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Allow JVM metrics to be synchronous
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‎CHANGELOG.md‎

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([#2290](https://github.com/open-telemetry/opentelemetry-specification/pull/2290))
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- Add semantic conventions for [CloudEvents](https://cloudevents.io).
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([#1978](https://github.com/open-telemetry/opentelemetry-specification/pull/1978))
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- Allow JVM metrics to be synchronous
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([#2451](https://github.com/open-telemetry/opentelemetry-specification/pull/1978))
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### Compatibility
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‎specification/metrics/semantic_conventions/runtime-environment-metrics.md‎

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All JVM metric attributes are required unless otherwise indicated.
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| Name | Description | Unit | Unit ([UCUM](README.md#instrument-units)) | Instrument Type | Value Type | Attribute Key | Attribute Values |
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|--------------------------------------|-------------------------------------|-------|-------------------------------------------|----------------------------|------------|---------------|-----------------------|
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| process.runtime.jvm.memory.usage | Measure of memory used | Bytes | `By` | Asynchronous UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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| process.runtime.jvm.memory.init | Measure of initial memory requested | Bytes | `By` | Asynchronous UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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| process.runtime.jvm.memory.committed | Measure of memory committed | Bytes | `By` | Asynchronous UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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| process.runtime.jvm.memory.max | Measure of max obtainable memory | Bytes | `By` | Asynchronous UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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| Name | Description | Unit | Unit ([UCUM](README.md#instrument-units)) | Instrument Type | Value Type | Attribute Key | Attribute Values |
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|--------------------------------------|-------------------------------------|-------|-------------------------------------------|-----------------|------------|---------------|-----------------------|
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| process.runtime.jvm.memory.usage | Measure of memory used | Bytes | `By` | UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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| process.runtime.jvm.memory.init | Measure of initial memory requested | Bytes | `By` | UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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| process.runtime.jvm.memory.committed | Measure of memory committed | Bytes | `By` | UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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| process.runtime.jvm.memory.max | Measure of max obtainable memory | Bytes | `By` | UpDownCounter | Int64 | type | `"heap"`, `"nonheap"` |
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| | | | | | | pool | Name of pool [1] |
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**[1]**: Pool names are generally obtained
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via [MemoryPoolMXBean#getName()](https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryPoolMXBean.html#getName())

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