fix other units

Author: SylvainJuge

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

@@ -53,15 +53,15 @@ protected MetricsVerifier createMetricsVerifier() {
             metric ->
                 metric
                     .hasDescription("number of loaded classes")
-                    .hasUnit("1")
+                    .hasUnit("{class}")
                     .isGauge()
                     .hasDataPointsWithoutAttributes())
         .add(
             "jvm.gc.collections.count",
             metric ->
                 metric
                     .hasDescription("total number of collections that have occurred")
-                    .hasUnit("1")
+                    .hasUnit("{collection}")
                     .isCounter()
                     .hasDataPointsWithAttributes(gcAlgorithmAttributes))
         .add(
@@ -174,7 +174,7 @@ protected MetricsVerifier createMetricsVerifier() {
             metric ->
                 metric
                     .hasDescription("number of threads")
-                    .hasUnit("1")
+                    .hasUnit("{thread}")
                     .isGauge()
                     .hasDataPointsWithoutAttributes());
   }

jmx-scraper/src/main/resources/jvm.yaml

@@ -7,15 +7,15 @@ rules:
       LoadedClassCount:
         metric: jvm.classes.loaded
         type: gauge
-        unit: '1'
+        unit: '{class}'
         desc: number of loaded classes
 
   - bean: java.lang:type=GarbageCollector,name=*
     mapping:
       CollectionCount:
         metric: jvm.gc.collections.count
         type: counter
-        unit: '1'
+        unit: '{collection}'
         desc: total number of collections that have occurred
         metricAttribute:
           name: param(name)
@@ -87,5 +87,5 @@ rules:
     mapping:
       ThreadCount:
         metric: jvm.threads.count
-        unit: '1'
+        unit: '{thread}'
         desc: number of threads