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Add a way to export gauge metrics and other changes. #604

Merged
merged 2 commits into from
Jun 3, 2021
Merged

Add a way to export gauge metrics and other changes. #604

merged 2 commits into from
Jun 3, 2021

Commits on Jun 3, 2021

  1. Add a way to export gauge metrics and other changes. 

    = Introduce the ability to transform metrics before exporting. Currently implementing two types of transformations:
  - Add "failure" metric to EventMetrics.
  - Convert cumulative metrics to gauge metrics.

= To calculate gauge metrics from cumulative metrics, we keep a "last-value" cache of EventMetrics by a key that consists of metric names and label keys and values. We subtract last EventMetrics from the new EventMetrics and export the results.

= This requires implementing subtract logic through the metrics stack: from EventMetrics to individual value types. We need to also take into account that metrics may be reset.

Ref: #494
PiperOrigin-RevId: 377179096
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    manugarg committed Jun 3, 2021
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  2. Update protobufs' Go code.

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    manugarg committed Jun 3, 2021
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