Log warning in case number of workers reaches maximum

Cargo.lock

@@ -4,7 +4,7 @@ version = 3
 
 [[package]]
 name = "activitypub_federation"
-version = "0.2.2"
+version = "0.2.3"
 dependencies = [
  "activitypub_federation_derive",
  "activitystreams-kinds",

src/core/activity_queue.rs

@@ -84,6 +84,9 @@ where
         stats.dead.this_hour(),
         stats.complete.this_hour()
       );
+            if stats.running as u64 == instance.settings.worker_count {
+                warn!("Maximum number of activitypub workers reached. Consider increasing worker count to avoid federation delays");
+            }
         }
     }