[processor/deltatocumulative]: bugfix - permit advancing start-time #31365
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sh0rez
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Imagine this situation:
And T1 < T2 < T3 < T4. The interval from T2 to T3 is unaccounted for and even if a corresponding data point arrives later it would be ignored. Or maybe it gets lost for some reason. What do you think about a metric that tracks this unaccounted time? Since there are no more resets, it would replace the |
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@ethercrow I like that, but I think it's out of scope for this PR (given the metrics one isn't even merged). But lets add it later 👍 |
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@RichieSams @djaglowski please take a look! |
djaglowski
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Feb 28, 2024
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Ah, they beat me to it. Good find :) |
XinRanZhAWS
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Mar 13, 2024
…pen-telemetry#31365) **Description:** <Describe what has changed.> The [spec](https://opentelemetry.io/docs/specs/otel/metrics/data-model/#sums-delta-to-cumulative) allows the `StartTimestamp` of a delta stream to advance over time, without affecting the aggregation. Previously, the running counter was reset with each start-time change. This was violating the spec and also effectively prevented meaningful aggregation as series were reset all the time. **Testing:** A test-case was modified to explicitly check this behavior is permitted and handled correctly.
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Description:
The spec allows the
StartTimestampof a delta stream to advance over time, without affecting the aggregation.Previously, the running counter was reset with each start-time change. This was violating the spec and also effectively prevented meaningful aggregation as series were reset all the time.
Testing:
A test-case was modified to explicitly check this behavior is permitted and handled correctly.