switch process tags on by default

tracer/src/Datadog.Trace/Configuration/TracerSettings.cs

@@ -33,7 +33,7 @@ namespace Datadog.Trace.Configuration
     public partial record TracerSettings
     {
         private static readonly IDatadogLogger Log = DatadogLogging.GetLoggerFor<TracerSettings>();
-        private static readonly HashSet<string> DefaultExperimentalFeatures = ["DD_TAGS", ConfigurationKeys.PropagateProcessTags];
+        private static readonly HashSet<string> DefaultExperimentalFeatures = ["DD_TAGS"];
 
         private readonly Lazy<string> _fallbackApplicationName;
 
@@ -87,7 +87,7 @@ internal TracerSettings(IConfigurationSource? source, IConfigurationTelemetry te
 
             PropagateProcessTags = config
                                        .WithKeys(ConfigurationKeys.PropagateProcessTags)
-                                       .AsBool(ExperimentalFeaturesEnabled.Contains(ConfigurationKeys.PropagateProcessTags)); // read it as "defaults to false"
+                                       .AsBool(true);
 
             GCPFunctionSettings = new ImmutableGCPFunctionSettings(source, telemetry);
             IsRunningInGCPFunctions = GCPFunctionSettings.IsGCPFunction;

tracer/src/Datadog.Trace/Configuration/supported-configurations.yaml

@@ -766,9 +766,9 @@ supportedConfigurations:
     const_name: UseUnsafeEncoder
     documentation: Use new unsafe encoder for the waf
   DD_EXPERIMENTAL_PROPAGATE_PROCESS_TAGS_ENABLED:
-  - implementation: A
+  - implementation: B
     type: boolean
-    default: 'false'
+    default: 'true'
     const_name: PropagateProcessTags
     documentation: |-
       Enables propagation of process-level tags across traces. Type: `boolean`. Default: `false`

tracer/test/Datadog.Trace.Tests/Configuration/TracerSettingsTests.cs

@@ -1069,27 +1069,13 @@ public void OtlpLogsTimeoutMsFallback(string logsTimeout, string generalTimeout,
         }
 
         [Theory]
-        [MemberData(nameof(BooleanTestCases), false)]
+        [MemberData(nameof(BooleanTestCases), true)]
         public void ProcessTagsEnabled(string value, bool expected)
         {
             var source = CreateConfigurationSource((ConfigurationKeys.PropagateProcessTags, value));
             var settings = new TracerSettings(source);
 
             settings.PropagateProcessTags.Should().Be(expected);
         }
-
-        [Theory]
-        [InlineData(null, false)]
-        [InlineData("", false)]
-        [InlineData("none", false)]
-        [InlineData("all", true)]
-        [InlineData(ConfigurationKeys.PropagateProcessTags, true)]
-        public void ProcessTagsEnabledIfExperimentalEnabled(string value, bool expected)
-        {
-            var source = CreateConfigurationSource((ConfigurationKeys.ExperimentalFeaturesEnabled, value));
-            var settings = new TracerSettings(source);
-
-            settings.PropagateProcessTags.Should().Be(expected);
-        }
     }
 }