Pending notification is deleted while it is never sent

[besteg]

We found next exception:

{ [-]
Exception: Microsoft.WindowsAzure.Storage.StorageException: The remote server returned an error: (500) Internal Server Error. ---> System.Net.WebException: The remote server returned an error: (500) Internal Server Error.
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync[T](RESTCommand1 cmd, IRetryPolicy policy, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:line 677 --- End of inner exception stack trace --- at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync[T](RESTCommand1 cmd, IRetryPolicy policy, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:line 604
at Microsoft.WindowsAzure.Storage.Queue.CloudQueue.CreateIfNotExists(QueueRequestOptions options, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Queue\CloudQueue.cs:line 162
at Journalist.WindowsAzure.Storage.StorageFactory.<>c__DisplayClass6_0.b__0()
at System.Lazy1.CreateValue() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Lazy1.get_Value()
at Journalist.WindowsAzure.Storage.Queues.CloudQueueAdapter.AddMessageAsync(Byte[] content)
at Journalist.EventStore.Notifications.Channels.NotificationsChannel.d__17.MoveNext()
Request Information
RequestID:2cd0c103-9003-003b-6c87-9b36ee000000
RequestDate:Mon, 24 Dec 2018 12:52:16 GMT
StatusMessage:Operation could not be completed within the specified time.

 Level:	 Error	
 MachineName:	 RD0003FF2CD2C1	
 MessageTemplate:	 Notification sending failed. Notification: {@Notification}.	
 Notification:	{	[-]	
	 DeliveryCount:	 0	
	 FromVersion:	{	[-]	
  	 _typeTag:	 StreamVersion	
	}	
	 IsAddressed:	 false	
	 NotificationId:	{	[-]	
  	 _typeTag:	 NotificationId	
	}	
	 NotificationType:	 Journalist.EventStore.Notifications.Types.EventStreamUpdated	
	 StreamName:	 somestream-41abfe87-0915-4b13-beac-28b72a5892c8	
	 ToVersion:	{	[-]	
  	 _typeTag:	 StreamVersion	
	}	
	 _typeTag:	 EventStreamUpdated	
}	
 SourceContext:	 Journalist.EventStore.Notifications.Channels.NotificationsChannel	
 Timestamp:	 2018-12-27T15:40:23.2052697+03:00	

}

NotificationsChannel swallowed the exception and the notification was deleted in PendingNotificationsChaser.ProcessStreamNotificationAsync and was never sent.