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Specify a low-memory temporality preference for the OTLP metrics exporter #2961

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reyang merged 8 commits into from
Dec 1, 2022
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Specify a low-memory temporality preference for the OTLP metrics exporter #2961

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Lowmemory temporality preference
Nov 17, 2022
763a34f
add changelog
Nov 18, 2022
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Update specification/metrics/sdk_exporters/otlp.md
jmacd Nov 28, 2022
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Merge branch 'main' into jmacd/lowmem
reyang Dec 1, 2022
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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -13,6 +13,11 @@ release.

### Metrics

- Add OTLP exporter temporality preference named "lowmemory" which
configures Synchronous Counter and Histogram instruments to use
Delta aggregation temporality, which allows them to shed memory
following a cardinality explosion, thus use less memory.

### Logs

- Move `event.domain` from InstrumentationScope attributes to LogRecord
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8 changes: 8 additions & 0 deletions specification/metrics/sdk_exporters/otlp.md
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Expand Up @@ -49,6 +49,14 @@ The recognized (case-insensitive) values for `OTEL_EXPORTER_OTLP_METRICS_TEMPORA
* `cumulative`: Choose cumulative aggregation temporality for all instrument kinds.
* `delta`: Choose Delta aggregation temporality for Counter, Asynchronous Counter and Histogram instrument kinds, choose
Cumulative aggregation for UpDownCounter and Asynchronous UpDownCounter instrument kinds.
* `lowmemory`: This configuration uses Delta aggregation temporality for Synchronous Counter and Histogram and uses Cumulative aggregation temporality for Asynchronous Counter, UpDownCounter and Asynchronous UpDownCounter instrument kinds.
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The "lowmemory" choice is so-named because the SDK can under certain
conditions use less memory in this configuration than the others.
Comparatively, the "cumulative" choice forces the SDK to maintain a
delta-to-cumulative conversion for Synchronous Counter and Histogram
instruments, while the "delta" choice forces the SDK to maintain a
cumulative-to-delta conversion for Asynchronous Counter instruments.

The recognized (case-insensitive) values for `OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION` are:

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