update scalemonitor and target scaler per functionid

Author: nytian

src/DurableTask.SqlServer.AzureFunctions/SqlDurabilityProvider.cs

@@ -201,7 +201,7 @@ public override bool TryGetScaleMonitor(
             {
                 this.singletonSqlMetricsProvider = new SqlMetricsProvider(this.service);
             }
-            scaleMonitor = new SqlScaleMonitor(hubName, this.singletonSqlMetricsProvider);
+            scaleMonitor = new SqlScaleMonitor(functionId, hubName, this.singletonSqlMetricsProvider);
 
             return true;
         }
@@ -219,7 +219,7 @@ public override bool TryGetTargetScaler(
                 this.singletonSqlMetricsProvider = new SqlMetricsProvider(this.service);
             }
 
-            targetScaler = new SqlTargetScaler(hubName, this.singletonSqlMetricsProvider);
+            targetScaler = new SqlTargetScaler(functionId,this.singletonSqlMetricsProvider);
             return true;
         }
 #endif

src/DurableTask.SqlServer.AzureFunctions/SqlScaleMonitor.cs

@@ -23,14 +23,14 @@ class SqlScaleMonitor : IScaleMonitor<SqlScaleMetric>
 
         int? previousWorkerCount = -1;
 
-        public SqlScaleMonitor(string taskHubName, SqlMetricsProvider sqlMetricsProvider)
+        public SqlScaleMonitor(string functionId, string taskHubName, SqlMetricsProvider sqlMetricsProvider)
         {
             // Scalers in Durable Functions are shared for all functions in the same task hub.
             // So instead of using a function ID, we use the task hub name as the basis for the descriptor ID.
             string id = $"DurableTask-SqlServer:{taskHubName ?? "default"}";
 
 #if FUNCTIONS_V4
-            this.Descriptor = new ScaleMonitorDescriptor(id: id, functionId: id);
+            this.Descriptor = new ScaleMonitorDescriptor(id: id, functionId: functionId);
 #else
             this.Descriptor = new ScaleMonitorDescriptor(id);
 #endif

src/DurableTask.SqlServer.AzureFunctions/SqlTargetScaler.cs

@@ -12,14 +12,13 @@ public class SqlTargetScaler : ITargetScaler
     {
         readonly SqlMetricsProvider sqlMetricsProvider;
 
-        public SqlTargetScaler(string taskHubName, SqlMetricsProvider sqlMetricsProvider)
+        public SqlTargetScaler(string functionId, SqlMetricsProvider sqlMetricsProvider)
         {
             this.sqlMetricsProvider = sqlMetricsProvider;
 
             // Scalers in Durable Functions are shared for all functions in the same task hub.
             // So instead of using a function ID, we use the task hub name as the basis for the descriptor ID.
-            string id = $"DurableTask-SqlServer:{taskHubName ?? "default"}";
-            this.TargetScalerDescriptor = new TargetScalerDescriptor(id);
+            this.TargetScalerDescriptor = new TargetScalerDescriptor(functionId);
         }
 
         public TargetScalerDescriptor TargetScalerDescriptor { get; }