4.x SE metrics does not correctly add app tag if app-name config is set

[tjquinno]

Environment Details

• Helidon Version: 4.x
• Helidon SE or Helidon MP SE
• JDK version:
• OS:
• Docker version (if applicable):

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Problem Description

Both SE and MP should--and are documented--to allow the user to configure an app name value which causes a tag to be added automatically to every meter. The SE setting is (should be) metrics.app-name and in MP mp.appName (as specified by MicroProfile Metrics).

This works correctly with MP in which the mp_app tag is correctly applied.

But it does not work in SE. Also assigning the app-tag-name (in SE) allows this to work but should not be needed.

Steps to reproduce

In an SE app assign the documented metrics.app-name value. There is no app=some-value tag applied to every meter.