Drop processor.transform.ConvertBetweenSumAndGaugeMetricContext feature gate

[jmcarp]

Component(s)

processor/transform

Describe the issue you're reporting

There's an alpha feature gate called processor.transform.ConvertBetweenSumAndGaugeMetricContext. But the feature seems straightforward and works well, as far as I can tell. Has it been available long enough to drop the feature gate?

[github-actions[bot]]

Pinging code owners:

• processor/transform: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley

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[TylerHelmuth]

Thanks for reminding me about this gate. We should continue forward through the standard feature gate process: https://github.com/open-telemetry/opentelemetry-collector/tree/main/featuregate#feature-lifecycle

[ernest-liftoff]

hello, using 0.108 collectors, i can no longer use the convert_gauge_to_sum function.

is this expected?

Error: invalid configuration: processors::transform/correct_temporality: unable to parse OTTL statement "convert_gauge_to_sum(\"cumulative\", true)": undefined function "convert_gauge_to_sum"
2024/09/05 05:40:52 collector server run finished with error: invalid configuration: processors::transform/correct_temporality: unable to parse OTTL statement "convert_gauge_to_sum(\"cumulative\", true)": undefined function "convert_gauge_to_sum"

[wildum]

That's because the feature gate "processor.transform.ConvertBetweenSumAndGaugeMetricContext" was switched from Alpha to Beta. In Alpha stage, the gate is disabled by default but in Beta stage it is enabled by default. If you want the same behavior as before, you need to disable it explicitly: --feature-gates -processor.transform.ConvertBetweenSumAndGaugeMetricContext

[wildum]

else you need to change the context. It's not on the "datapoint" context anymore but on the "metric" context that these functions should be used. I think that the readme update was forgotten: https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/processor/transformprocessor I will create a PR