[jmx-scraper] Create weaver model for jmx-scraper metrics open-telemetry#2072

 - fixed the updated desc in JvmIntegrationTest

Author: mcmho

jmx-scraper/src/integrationTest/java/io/opentelemetry/contrib/jmxscraper/target_systems/JvmIntegrationTest.java

@@ -122,23 +122,23 @@ protected MetricsVerifier createMetricsVerifier() {
             "jvm.memory.nonheap.committed",
             metric ->
                 metric
-                    .hasDescription("current non-heap usage")
+                    .hasDescription("current non-heap size")
                     .hasUnit("By")
                     .isGauge()
                     .hasDataPointsWithoutAttributes())
         .add(
             "jvm.memory.nonheap.init",
             metric ->
                 metric
-                    .hasDescription("current non-heap usage")
+                    .hasDescription("initial non-heap size")
                     .hasUnit("By")
                     .isGauge()
                     .hasDataPointsWithoutAttributes())
         .add(
             "jvm.memory.nonheap.max",
             metric ->
                 metric
-                    .hasDescription("current non-heap usage")
+                    .hasDescription("max non-heap size")
                     .hasUnit("By")
                     .isGauge()
                     .hasDataPointsWithoutAttributes())
@@ -154,23 +154,23 @@ protected MetricsVerifier createMetricsVerifier() {
             "jvm.memory.pool.committed",
             metric ->
                 metric
-                    .hasDescription("current memory pool usage")
+                    .hasDescription("current memory pool size")
                     .hasUnit("By")
                     .isGauge()
                     .hasDataPointsWithAttributes(memoryAttributes))
         .add(
             "jvm.memory.pool.init",
             metric ->
                 metric
-                    .hasDescription("current memory pool usage")
+                    .hasDescription("initial memory pool size")
                     .hasUnit("By")
                     .isGauge()
                     .hasDataPointsWithAttributes(memoryAttributes))
         .add(
             "jvm.memory.pool.max",
             metric ->
                 metric
-                    .hasDescription("current memory pool usage")
+                    .hasDescription("max memory pool size")
                     .hasUnit("By")
                     .isGauge()
                     .hasDataPointsWithAttributes(memoryAttributes))