feat: add preprod observability foundation

backend/src/Socialize.Api/Modules/ContentItems/Handlers/CreateContentItem.cs

@@ -1,6 +1,7 @@
 using FastEndpoints;
 using Microsoft.EntityFrameworkCore;
 using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Observability;
 using Socialize.Api.Infrastructure.Security;
 using Socialize.Api.Modules.ContentItems.Contracts;
 using Socialize.Api.Modules.Notifications.Contracts;
@@ -39,7 +40,8 @@ internal class CreateContentItemHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService,
     IContentItemActivityWriter activityWriter,
-    INotificationEventWriter notificationEventWriter)
+    INotificationEventWriter notificationEventWriter,
+    SocializeMetrics metrics)
     : Endpoint<CreateContentItemRequest, ContentItemDto>
 {
     public override void Configure()
@@ -123,6 +125,7 @@ internal class CreateContentItemHandler(
             CreatedAt = DateTimeOffset.UtcNow,
         });
         await dbContext.SaveChangesAsync(ct);
+        metrics.RecordContentItemCreated(item.WorkspaceId);
 
         await activityWriter.WriteAsync(
             new ContentItemActivityWriteModel(