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Add Gauge. Change Metric type to be a more detailed structure with details about the aggregation and temporality. #182

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merged 9 commits into from
Jul 30, 2020

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@bogdandrutu bogdandrutu commented Jul 29, 2020

This PR takes a more descriptive approach where the Aggregation (the last applied aggregation if any) is clearly defined and Temporality is available only where it makes sense. This can help clearly identify what are the possible values and properties for different types of Aggregations.

There are some things that can be considered (TODOs left in the code):

IMPORTANT:

@bogdandrutu bogdandrutu requested review from a team July 29, 2020 04:44
@bogdandrutu bogdandrutu changed the title Change Metric type to be a more detailed structure with details about the aggregation and temporality. [Current] Change Metric type to be a more detailed structure with details about the aggregation and temporality. Jul 29, 2020
… the aggregation and temporality.

This PR takes a more descriptive approach where the Aggregation (the last applied aggregation if any) is clearly defined and Temporality is available only where it makes sense. This can help clearly identify what are the possible values and properties for different types of Aggregations.

There are some things that can be considered (TODOs left in the code):

* open-telemetry/opentelemetry-specification#725
* Histogram/Summary sum - monotonicity?
* Previous aggregation measurements: raw measurements or "derived" measurements (results of another aggregation).
* Support for RawMeasurements (recorded via the Sync Instruments)
* Decide if support for INSTANTANEOUS temporality is still needed.

IMPORTANT:
* This PR is not equivalent with open-telemetry#168 or open-telemetry#181, this is inspired by these PRs but makes some changes that are not compatible with that PR.
* This PR is an incremental update, without any significant semantic changes (except adding the notion of GAUGE), from the current state, more changes will be added in the future to resolve the TODOs.

Signed-off-by: Bogdan Drutu <[email protected]>
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bogdandrutu commented Jul 29, 2020

@james-bebbington

  • Temp = Instantaneous only seems to be relevant for "Last" (i.e. Summary?) or Raw values, whereas Temp = Delta/Cumulative seems to be only relevant for Gauge/Histogram. Should these concepts be separated?
  • I'm not across the exemplar stuff, but I would prefer to keep individual measurements (raw measurements?) as a separate category similar to your not-current PR. I think sharing the same data structure for exemplars and Instantaneous aggregations is confusing and unnecessary.

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  • Temp - there is a todo to be discussed in a followup PR, trying to limit changes in this
  • Exemplar - Not yet finalized, more discussion to happen at that moment

@bogdandrutu bogdandrutu changed the title [Current] Change Metric type to be a more detailed structure with details about the aggregation and temporality. Add Gauge. Change Metric type to be a more detailed structure with details about the aggregation and temporality. Jul 29, 2020
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@open-telemetry/specs-metrics-approvers please review this 👍

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(please remember to tag with "Metrics" label)

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@aabmass aabmass left a comment

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LGTM

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@MrAlias MrAlias left a comment

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LGTM, only asks are around comments. Nothing blocking.

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This PR has 6 approves, and 3 owners approves, + myself so I think it is good to be merged.

@bogdandrutu bogdandrutu merged commit 7ae34aa into open-telemetry:master Jul 30, 2020
@bogdandrutu bogdandrutu deleted the currenttype branch July 30, 2020 22:17
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7 participants