1 files changed, 34 insertions, 0 deletions
diff --git a/src/accounting/Helpers.cs b/src/accounting/Helpers.cs
new file mode 100644
index 0000000..d167aae
--- /dev/null
+++ b/src/accounting/Helpers.cs
@@ -0,0 +1,34 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+using System.Collections;
+
+namespace Accounting
+{
+    internal static class Helpers
+    {
+        private static List<string> RelevantPrefixes = ["DOTNET_", "CORECLR_", "OTEL_", "KAFKA_"];
+
+        public static IEnumerable<DictionaryEntry> FilterRelevant(this IDictionary envs)
+        {
+            foreach (DictionaryEntry env in envs)
+            {
+                foreach (var prefix in RelevantPrefixes)
+                {
+                    if (env.Key.ToString()?.StartsWith(prefix, StringComparison.InvariantCultureIgnoreCase) ?? false)
+                    {
+                        yield return env;
+                    }
+                }
+            }
+        }
+
+        public static void OutputInOrder(this IEnumerable<DictionaryEntry> envs)
+        {
+            foreach (var env in envs.OrderBy(x => x.Key))
+            {
+                Console.WriteLine(env);
+            }
+        }
+    }
+}