Remove MP Metrics 1.0-to-2.0 bridge component and related classes in other components (helidon-io#1879)

Author: tjquinno

CHANGELOG.md

@@ -19,6 +19,28 @@ This is the fourth milestone release of Helidon 2.0.
 
 ### Backward incompatible changes
 
+#### Internal `helidon-common-metrics` and Related Classes Removed
+Later releases of Helidon 1.x included the `helidon-common-metrics` component and related
+classes which provided a common interface to ease the transition from MicroProfile 
+Metrics 1.x to 2.x. 
+Although intended for use only by Helidon subsystems rather than 
+by developers and users, the component and its contents had to be public so multiple Helidon 
+subsystems could use them. 
+Therefore, user code might have used these elements.
+
+This release removes this common interface and associated classes. 
+Any user code that used these internal classes can use the corresponding supported classes in 
+`io.helidon.metrics:helidon-metrics` and MicroProfile Metrics 2.0 instead. 
+
+|Helidon Artifact |Interfaces/Classes |
+|--------------|----------------|
+|`io.helidon.common:helidon-common-metrics` |Entire artifact, including all `io.helidon.common.metrics...` classes |
+|`io.helidon.metrics:helidon-metrics` |`HelidonMetadata` |
+| |`InternalBridgeImpl` |
+| |`InternalMetadataBuilderImpl` |
+| |`InternalMetadataImpl` |
+| |`InternalMetricIDImpl` |
+
 ## [2.0.0-M3]
 
 ### Notes

bom/pom.xml

@@ -555,11 +555,6 @@
                 <artifactId>helidon-common-context</artifactId>
                 <version>${helidon.version}</version>
             </dependency>
-            <dependency>
-                <groupId>io.helidon.common</groupId>
-                <artifactId>helidon-common-metrics</artifactId>
-                <version>${helidon.version}</version>
-            </dependency>
 
             <!-- db client -->
             <dependency>