[FileBasedConfiguration] Support for temporality_preference in Console Metric Exporter (#4745)

Author: ysolomchenko

CHANGELOG.md

@@ -20,6 +20,8 @@ This component adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.h
 - Automatically set the `service.instance.id` resource attribute if not provided.
 - Support for [CoreWCF.Primitives](https://www.nuget.org/packages/CoreWCF.Primitives/)
   traces instrumentation for versions `1.8.0`+.
+- Support for `temporality_preference` in file-based configuration
+  for Console Metric Exporter.
 
 ### Changed
 

docs/file-based-configuration.md

@@ -264,6 +264,10 @@ meter_provider:
         exporter:
           # Configure exporter to be console.
           console:
+            # Configure temporality preference.
+            # Values include: cumulative, delta.
+            # If omitted or null, cumulative is used.
+            temporality_preference: cumulative
 
     # Pull reader for Prometheus
     - pull:

src/OpenTelemetry.AutoInstrumentation/Configurations/EnvironmentConfigurationMetricHelper.cs

@@ -139,7 +139,7 @@ private static MeterProviderBuilder SetExporter(this MeterProviderBuilder builde
                         }
                         else if (exporter.Console != null)
                         {
-                            builder = Wrappers.AddConsoleExporter(builder, pluginManager);
+                            builder = Wrappers.AddConsoleExporter(builder, pluginManager, exporter.Console);
                         }
                     }
 
@@ -249,6 +249,17 @@ public static MeterProviderBuilder AddConsoleExporter(MeterProviderBuilder build
             });
         }
 
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        public static MeterProviderBuilder AddConsoleExporter(MeterProviderBuilder builder, PluginManager pluginManager, ConsoleExporterConfig consoleExporterConfig)
+        {
+            return builder.AddConsoleExporter((consoleExporterOptions, metricReaderOptions) =>
+            {
+                metricReaderOptions.TemporalityPreference = consoleExporterConfig.GetTemporalityPreference();
+                pluginManager.ConfigureMetricsOptions(consoleExporterOptions);
+                pluginManager.ConfigureMetricsOptions(metricReaderOptions);
+            });
+        }
+
         [MethodImpl(MethodImplOptions.NoInlining)]
         public static MeterProviderBuilder AddPrometheusHttpListener(MeterProviderBuilder builder, PluginManager pluginManager)
         {

src/OpenTelemetry.AutoInstrumentation/Configurations/FileBasedConfiguration/ConsoleExporterConfig.cs

@@ -0,0 +1,30 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+using OpenTelemetry.AutoInstrumentation.Configurations.FileBasedConfiguration.Parser;
+using OpenTelemetry.Metrics;
+using Vendors.YamlDotNet.Serialization;
+
+namespace OpenTelemetry.AutoInstrumentation.Configurations.FileBasedConfiguration;
+
+[EmptyObjectOnEmptyYaml]
+internal class ConsoleExporterConfig
+{
+    /// <summary>
+    /// Gets or sets the temporality preference for the exporter.
+    /// Values include: cumulative, delta.
+    /// If omitted or null, cumulative is used.
+    /// </summary>
+    [YamlMember(Alias = "temporality_preference")]
+    public string? TemporalityPreference { get; set; }
+
+    public MetricReaderTemporalityPreference GetTemporalityPreference()
+    {
+        return TemporalityPreference switch
+        {
+            "cumulative" => MetricReaderTemporalityPreference.Cumulative,
+            "delta" => MetricReaderTemporalityPreference.Delta,
+            _ => MetricReaderTemporalityPreference.Cumulative
+        };
+    }
+}

src/OpenTelemetry.AutoInstrumentation/Configurations/FileBasedConfiguration/MetricPeriodicExporterConfig.cs

@@ -1,6 +1,8 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
+using OpenTelemetry.AutoInstrumentation.Configurations.FileBasedConfiguration.Parser;
+using OpenTelemetry.Metrics;
 using Vendors.YamlDotNet.Serialization;
 
 namespace OpenTelemetry.AutoInstrumentation.Configurations.FileBasedConfiguration;
@@ -23,5 +25,5 @@ internal class MetricPeriodicExporterConfig
     /// Gets or sets the console exporter configuration.
     /// </summary>
     [YamlMember(Alias = "console")]
-    public object? Console { get; set; }
+    public ConsoleExporterConfig? Console { get; set; }
 }

test/OpenTelemetry.AutoInstrumentation.Tests/Configurations/FileBased/Files/TestMetricsFile.yaml

@@ -17,6 +17,7 @@ meter_provider:
     - periodic:
         exporter:
           console:
+            temporality_preference: delta
     - pull:
         exporter:
           prometheus:

test/OpenTelemetry.AutoInstrumentation.Tests/Configurations/FileBased/Parser/ParserMetricsTests.cs

@@ -44,6 +44,7 @@ public void Parse_FullConfigYaml_ShouldPopulateModelCorrectly()
         Assert.NotNull(consoleReader);
         Assert.NotNull(consoleReader.Exporter);
         Assert.NotNull(consoleReader.Exporter!.Console);
+        Assert.Equal("delta", consoleReader.Exporter.Console.TemporalityPreference);
 
         var prometheusReader = config.MeterProvider.Readers[3].Pull;
         Assert.NotNull(prometheusReader);