Mark process.runtime.jvm.system.cpu.load_1m and `process.runtime.jv…

…m.system.cpu.utilization` metris as opt-in

CHANGELOG.md

@@ -74,3 +74,5 @@ release.
   attributes for GCP Compute Engine VMs. ([#15](https://github.com/open-telemetry/semantic-conventions/pull/15))
 - Add note that HTTP duration metrics should match HTTP span duration.
   ([#69](https://github.com/open-telemetry/semantic-conventions/pull/69))
+- Mark `process.runtime.jvm.system.cpu.load_1m` and `process.runtime.jvm.system.cpu.utilization` metrics as opt-in.
+  ([#57](https://github.com/open-telemetry/semantic-conventions/pull/57))

specification/metrics/semantic_conventions/runtime-environment-metrics.md

@@ -315,7 +315,7 @@ and [`com.ibm.lang.management.OperatingSystemMXBean#getProcessCpuLoad()`](https:
 
 ### Metric: `process.runtime.jvm.system.cpu.utilization`
 
-This metric is [recommended][MetricRecommended].
+This metric is [Opt-In][MetricOptIn].
 This metric is obtained from [`com.sun.management.OperatingSystemMXBean#getSystemCpuLoad()`](https://docs.oracle.com/en/java/javase/17/docs/api/jdk.management/com/sun/management/OperatingSystemMXBean.html#getSystemCpuLoad()) on Java version 8..13, [`com.sun.management.OperatingSystemMXBean#getCpuLoad()`](https://docs.oracle.com/en/java/javase/17/docs/api/jdk.management/com/sun/management/OperatingSystemMXBean.html#getCpuLoad()) on Java version 14+,
 and [`com.ibm.lang.management.OperatingSystemMXBean#getSystemCpuLoad()`](https://www.ibm.com/docs/api/v1/content/SSYKE2_8.0.0/openj9/api/jdk8/jre/management/extension/com/ibm/lang/management/OperatingSystemMXBean.html) on J9.
 
@@ -330,7 +330,7 @@ and [`com.ibm.lang.management.OperatingSystemMXBean#getSystemCpuLoad()`](https:/
 
 ### Metric: `process.runtime.jvm.system.cpu.load_1m`
 
-This metric is [recommended][MetricRecommended].
+This metric is [Opt-In][MetricOptIn].
 This metric is obtained from [`OperatingSystemMXBean#getSystemLoadAverage()`](https://docs.oracle.com/javase/8/docs/api/java/lang/management/OperatingSystemMXBean.html#getSystemLoadAverage--).
 
 <!-- semconv metric.process.runtime.jvm.system.cpu.load_1m(metric_table) -->
@@ -400,4 +400,5 @@ This metric is obtained from [`BufferPoolMXBean#getCount()`](https://docs.oracle
 <!-- endsemconv -->
 
 [DocumentStatus]: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.21.0/specification/document-status.md
+[MetricOptIn]: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.21.0/specification/metrics/metric-requirement-level.md#opt-in
 [MetricRecommended]: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.21.0/specification/metrics/metric-requirement-level.md#recommended