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|[Counter](#counter)| sync | Record monotonic (positive) values. | Record user logins |[sum (monotonic=true)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[Async Counter](#async-counter)| async | Observe monotonic sums. | Observe number of classes loaded in the JVM |[sum (monotonic=true)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[UpDownCounter](#updowncounter)| sync | Record non-monotonic (positive and negative) values. | Record when items are added to and removed from a queue |[sum (monotonic=false)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[Async UpDownCounter](#async-updowncounter)| async | Observe non-monotonic (positive and negative) sums. | Observe JVM memory pool usage |[sum (monotonic=false)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[Histogram](#histogram)| sync | Record monotonic (positive) values where the distribution is important. | Record duration of HTTP requests processed by server |[ExplicitBucketHistgram](/docs/specs/otel/metrics/sdk/#explicit-bucket-histogram-aggregation)|
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|[Gauge](#gauge)| sync | Record the latest value where spatial re-aggregation does not make sense **[1]**. | Record temperature |[LastValue](/docs/specs/otel/metrics/sdk/#last-value-aggregation)|
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|[Async Gauge](#async-gauge)| async | Observe the latest value where spatial re-aggregation does not make sense **[1]**. | Observe CPU utilization |[LastValue](/docs/specs/otel/metrics/sdk/#last-value-aggregation)|
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| Instrument | Sync or Async | Description | Example | Default SDK Aggregation |
|[Counter](#counter)| sync | Record monotonic (positive) values. | Record user logins |[sum (monotonic=true)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[Async Counter](#async-counter)| async | Observe monotonic sums. | Observe number of classes loaded in the JVM |[sum (monotonic=true)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[UpDownCounter](#updowncounter)| sync | Record non-monotonic (positive and negative) values. | Record when items are added to and removed from a queue |[sum (monotonic=false)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[Async UpDownCounter](#async-updowncounter)| async | Observe non-monotonic (positive and negative) sums. | Observe JVM memory pool usage |[sum (monotonic=false)](/docs/specs/otel/metrics/sdk/#sum-aggregation)|
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|[Histogram](#histogram)| sync | Record monotonic (positive) values where the distribution is important. | Record duration of HTTP requests processed by server |[ExplicitBucketHistogram](/docs/specs/otel/metrics/sdk/#explicit-bucket-histogram-aggregation)|
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|[Gauge](#gauge)| sync | Record the latest value where spatial re-aggregation does not make sense **[1]**. | Record temperature |[LastValue](/docs/specs/otel/metrics/sdk/#last-value-aggregation)|
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|[Async Gauge](#async-gauge)| async | Observe the latest value where spatial re-aggregation does not make sense **[1]**. | Observe CPU utilization |[LastValue](/docs/specs/otel/metrics/sdk/#last-value-aggregation)|
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**[1]**: Spatial re-aggregation is the process of merging attribute streams by
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dropping attributes which are not needed. For example, given series with
@@ -1424,7 +1425,7 @@ The `OpenTelemetry#noop()` method provides access to a noop implementation of
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the name suggests, the noop implementation does nothing and is designed to have
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no impact on performance. Instrumentation may see impact on performance even
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when the noop is used if it is computing / allocating attribute values and other
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data requried to record the telemetry. The noop is a useful default instance of
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data required to record the telemetry. The noop is a useful default instance of
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`OpenTelemetry` when a user has not configured and installed a concrete
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implementation such as the [SDK](/docs/languages/java/sdk/).
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