fix comment and only log error if error

Signed-off-by: Marcel Guzik <[email protected]>

crates/extensions/c8y_mapper_ext/src/operations/mod.rs

@@ -130,9 +130,9 @@ impl OperationHandler {
     /// need to be handled as well.
     ///
     /// When an operation terminates (successfully or unsuccessfully), an MQTT operation clearing
-    /// message will be published, but it also needs to be handled when an MQTT broker echoes this
-    /// message back to us, so that `OperationHandler` can free the data associated with the
-    /// operation.
+    /// message will be published to the broker by the running operation task, but this message also
+    /// needs to be handled when an MQTT broker echoes it back to us, so that `OperationHandler` can
+    /// free the data associated with the operation.
     pub async fn handle(&mut self, entity: EntityTarget, message: MqttMessage) {
         let Ok((_, channel)) = self.context.mqtt_schema.entity_channel_of(&message.topic) else {
             return;
@@ -164,14 +164,17 @@ impl OperationHandler {
             } else {
                 let running_operation = RunningOperation::spawn(message, Arc::clone(&self.context));
 
-                self.running_operations.insert(topic, running_operation);
+                self.running_operations
+                    .insert(topic.clone(), running_operation);
                 None
             }
         };
 
         if let Some(terminated_operation) = terminated_operation {
             let join_result = terminated_operation.handle.await;
-            error!("handle: {join_result:?}");
+            if let Err(err) = join_result {
+                error!(%topic, ?err, "operation task could not be joined");
+            }
         }
     }
 }