[SDK] Use sdk_start_ts for MetricData start_ts for instruments having cumulative aggregation temporality. #2086
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Additional details and impacted files@@ Coverage Diff @@
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- Coverage 87.19% 87.17% -0.02%
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Files 166 166
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- Hits 4171 4170 -1
- Misses 613 614 +1
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…ative aggregation temporality.
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* commit '7887d32da60f54984a597abccbb0c883f3a51649': (82 commits) [RELEASE] Release version 1.9.0 (open-telemetry#2091) Use sdk_start_ts for MetricData start_ts for instruments having cumulative aggregation temporality. (open-telemetry#2086) [SEMANTIC CONVENTIONS] Upgrade to version 1.20.0 (open-telemetry#2088) [EXPORTER] Add OTLP HTTP SSL support (open-telemetry#1793) Make Windows build environment parallel (open-telemetry#2080) make some hints (open-telemetry#2078) Make some targets parallel in CI pipeline (open-telemetry#2076) [Metrics SDK] Implement Forceflush for Periodic Metric Reader (open-telemetry#2064) Upgraded semantic conventions to 1.19.0 (open-telemetry#2017) Bump actions/stale from 7 to 8 (open-telemetry#2070) Include directory path added for Zipkin exporter example (open-telemetry#2069) Ignore more warning of generated protobuf files than not included in `-Wall` and `-Wextra` (open-telemetry#2067) Add `ForceFlush` for all `LogRecordExporter`s and `SpanExporter`s. (open-telemetry#2000) Remove unused 'alerting' section from prometheus.yml in examples (open-telemetry#2055) Clean warnings in ETW exporters (open-telemetry#2063) Fix default value of `OPENTELEMETRY_INSTALL_default`. (open-telemetry#2062) [EXPORTER] GRPC endpoint scheme should take precedence over OTEL_EXPORTER_OTLP_TRACES_INSECURE (open-telemetry#2060) Fix view names in Prometheus example (open-telemetry#2034) Fix some docs typo (open-telemetry#2057) Checking indices before dereference (open-telemetry#2040) ... # Conflicts: # exporters/ostream/CMakeLists.txt # sdk/src/metrics/state/metric_collector.cc # sdk/src/metrics/state/temporal_metric_storage.cc
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Changes
The OpenTelemetry data model for metrics states that "with cumulative aggregation temporality ... we expect to report the full sum since 'start'", and the accompanying diagram illustrates the same
start_timepresent in each report.However, prior to this change, cumulative metrics were being reported with a start time equal to the last report time. This broke compatibility with services expecting the documented behavior. (For example, without this change, Counter metrics submitted to the Google Cloud Monitoring API via the googlecloudexporter are not represented correctly).
For significant contributions please make sure you have completed the following items:
CHANGELOG.mdupdated for non-trivial changes