diff --git a/src/WebJobs.Script.WebHost/Security/KeyManagement/ScriptSecrets.cs b/src/WebJobs.Script.WebHost/Security/KeyManagement/ScriptSecrets.cs
index f68fc975c0..f9bbbcc209 100644
--- a/src/WebJobs.Script.WebHost/Security/KeyManagement/ScriptSecrets.cs
+++ b/src/WebJobs.Script.WebHost/Security/KeyManagement/ScriptSecrets.cs
@@ -4,9 +4,11 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using Microsoft.Azure.WebJobs.Script.Config;
 using Newtonsoft.Json;
 
 namespace Microsoft.Azure.WebJobs.Script.WebHost
@@ -15,6 +17,9 @@ public abstract class ScriptSecrets
     {
         protected ScriptSecrets()
         {
+            HostName = ScriptSettingsManager.Instance.GetSetting(EnvironmentSettingNames.AzureWebsiteHostName);
+            InstanceId = ScriptSettingsManager.Instance.InstanceId;
+            Source = ScriptConstants.Runtime;
         }
 
         [JsonIgnore]
@@ -23,6 +28,15 @@ protected ScriptSecrets()
         [JsonIgnore]
         public abstract ScriptSecretsType SecretsType { get; }
 
+        [JsonProperty(PropertyName = "hostName")]
+        public string HostName { get; set; }
+
+        [JsonProperty(PropertyName = "instanceId")]
+        public string InstanceId { get; set; }
+
+        [JsonProperty(PropertyName = "source")]
+        public string Source { get; set; }
+
         protected abstract ICollection<Key> GetKeys(string keyScope);
 
         public abstract ScriptSecrets Refresh(IKeyValueConverterFactory factory);
diff --git a/src/WebJobs.Script/Config/ScriptSettingsManager.cs b/src/WebJobs.Script/Config/ScriptSettingsManager.cs
index 9ee01890c2..36aa2a9346 100644
--- a/src/WebJobs.Script/Config/ScriptSettingsManager.cs
+++ b/src/WebJobs.Script/Config/ScriptSettingsManager.cs
@@ -76,6 +76,17 @@ public virtual string AzureWebsiteUniqueSlotName
             }
         }
 
+        public virtual string InstanceId
+         {
+             get
+             {
+                 string instanceId = GetSetting(EnvironmentSettingNames.AzureWebsiteInstanceId)
+                     ?? Environment.MachineName.GetHashCode().ToString("X").PadLeft(32, '0');
+
+                 return instanceId.Substring(0, 32);
+             }
+         }
+
         public virtual string ApplicationInsightsInstrumentationKey
         {
             get => GetSettingFromCache(EnvironmentSettingNames.AppInsightsInstrumentationKey);
diff --git a/src/WebJobs.Script/Host/ScriptHost.cs b/src/WebJobs.Script/Host/ScriptHost.cs
index 3d08dabbae..dfd282f933 100644
--- a/src/WebJobs.Script/Host/ScriptHost.cs
+++ b/src/WebJobs.Script/Host/ScriptHost.cs
@@ -122,10 +122,7 @@ public string InstanceId
             {
                 if (_instanceId == null)
                 {
-                    _instanceId = _settingsManager.GetSetting(EnvironmentSettingNames.AzureWebsiteInstanceId)
-                        ?? Environment.MachineName.GetHashCode().ToString("X").PadLeft(32, '0');
-
-                    _instanceId = _instanceId.Substring(0, 32);
+                    _instanceId = _settingsManager.InstanceId;
                 }
 
                 return _instanceId;
diff --git a/src/WebJobs.Script/ScriptConstants.cs b/src/WebJobs.Script/ScriptConstants.cs
index 5b8d283305..6a1edd5adf 100644
--- a/src/WebJobs.Script/ScriptConstants.cs
+++ b/src/WebJobs.Script/ScriptConstants.cs
@@ -70,6 +70,7 @@ public static class ScriptConstants
         public static readonly ImmutableArray<string> HttpMethods = ImmutableArray.Create("get", "post", "delete", "head", "patch", "put", "options");
         public const string HttpMethodConstraintName = "httpMethod";
         public static readonly ImmutableArray<string> AssemblyFileTypes = ImmutableArray.Create(".dll", ".exe");
+        public const string Runtime = "runtime";
 
         public const int MaximumHostIdLength = 32;
         public const int DynamicSkuConnectionLimit = 50;
diff --git a/test/WebJobs.Script.Tests/Security/ScriptSecretSerializerV1Tests.cs b/test/WebJobs.Script.Tests/Security/ScriptSecretSerializerV1Tests.cs
index 3893fc522a..6e0bc80ce8 100644
--- a/test/WebJobs.Script.Tests/Security/ScriptSecretSerializerV1Tests.cs
+++ b/test/WebJobs.Script.Tests/Security/ScriptSecretSerializerV1Tests.cs
@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Microsoft.Azure.WebJobs.Script.Config;
 using Microsoft.Azure.WebJobs.Script.WebHost;
 using Newtonsoft.Json.Linq;
 using Xunit;
@@ -40,16 +41,23 @@ public void SerializeFunctionSecrets_ReturnsExpectedResult()
 
             var jsonObject = JObject.Parse(serializedSecret);
             var serializedSecrets = jsonObject.Property("keys")?.Value?.ToObject<List<Key>>();
+            var source = jsonObject.Property("source")?.Value;
+            var hostName = jsonObject.Property("hostName")?.Value;
+            var instanceId = jsonObject.Property("instanceId")?.Value;
 
             Assert.NotNull(serializedSecret);
             AssertKeyCollectionsEquality(secrets.Keys, serializedSecrets);
+            Assert.Equal(source, secrets.Source);
+            Assert.Equal(hostName, secrets.HostName);
+            Assert.Equal(instanceId, secrets.InstanceId);
         }
 
-        [Fact]
-        public void DeserializeFunctionSecrets_ReturnsExpectedResult()
+        [Theory]
+        [InlineData("{ 'keys': [ { 'name': 'Key1', 'value': 'Value1', 'encrypted': false }, { 'name': 'Key2', 'value': 'Value2', 'encrypted': true } ] }", null)]
+        [InlineData("{ 'keys': [ { 'name': 'Key1', 'value': 'Value1', 'encrypted': false }, { 'name': 'Key2', 'value': 'Value2', 'encrypted': true } ], 'hostName': 'test', 'source': 'runtime'}", "test")]
+        public void DeserializeFunctionSecrets_ReturnsExpectedResult(string serializedSecret, string hostName)
         {
             var serializer = new ScriptSecretSerializerV1();
-            var serializedSecret = "{ 'keys': [ { 'name': 'Key1', 'value': 'Value1', 'encrypted': false }, { 'name': 'Key2', 'value': 'Value2', 'encrypted': true } ] }";
             var expected = new List<Key>
             {
                 new Key
@@ -67,14 +75,16 @@ public void DeserializeFunctionSecrets_ReturnsExpectedResult()
             };
 
             FunctionSecrets actual = serializer.DeserializeSecrets<FunctionSecrets>(JObject.Parse(serializedSecret));
+            Assert.Equal(hostName, actual.HostName);
             AssertKeyCollectionsEquality(expected, actual.Keys);
         }
 
-        [Fact]
-        public void DeserializeHostSecrets_ReturnsExpectedResult()
+        [Theory]
+        [InlineData("{'masterKey':{'name':'master','value':'1234','encrypted':false},'functionKeys':[{'name':'Key1','value':'Value1','encrypted':false},{'name':'Key2','value':'Value2','encrypted':true}]}", null)]
+        [InlineData("{'masterKey':{'name':'master','value':'1234','encrypted':false},'functionKeys':[{'name':'Key1','value':'Value1','encrypted':false},{'name':'Key2','value':'Value2','encrypted':true}],  'hostName': 'test', 'source': 'runtime' }", "test")]
+        public void DeserializeHostSecrets_ReturnsExpectedResult(string serializedSecret, string hostName)
         {
             var serializer = new ScriptSecretSerializerV1();
-            var serializedSecret = "{'masterKey':{'name':'master','value':'1234','encrypted':false},'functionKeys':[{'name':'Key1','value':'Value1','encrypted':false},{'name':'Key2','value':'Value2','encrypted':true}]}";
             var expected = new HostSecrets
             {
                 MasterKey = new Key { Name = "master", Value = "1234" },
@@ -92,13 +102,16 @@ public void DeserializeHostSecrets_ReturnsExpectedResult()
                         Value = "Value2",
                         IsEncrypted = true
                     }
-                }
+                },
+                HostName = hostName
             };
 
             HostSecrets actual = serializer.DeserializeSecrets<HostSecrets>(JObject.Parse(serializedSecret));
 
             Assert.NotNull(actual);
             Assert.Equal(expected.MasterKey, actual.MasterKey);
+            Assert.Equal(actual.HostName, hostName);
+            Assert.Equal(expected.Source, ScriptConstants.Runtime);
             AssertKeyCollectionsEquality(expected.FunctionKeys, actual.FunctionKeys);
         }
 
@@ -132,10 +145,12 @@ public void SerializeHostSecrets_ReturnsExpectedResult()
             var jsonObject = JObject.Parse(serializedSecret);
             var functionSecrets = jsonObject.Property("functionKeys")?.Value?.ToObject<List<Key>>();
             var masterKey = jsonObject.Property("masterKey")?.Value?.ToObject<Key>();
+            var instanceId = jsonObject.Property("instanceId")?.Value;
 
             Assert.NotNull(serializedSecret);
             Assert.Equal(secrets.MasterKey, masterKey);
             AssertKeyCollectionsEquality(secrets.FunctionKeys, functionSecrets);
+            Assert.Equal(instanceId, secrets.InstanceId);
         }
 
         [Theory]
@@ -143,6 +158,7 @@ public void SerializeHostSecrets_ReturnsExpectedResult()
         [InlineData(typeof(FunctionSecrets), false, "{'key':'functionKeySecretString'}")]
         [InlineData(typeof(HostSecrets), true, "{'masterKey': {'name': 'master','value': '1234','encrypted': false},'functionKeys': [{'name': 'Key1','value': 'Value1','encrypted': false},{'name': 'Key2','value': 'Value2','encrypted': true}]}")]
         [InlineData(typeof(FunctionSecrets), true, "{'keys': [{'name': 'Key1','value': 'Value1','encrypted': false},{'name': 'Key2','value': 'Value2','encrypted': true}]}")]
+        [InlineData(typeof(HostSecrets), false, "{'masterKey': 'masterKeySecretString','functionKey': 'functionKeySecretString', 'hostName': 'test1', 'instanceId': 'test2', 'source': 'test3'}")]
         public void CanSerialize_WithValidHostPayload_ReturnsTrue(Type type, bool expectedResult, string input)
         {
             var serializer = new ScriptSecretSerializerV1();