restored missing addition

Author: KarlErickson

articles/spring-apps/enterprise/how-to-job-log-streaming.md

@@ -67,6 +67,8 @@ Use the following command to assign an Azure role:
 
 ## List all instances in a job execution
 
+For a job, every time it's triggered, a new job execution is created. Also, depending on the parallelism setting for your job, several replicas or instances execute in parallel.
+
 Use the following command to list all instances in a job execution:
 
 ```azurecli