Provide mechanism to disable all or selected metrics

[markxnelson]

Environment Details

• Helidon Version: 1.2.1
• Helidon MP
• JDK version: 11
• OS: linux
• Docker version (if applicable): 19

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Problem Description

I can disable individual metrics like this:
metrics.base.classloader.currentLoadedClass.count.enabled=false

But I cannot disable all metrics, I would like to be able to do something like one of these…
metrics.base.*.enabled=false
metrics.base.all.enabled=false
metrics.base.enabled=false

[markxnelson]

@tomas-langer @pfmackin FYI

[tomas-langer]

See #990 - solution for Health for overall disabling of the feature

[tjquinno]

See PR #1052

Note that the proposed changes allow you to control base metrics using the third of your suggestions: metrics.base.enabled=false.

This:

• is consistent with other (e.g., health) component-wide config settings,
• does not collide with any current or potentially future base metric, and
• does not introduce new semantics (helpful though they might be) for wildcarding.