Include discovered replicas in replica count for request tracing (#613)

* count total clients from client manager for replica count

* set replica count whenevr calling getclients

Author: amerjusupovic

src/Microsoft.Extensions.Configuration.AzureAppConfiguration/AzureAppConfigurationProvider.cs

@@ -208,6 +208,11 @@ public async Task RefreshAsync(CancellationToken cancellationToken)
 
                     IEnumerable<ConfigurationClient> clients = _configClientManager.GetClients();
 
+                    if (_requestTracingOptions != null)
+                    {
+                        _requestTracingOptions.ReplicaCount = clients.Count() - 1;
+                    }
+
                     //
                     // Filter clients based on their backoff status
                     clients = clients.Where(client =>
@@ -612,6 +617,11 @@ private async Task LoadAsync(bool ignoreFailures, CancellationToken cancellation
                 {
                     IEnumerable<ConfigurationClient> clients = _configClientManager.GetClients();
 
+                    if (_requestTracingOptions != null)
+                    {
+                        _requestTracingOptions.ReplicaCount = clients.Count() - 1;
+                    }
+
                     if (await TryInitializeAsync(clients, startupExceptions, cancellationToken).ConfigureAwait(false))
                     {
                         break;
@@ -966,7 +976,6 @@ private void SetRequestTracingOptions()
                 IsDevEnvironment = TracingUtils.IsDevEnvironment(),
                 IsKeyVaultConfigured = _options.IsKeyVaultConfigured,
                 IsKeyVaultRefreshConfigured = _options.IsKeyVaultRefreshConfigured,
-                ReplicaCount = _options.Endpoints?.Count() - 1 ?? _options.ConnectionStrings?.Count() - 1 ?? 0,
                 FeatureFlagTracing = _options.FeatureFlagTracing,
                 IsLoadBalancingEnabled = _options.LoadBalancingEnabled
             };