imperatives opened a new issue #5079:
URL: https://github.com/apache/skywalking/issues/5079


   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [X ] Question or discussion
   - [ ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - What do you want to know?
   What is the proper ${SW} syntax to set the Skywalking Agent instance name in 
the `agent.config` file?
   ___
   ### Bug
   - Which version of SkyWalking, OS and JRE?
   8.0.1
   - Which company or project?
   
   - What happen?
   If possible, provide a way for reproducing the error. e.g. demo application, 
component version.
   I am unable to set the instance name (`agent.instance_name`) from the 
`agent.config` file.  No matter what configuration values I set the Instance 
Name is set to `UUID@hostname`. 
   
   I have attempted the following without success:
   ```
   agent.instance_name=${SW_AGENT_INSTANCE_NAME:<value>}
   agent.instance_name=${SW_AGENT_INSTANCE:<value>}
   agent.instance_name=${SW_INSTANCE_NAME:<value>}
   agent.instance_name=${SW_INSTANCE:<value>}
   ```
   
   Am I entering the incorrect SW name or does the order of when 
agent.instance_name is listed?
   
   Setting agent.instance_name value at the Agent Options level appears to work 
as expected (e.g. 
   `-javaagent:/path/to/skywalking-agent.jar=agent.instance_name=<value>`).
   ___
   ### Requirement or improvement
   - Please describe about your requirements or improvement suggestions.
   I would prefer to be able to set the `agent.instance_name` value in the 
`agent.config` file. 


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