Revert "Add Google Protobuf Instrumentation (#6166)" (#6642)

## Summary of changes

This reverts commit 02d20a4.

## Reason for change

This has broken the master build, so reverting to unblock the pipeline 

## Implementation details

## Test coverage

## Other details
<!-- Fixes #{issue} -->

<!-- ⚠️ Note: where possible, please obtain 2 approvals prior to
merging. Unless CODEOWNERS specifies otherwise, for external teams it is
typically best to have one review from a team member, and one review
from apm-dotnet. Trivial changes do not require 2 reviews. -->

.gitignore

@@ -326,9 +326,6 @@ BenchmarkDotNet.Artifacts/
 # NServiceBus files
 .learningtransport
 
-# protobuf file generate on compile
-tracer/test/test-applications/integrations/Samples.GoogleProtobuf/Sample.cs
-
 ## Tracer .gitignore settings
 # Tracer deployment artifacts
 tracer/deploy/linux/

Datadog.Trace.OSX.slnf

@@ -101,7 +101,6 @@
       "tracer\\test\\test-applications\\integrations\\Samples.Elasticsearch.V7\\Samples.Elasticsearch.V7.csproj",
       "tracer\\test\\test-applications\\integrations\\Samples.Elasticsearch\\Samples.Elasticsearch.csproj",
       "tracer\\test\\test-applications\\integrations\\Samples.FakeDbCommand\\Samples.FakeDbCommand.csproj",
-      "tracer\\test\\test-applications\\integrations\\Samples.GoogleProtobuf\\Samples.GoogleProtobuf.csproj",
       "tracer\\test\\test-applications\\integrations\\Samples.GraphQL3\\Samples.GraphQL3.csproj",
       "tracer\\test\\test-applications\\integrations\\Samples.GraphQL4\\Samples.GraphQL4.csproj",
       "tracer\\test\\test-applications\\integrations\\Samples.GraphQL7\\Samples.GraphQL7.csproj",

Datadog.Trace.Samples.g.sln

@@ -433,8 +433,6 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.AzureFunctions.V4Is
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.AzureFunctions.V4Isolated.AspNetCore", "tracer\test\test-applications\azure-functions\Samples.AzureFunctions.V4Isolated.AspNetCore\Samples.AzureFunctions.V4Isolated.AspNetCore.csproj", "{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.GoogleProtobuf", "tracer\test\test-applications\integrations\Samples.GoogleProtobuf\Samples.GoogleProtobuf.csproj", "{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}"
-EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -1041,10 +1039,6 @@ Global
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}.Release|Any CPU.Build.0 = Release|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{9518425A-36A5-4B8F-B0B8-6137DB88441D} = {8CEC2042-F11C-49F5-A674-2355793B600A}
@@ -1217,6 +1211,5 @@ Global
 		{18767A3E-9ADC-485C-A8C7-50660D5B579D} = {C4C1E313-C7C1-4490-AECE-0DD0062380A4}
 		{5D2C6B9C-FCE2-4E46-B4ED-BC3B11CFBB3C} = {C4C1E313-C7C1-4490-AECE-0DD0062380A4}
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77} = {C4C1E313-C7C1-4490-AECE-0DD0062380A4}
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9} = {BAF8F246-3645-42AD-B1D0-0F7EAFBAB34A}
 	EndGlobalSection
 EndGlobal

Datadog.Trace.sln

@@ -603,8 +603,6 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.AzureFunctions.V4Is
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.AzureFunctions.V4Isolated.AspNetCore", "tracer\test\test-applications\azure-functions\Samples.AzureFunctions.V4Isolated.AspNetCore\Samples.AzureFunctions.V4Isolated.AspNetCore.csproj", "{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Samples.GoogleProtobuf", "tracer\test\test-applications\integrations\Samples.GoogleProtobuf\Samples.GoogleProtobuf.csproj", "{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}"
-EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -1449,10 +1447,6 @@ Global
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77}.Release|Any CPU.Build.0 = Release|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -1688,7 +1682,6 @@ Global
 		{18767A3E-9ADC-485C-A8C7-50660D5B579D} = {C4C1E313-C7C1-4490-AECE-0DD0062380A4}
 		{5D2C6B9C-FCE2-4E46-B4ED-BC3B11CFBB3C} = {C4C1E313-C7C1-4490-AECE-0DD0062380A4}
 		{0F8EAB52-0C5B-4F60-92C5-42FAC21F4E77} = {C4C1E313-C7C1-4490-AECE-0DD0062380A4}
-		{EF8C4CCE-E79C-4D78-BF31-222A11E198B9} = {BAF8F246-3645-42AD-B1D0-0F7EAFBAB34A}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {160A1D00-1F5B-40F8-A155-621B4459D78F}

docs/development/DuckTyping.md

@@ -315,7 +315,7 @@ DuckType.CreateTypeResult proxyResult = DuckType.GetOrCreateProxyType(proxyTarge
 if (proxyResult.Success)
 {
     // Pass in null, as there's no "instance" to duck type here
-    return proxyResult.CreateInstance(null!);
+    return proxyResult.CreateInstance(null);
 }
 else
 {
@@ -355,7 +355,7 @@ DuckType.CreateTypeResult proxyResult = DuckType.GetOrCreateProxyType(proxyType,
 if (proxyResult.Success)
 {
     // Pass in null, as there's no "instance" to duck type here, to create an instance of our proxy
-    var proxy = (IObjectFactoryProxy)proxyResult.CreateInstance(null!);
+    var proxy = (IObjectFactoryProxy)proxyResult.CreateInstance(null);
 
     // invoke methods on the proxy
     object obj = proxy.CreateObject();

tracer/build/PackageVersionsGeneratorDefinitions.json

@@ -230,16 +230,6 @@
       "ExcludeTargetFrameworks": ["netcoreapp2.1", "netcoreapp3.0"]
     }]
   },
-  {
-    "IntegrationName": "Protobuf",
-    "SampleProjectName": "Samples.GoogleProtobuf",
-    "NugetPackageSearchName": "Google.Protobuf",
-    "MinVersion": "3.0.0",
-    "MaxVersionExclusive": "4.0.0",
-    "SpecificVersions": [
-      "3.*.*"
-    ]
-  },
   {
     "IntegrationName": "RabbitMQ",
     "SampleProjectName": "Samples.RabbitMQ",

tracer/build/_build/Build.ExplorationTests.cs

@@ -645,13 +645,7 @@ public static ExplorationTestDescription GetExplorationTestDescription(Explorati
                     "Google.Protobuf.CodedInputStreamTest.MaliciousRecursion",
                     "Google.Protobuf.CodedInputStreamTest.MaliciousRecursion_UnknownFields",
                     "Google.Protobuf.CodedInputStreamTest.RecursionLimitAppliedWhileSkippingGroup",
-                    "Google.Protobuf.JsonParserTest.MaliciousRecursion",
-                    // exclude those "legacy" tests because they are on manually modified code
-                    // that throws a NotImplementedException on the `Descriptor` property that we use.
-                    "Google.Protobuf.LegacyGeneratedCodeTest.IntermixingOfNewAndLegacyGeneratedCodeWorksWithCodedInputStream",
-                    "Google.Protobuf.LegacyGeneratedCodeTest.IntermixingOfNewAndLegacyGeneratedCodeWorksWithCodedOutputStream",
-                    "Google.Protobuf.LegacyGeneratedCodeTest.LegacyGeneratedCodeThrowsWithIBufferWriter",
-                    "Google.Protobuf.LegacyGeneratedCodeTest.LegacyGeneratedCodeThrowsWithReadOnlySequence"
+                    "Google.Protobuf.JsonParserTest.MaliciousRecursion"
                 },
                 LineProbesEnabled = true
             },

tracer/build/supported_calltargets.g.json

@@ -11743,102 +11743,6 @@
     "IsAdoNetIntegration": false,
     "InstrumentationCategory": 1
   },
-  {
-    "IntegrationName": "Protobuf",
-    "AssemblyName": "Google.Protobuf",
-    "TargetTypeName": "Google.Protobuf.IBufferMessage",
-    "TargetMethodName": "InternalMergeFrom",
-    "TargetReturnType": "System.Void",
-    "TargetParameterTypes": [
-      "Google.Protobuf.ParseContext&"
-    ],
-    "MinimumVersion": {
-      "Item1": 3,
-      "Item2": 15,
-      "Item3": 0
-    },
-    "MaximumVersion": {
-      "Item1": 3,
-      "Item2": 65535,
-      "Item3": 65535
-    },
-    "InstrumentationTypeName": "Datadog.Trace.ClrProfiler.AutoInstrumentation.Protobuf.BufferMessageInternalMergeFromIntegration",
-    "IntegrationKind": 2,
-    "IsAdoNetIntegration": false,
-    "InstrumentationCategory": 1
-  },
-  {
-    "IntegrationName": "Protobuf",
-    "AssemblyName": "Google.Protobuf",
-    "TargetTypeName": "Google.Protobuf.IBufferMessage",
-    "TargetMethodName": "InternalWriteTo",
-    "TargetReturnType": "System.Void",
-    "TargetParameterTypes": [
-      "Google.Protobuf.WriteContext&"
-    ],
-    "MinimumVersion": {
-      "Item1": 3,
-      "Item2": 15,
-      "Item3": 0
-    },
-    "MaximumVersion": {
-      "Item1": 3,
-      "Item2": 65535,
-      "Item3": 65535
-    },
-    "InstrumentationTypeName": "Datadog.Trace.ClrProfiler.AutoInstrumentation.Protobuf.BufferMessageInternalWriteToIntegration",
-    "IntegrationKind": 2,
-    "IsAdoNetIntegration": false,
-    "InstrumentationCategory": 1
-  },
-  {
-    "IntegrationName": "Protobuf",
-    "AssemblyName": "Google.Protobuf",
-    "TargetTypeName": "Google.Protobuf.IMessage",
-    "TargetMethodName": "MergeFrom",
-    "TargetReturnType": "System.Void",
-    "TargetParameterTypes": [
-      "Google.Protobuf.CodedInputStream"
-    ],
-    "MinimumVersion": {
-      "Item1": 3,
-      "Item2": 0,
-      "Item3": 0
-    },
-    "MaximumVersion": {
-      "Item1": 3,
-      "Item2": 65535,
-      "Item3": 65535
-    },
-    "InstrumentationTypeName": "Datadog.Trace.ClrProfiler.AutoInstrumentation.Protobuf.MessageMergeFromIntegration",
-    "IntegrationKind": 2,
-    "IsAdoNetIntegration": false,
-    "InstrumentationCategory": 1
-  },
-  {
-    "IntegrationName": "Protobuf",
-    "AssemblyName": "Google.Protobuf",
-    "TargetTypeName": "Google.Protobuf.IMessage",
-    "TargetMethodName": "WriteTo",
-    "TargetReturnType": "System.Void",
-    "TargetParameterTypes": [
-      "Google.Protobuf.CodedOutputStream"
-    ],
-    "MinimumVersion": {
-      "Item1": 3,
-      "Item2": 0,
-      "Item3": 0
-    },
-    "MaximumVersion": {
-      "Item1": 3,
-      "Item2": 65535,
-      "Item3": 65535
-    },
-    "InstrumentationTypeName": "Datadog.Trace.ClrProfiler.AutoInstrumentation.Protobuf.MessageWriteToIntegration",
-    "IntegrationKind": 2,
-    "IsAdoNetIntegration": false,
-    "InstrumentationCategory": 1
-  },
   {
     "IntegrationName": "RabbitMQ",
     "AssemblyName": "RabbitMQ.Client",

tracer/missing-nullability-files.csv

@@ -226,6 +226,7 @@ src/Datadog.Trace/Util/ArraySlice.cs
 src/Datadog.Trace/Util/AsyncUtil.cs
 src/Datadog.Trace/Util/Clock.cs
 src/Datadog.Trace/Util/DomainMetadata.cs
+src/Datadog.Trace/Util/FnvHash64.cs
 src/Datadog.Trace/Util/IClock.cs
 src/Datadog.Trace/Util/IRandomIdGenerator.cs
 src/Datadog.Trace/Util/RandomIdGenerator.Net6.cs