Add Galaxy repository API and clients

src/MxGateway.Server/Grpc/MxAccessGatewayService.cs

@@ -1,6 +1,8 @@
+using System.Diagnostics;
 using Grpc.Core;
 using MxGateway.Contracts;
 using MxGateway.Contracts.Proto;
+using MxGateway.Server.Metrics;
 using MxGateway.Server.Security.Authorization;
 using MxGateway.Server.Sessions;
 using MxGateway.Server.Workers;
@@ -13,6 +15,7 @@ public sealed class MxAccessGatewayService(
     MxAccessGrpcRequestValidator requestValidator,
     MxAccessGrpcMapper mapper,
     IEventStreamService eventStreamService,
+    GatewayMetrics metrics,
     ILogger<MxAccessGatewayService> logger) : MxAccessGateway.MxAccessGatewayBase
 {
     public override async Task<OpenSessionReply> OpenSession(
@@ -110,7 +113,9 @@ public sealed class MxAccessGatewayService(
                 .WithCancellation(context.CancellationToken)
                 .ConfigureAwait(false))
             {
+                Stopwatch stopwatch = Stopwatch.StartNew();
                 await responseStream.WriteAsync(publicEvent).ConfigureAwait(false);
+                metrics.RecordEventStreamSend(publicEvent.Family.ToString(), stopwatch.Elapsed);
             }
         }
         catch (Exception exception) when (exception is not RpcException)