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Add exemplar compliance lines to the compliance matrix. (#2103)
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* Add exemplar compliance lines to the compliance matrix.

* Fix markdown issue.

* Update spec-compliance-matrix.md

Co-authored-by: Cijo Thomas <[email protected]>

* Fixes from review.

* Update spec-compliance-matrix.md

Co-authored-by: Cijo Thomas <[email protected]>

* Update spec-compliance-matrix.md

Co-authored-by: Joshua MacDonald <[email protected]>

Co-authored-by: Cijo Thomas <[email protected]>
Co-authored-by: Joshua MacDonald <[email protected]>
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@jsuereth @cijothomas @jmacd
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Expand Up @@ -185,6 +185,18 @@ Disclaimer: this list of features is still a work in progress, please refer to t
| The metrics exporter `ForceFlush` can inform the caller whether it succeeded, failed or timed out. | | | | | | | | | | | + | |
| The metrics exporter provides a `shutdown` function. | | + | + | | | | | | | | + | |
| The metrics exporter `shutdown` function do not block indefinitely. | | + | - | | | | | | | | + | |
| The metrics SDK samples `Exemplar`s from measurements. | | | | | | | | | | | | |
| Exemplar sampling can be disabled. | | | | | | | | | | | | |
| The metrics SDK samples measurements in the context of a sampled trace by default. | | | | | | | | | | | | |
| Exemplars retain any attributes available in the measurement that are not preserved by aggregation or view configuration. | | | | | | | | | | | | |
| Exemplars contain the associated trace id and span id of the active span in the Context when the measurement was taken. | | | | | | | | | | | | |
| Exemplars contain the timestamp when the measurement was taken. | | | | | | | | | | | | |
| The metrics SDK provides an `ExemplarReservoir` interface or extension point. | X | | | | | | | | | | | |
| An `ExemplarReservoir` has an `offer` method with access to the measurement value, attributes, `Context` and timestamp. | X | | | | | | | | | | | |
| The metrics SDK provides a `SimpleFixedSizeExemplarReservoir` that is used by default for all aggregations except `ExplicitBucketHistogram`. | | | | | | | | | | | | |
| The metrics SDK provides an `AlignedHistogramBucketExemplarReservoir` that is used by default for `ExplicitBucketHistogram` aggregation. | | | | | | | | | | | | |
| The metrics SDK provides an `ExemplarFilter` interface or extension point. | X | | | | | | | | | | | |
| An `ExemplarFilter` has access to the measurement value, attributes, `Context` and timestamp. | X | | | | | | | | | | | |

## Resource

Expand Down Expand Up @@ -245,6 +257,7 @@ Note: Support for environment variables is optional.
|OTEL_TRACES_SAMPLER_ARG | - | + | | + | + | + | | - | - | | |
|OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT | | | | | | | | | | | |
|OTEL_ATTRIBUTE_COUNT_LIMIT | | | | | | | | | | | |
|OTEL_METRICS_EXEMPLAR_FILTER | | | | | | | | | | | |

## Exporters

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