Add process tags to telemetry (#7780)

## Summary of changes

add processtags to the body of telemetry requests, as part of the
application data.

equivalent of DataDog/dd-trace-java#8837

## Reason for change

[AIDM-195]

## Implementation details

pretty straightforward.

## Test coverage

relies on snapshots

## 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.

MergeQueue is NOT enabled in this repository. If you have write access
to the repo, the PR has 1-2 approvals (see above), and all of the
required checks have passed, you can use the Squash and Merge button to
merge the PR. If you don't have write access, or you need help, reach
out in the #apm-dotnet channel in Slack.
-->


[AIDM-195]:
https://datadoghq.atlassian.net/browse/AIDM-195?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: vandonr

tracer/src/Datadog.Trace/Telemetry/Collectors/ApplicationTelemetryCollector.cs

@@ -30,6 +30,12 @@ public void RecordTracerSettings(
             Interlocked.Exchange(ref _gitMetadata, gitMetadata);
         }
 
+        string? processTags = null;
+        if (tracerSettings.PropagateProcessTags && !string.IsNullOrEmpty(ProcessTags.SerializedTags))
+        {
+            processTags = ProcessTags.SerializedTags;
+        }
+
         var frameworkDescription = FrameworkDescription.Instance;
         var application = new ApplicationTelemetryData(
             serviceName: defaultServiceName,
@@ -41,7 +47,8 @@ public void RecordTracerSettings(
             runtimeName: frameworkDescription.Name,
             runtimeVersion: frameworkDescription.ProductVersion,
             commitSha: gitMetadata?.CommitSha,
-            repositoryUrl: gitMetadata?.RepositoryUrl);
+            repositoryUrl: gitMetadata?.RepositoryUrl,
+            processTags: processTags);
 
         Interlocked.Exchange(ref _applicationData, application);
 
@@ -95,7 +102,8 @@ public void RecordGitMetadata(GitMetadata gitMetadata)
                 runtimeName: original.RuntimeName,
                 runtimeVersion: original.RuntimeVersion,
                 commitSha: gitMetadata.CommitSha,
-                repositoryUrl: gitMetadata.RepositoryUrl);
+                repositoryUrl: gitMetadata.RepositoryUrl,
+                processTags: original.ProcessTags);
 
             var updated = Interlocked.Exchange(ref _applicationData, application);
             if (updated == original)

tracer/src/Datadog.Trace/Telemetry/DTOs/ApplicationTelemetryData.cs

@@ -9,7 +9,7 @@ namespace Datadog.Trace.Telemetry;
 
 internal class ApplicationTelemetryData
 {
-    public ApplicationTelemetryData(string serviceName, string env, string serviceVersion, string tracerVersion, string languageName, string languageVersion, string runtimeName, string runtimeVersion, string? commitSha, string? repositoryUrl)
+    public ApplicationTelemetryData(string serviceName, string env, string serviceVersion, string tracerVersion, string languageName, string languageVersion, string runtimeName, string runtimeVersion, string? commitSha, string? repositoryUrl, string? processTags)
     {
         ServiceName = serviceName;
         Env = env;
@@ -21,6 +21,7 @@ public ApplicationTelemetryData(string serviceName, string env, string serviceVe
         RuntimeVersion = runtimeVersion;
         CommitSha = commitSha;
         RepositoryUrl = repositoryUrl;
+        ProcessTags = processTags;
     }
 
     public string ServiceName { get; set; }
@@ -44,4 +45,6 @@ public ApplicationTelemetryData(string serviceName, string env, string serviceVe
     public string? CommitSha { get; set; }
 
     public string? RepositoryUrl { get; set; }
+
+    public string? ProcessTags { get; set; }
 }

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/Helpers/TelemetryHelperTests.cs

@@ -40,7 +40,8 @@ public TelemetryHelperTests(ITestOutputHelper output)
             runtimeName: "dotnet",
             runtimeVersion: "7.0.1",
             commitSha: "testCommitSha",
-            repositoryUrl: "testRepositoryUrl");
+            repositoryUrl: "testRepositoryUrl",
+            processTags: "entrypoint.basedir:Users,entrypoint.workdir:Downloads");
         _host = new HostTelemetryData("MY_HOST", "Windows", "x64");
         _output = output;
     }

tracer/test/Datadog.Trace.IntegrationTests/TelemetryTransportTests.cs

@@ -167,7 +167,8 @@ private static TelemetryData GetSampleData() =>
                     runtimeName: "dotnet",
                     runtimeVersion: "7.0.3",
                     commitSha: "aaaaaaaaaaaaaaaaaa",
-                    repositoryUrl: "https://github.com/myOrg/myRepo"),
+                    repositoryUrl: "https://github.com/myOrg/myRepo",
+                    processTags: "entrypoint.basedir:Users,entrypoint.workdir:Downloads"),
                 host: new HostTelemetryData("SOME_HOST", "Windows", "x64"),
                 payload: null);
 

tracer/test/Datadog.Trace.Tests/Telemetry/TelemetryDataBuilderTests.cs

@@ -34,7 +34,8 @@ public TelemetryDataBuilderTests()
             runtimeName: FrameworkDescription.Instance.Name,
             runtimeVersion: FrameworkDescription.Instance.ProductVersion,
             commitSha: "testCommitSha",
-            repositoryUrl: "testRepositoryUrl");
+            repositoryUrl: "testRepositoryUrl",
+            processTags: "entrypoint.basedir:Users,entrypoint.workdir:Downloads");
         _host = new HostTelemetryData("MY_MACHINE", "Windows", "arm64");
     }
 

tracer/test/Datadog.Trace.Tests/Telemetry/Transports/JsonTelemetryTransportTests.cs

@@ -37,7 +37,8 @@ public void SerializedAppStartedShouldProduceJsonWithExpectedFormat()
                     runtimeName: "dotnet",
                     runtimeVersion: "7.0.3",
                     commitSha: "testCommitSha",
-                    repositoryUrl: "testRepositoryUrl"),
+                    repositoryUrl: "testRepositoryUrl",
+                    processTags: "entrypoint.basedir:Users,entrypoint.workdir:Downloads"),
                 host: new HostTelemetryData(
                     hostname: "i-09ecf74c319c49be8",
                     os: "GNU/Linux",
@@ -100,7 +101,8 @@ public void SerializedMetricsTelemetryShouldProduceJsonWithExpectedFormat()
                     runtimeName: "dotnet",
                     runtimeVersion: "7.0.3",
                     commitSha: "testCommitSha",
-                    repositoryUrl: "testRepositoryUrl"),
+                    repositoryUrl: "testRepositoryUrl",
+                    processTags: "entrypoint.basedir:Users,entrypoint.workdir:Downloads"),
                 host: new HostTelemetryData(
                     hostname: "i-09ecf74c319c49be8",
                     os: "GNU/Linux",
@@ -171,7 +173,8 @@ public void SerializedDistributionMetricsTelemetryShouldProduceJsonWithExpectedF
                     runtimeName: "dotnet",
                     runtimeVersion: "7.0.3",
                     commitSha: "testCommitSha",
-                    repositoryUrl: "testRepositoryUrl"),
+                    repositoryUrl: "testRepositoryUrl",
+                    processTags: "entrypoint.basedir:Users,entrypoint.workdir:Downloads"),
                 host: new HostTelemetryData(
                     hostname: "i-09ecf74c319c49be8",
                     os: "GNU/Linux",
@@ -237,7 +240,8 @@ public void SerializedMessageBatchShouldProduceJsonWithExpectedFormat()
                     runtimeName: "dotnet",
                     runtimeVersion: "7.0.3",
                     commitSha: "testCommitSha",
-                    repositoryUrl: "testRepositoryUrl"),
+                    repositoryUrl: "testRepositoryUrl",
+                    processTags: "entrypoint.basedir:Users,entrypoint.workdir:Downloads"),
                 host: new HostTelemetryData(
                     hostname: "i-09ecf74c319c49be8",
                     os: "GNU/Linux",

tracer/test/Datadog.Trace.Tests/Telemetry/telemetry_app-started.json

@@ -15,7 +15,8 @@
     "runtime_name": "dotnet",
     "runtime_version": "7.0.3",
     "commit_sha": "testCommitSha",
-    "repository_url": "testRepositoryUrl"
+    "repository_url": "testRepositoryUrl",
+    "process_tags": "entrypoint.basedir:Users,entrypoint.workdir:Downloads"
   },
   "host": {
     "hostname": "i-09ecf74c319c49be8",

tracer/test/Datadog.Trace.Tests/Telemetry/telemetry_distributions.json

@@ -14,7 +14,8 @@
     "runtime_name": "dotnet",
     "runtime_version": "7.0.3",
     "commit_sha": "testCommitSha",
-    "repository_url": "testRepositoryUrl"
+    "repository_url": "testRepositoryUrl",
+    "process_tags": "entrypoint.basedir:Users,entrypoint.workdir:Downloads"
   },
   "host": {
     "hostname": "i-09ecf74c319c49be8",

tracer/test/Datadog.Trace.Tests/Telemetry/telemetry_generate-metrics.json

@@ -14,7 +14,8 @@
     "runtime_name": "dotnet",
     "runtime_version": "7.0.3",
     "commit_sha": "testCommitSha",
-    "repository_url": "testRepositoryUrl"
+    "repository_url": "testRepositoryUrl",
+    "process_tags": "entrypoint.basedir:Users,entrypoint.workdir:Downloads"
   },
   "host": {
     "hostname": "i-09ecf74c319c49be8",

tracer/test/Datadog.Trace.Tests/Telemetry/telemetry_message-batch.json

@@ -15,7 +15,8 @@
     "runtime_name": "dotnet",
     "runtime_version": "7.0.3",
     "commit_sha": "testCommitSha",
-    "repository_url": "testRepositoryUrl"
+    "repository_url": "testRepositoryUrl",
+    "process_tags": "entrypoint.basedir:Users,entrypoint.workdir:Downloads"
   },
   "host": {
     "hostname": "i-09ecf74c319c49be8",