Added missing file

Author: Ruben Cerna

src/Service/Telemetry/LogLevelInitializer.cs

@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using Azure.DataApiBuilder.Config;
+using Azure.DataApiBuilder.Config.ObjectModel;
+using Azure.DataApiBuilder.Core.Configurations;
+using Microsoft.Extensions.Logging;
+using static Azure.DataApiBuilder.Config.DabConfigEvents;
+
+namespace Azure.DataApiBuilder.Service.Telemetry
+{
+    public class LogLevelInitializer
+    {
+        private RuntimeConfigProvider? _runtimeConfigProvider;
+        private string _loggerFilter;
+
+        public LogLevel MinLogLevel { get; private set; }
+
+        public LogLevelInitializer(LogLevel logLevel, string loggerFilter, HotReloadEventHandler<HotReloadEventArgs>? handler)
+        {
+            handler?.Subscribe(LOG_LEVEL_INITIALIZER_ON_CONFIG_CHANGE, OnConfigChanged);
+            MinLogLevel = logLevel;
+            _loggerFilter = loggerFilter;
+        }
+
+        public void SetLogLevel()
+        {
+            if (_runtimeConfigProvider!.TryGetConfig(out RuntimeConfig? runtimeConfig))
+            {
+                MinLogLevel = RuntimeConfig.GetConfiguredLogLevel(runtimeConfig, _loggerFilter);
+            }
+        }
+
+        public void SetRuntimeConfigProvider(RuntimeConfigProvider configProvider)
+        {
+            _runtimeConfigProvider = configProvider;
+        }
+
+        private void OnConfigChanged(object? sender, HotReloadEventArgs args)
+        {
+            SetLogLevel();
+        }
+    }
+}