.NoColdBoot;
+
             lock (_locko)
             {
                 if (_released) return;
-
+                
-                var coldboot = false;
                 if (_lastId < 0) // never synced before
                 {
                     // we haven't synced - in this case we aren't going to sync the whole thing, we will assume this is a new
@@ -159,7 +165,7 @@ namespace Umbraco.Core.Sync
                         + " The server will build its caches and indexes, and then adjust its last synced Id to the latest found in"
                         + " the database and maintain cache updates based on that Id.");
 
-                    coldboot = true;
+                    ColdBootType = ColdBootType.NeverSynced;
                 }
                 else
                 {
@@ -175,11 +181,11 @@ namespace Umbraco.Core.Sync
                             + " to the latest found in the database and maintain cache updates based on that Id.",
                             () => count, () => Options.MaxProcessingInstructionCount);
 
-                        coldboot = true;
+                        ColdBootType = ColdBootType.ExceedsMaxProcessingInstructionCount;
                     }
                 }
 
-                if (coldboot)
+                if (ColdBootType != ColdBootType.NoColdBoot)
                 {
                     // go get the last id in the db and store it
                     // note: do it BEFORE initializing otherwise some instructions might get lost

src/Umbraco.Core/Umbraco.Core.csproj

@@ -1311,6 +1311,7 @@
     <Compile Include="Strings\ContentBaseExtensions.cs" />
     <Compile Include="Strings\Diff.cs" />
     <Compile Include="Sync\BatchedWebServiceServerMessenger.cs" />
+    <Compile Include="Sync\ColdBootType.cs" />
     <Compile Include="Sync\IServerRegistrar2.cs" />
     <Compile Include="Sync\ServerRole.cs" />
     <Compile Include="Sync\DatabaseServerMessenger.cs" />