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otlptranslator: fix silently swallowed error in addSumNumberDataPoints#17954

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aknuds1 merged 1 commit intoprometheus:mainfrom
aknuds1:fix/otlptranslator-error-handling
Jan 28, 2026
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otlptranslator: fix silently swallowed error in addSumNumberDataPoints#17954
aknuds1 merged 1 commit intoprometheus:mainfrom
aknuds1:fix/otlptranslator-error-handling

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@aknuds1 aknuds1 commented Jan 28, 2026

Which issue(s) does the PR fix:

Fixes #17953

Does this PR introduce a user-facing change?

[BUGFIX] OTLP: Fix potential silent data loss for sum metrics

Description

The createAttributes error in addSumNumberDataPoints was incorrectly returning nil instead of err, causing errors to be silently discarded. This was introduced in #16951 during a refactor.

This fix aligns the error handling with addGaugeNumberDataPoints in the same file, which correctly returns the error.

The createAttributes error was incorrectly returning nil instead of err,
causing errors to be silently discarded. This could lead to silent data
loss for sum metrics during OTLP ingestion.

Fixes prometheus#17953

Signed-off-by: Arve Knudsen <[email protected]>
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LGTM, I would only suggest some tweaks to the release notes to be more user-friendly. The current one feels too developer-focused.

What do you think about:

[BUGFIX] OTLP: Fix potential silent data loss for sum metrics.

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aknuds1 commented Jan 28, 2026

@ArthurSens Done, thanks.

@aknuds1 aknuds1 merged commit dc34b90 into prometheus:main Jan 28, 2026
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renovate bot added a commit to sdwilsh/ansible-playbooks that referenced this pull request Mar 12, 2026
##### [\`v3.10.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.10.0)

Prometheus now offers a distroless Docker image variant alongside the default
busybox image. The distroless variant provides enhanced security with a minimal
base image, uses UID/GID 65532 (nonroot) instead of nobody, and removes the
VOLUME declaration. Both variants are available with `-busybox` and `-distroless`
tag suffixes (e.g., `prom/prometheus:latest-busybox`, `prom/prometheus:latest-distroless`).
The busybox image remains the default with no suffix for backwards compatibility
(e.g., `prom/prometheus:latest` points to the busybox variant).

For users migrating existing **named** volumes from the busybox image to the distroless variant, the ownership can be adjusted with:

```
docker run --rm -v prometheus-data:/prometheus alpine chown -R 65532:65532 /prometheus
```

Then, the container can be started with the old volume with:

```
docker run -v prometheus-data:/prometheus prom/prometheus:latest-distroless
```

User migrating from bind mounts might need to ajust permissions too, depending on their setup.

- \[CHANGE] Alerting: Add `alertmanager` dimension to following metrics: `prometheus_notifications_dropped_total`, `prometheus_notifications_queue_capacity`, `prometheus_notifications_queue_length`. [#16355](prometheus/prometheus#16355)
- \[CHANGE] UI: Hide expanded alert annotations by default, enabling more information density on the `/alerts` page. [#17611](prometheus/prometheus#17611)
- \[FEATURE] AWS SD: Add MSK Role. [#17600](prometheus/prometheus#17600)
- \[FEATURE] PromQL: Add `fill()` / `fill_left()` / `fill_right()` binop modifiers for specifying default values for missing series. [#17644](prometheus/prometheus#17644)
- \[FEATURE] Web: Add OpenAPI 3.2 specification for the HTTP API at `/api/v1/openapi.yaml`. [#17825](prometheus/prometheus#17825)
- \[FEATURE] Dockerfile: Add distroless image variant using UID/GID 65532 and no VOLUME declaration. Busybox image remains default. [#17876](prometheus/prometheus#17876)
- \[FEATURE] Web: Add on-demand wall time profiling under `<URL>/debug/pprof/fgprof`. [#18027](prometheus/prometheus#18027)
- \[ENHANCEMENT] PromQL: Add more detail to histogram quantile monotonicity info annotations. [#15578](prometheus/prometheus#15578)
- \[ENHANCEMENT] Alerting: Independent alertmanager sendloops. [#16355](prometheus/prometheus#16355)
- \[ENHANCEMENT] TSDB: Experimental support for early compaction of stale series in the memory with configurable threshold `stale_series_compaction_threshold` in the config file. [#16929](prometheus/prometheus#16929)
- \[ENHANCEMENT] Service Discovery: Service discoveries are now removable from the Prometheus binary through the Go build tag `remove_all_sd` and individual service discoveries can be re-added with the build tags `enable_<sd name>_sd`. Users can build a custom Prometheus with only the necessary SDs for a smaller binary size. [#17736](prometheus/prometheus#17736)
- \[ENHANCEMENT] Promtool: Support promql syntax features `promql-duration-expr` and `promql-extended-range-selectors`. [#17926](prometheus/prometheus#17926)
- \[PERF] PromQL: Avoid unnecessary label extraction in PromQL functions. [#17676](prometheus/prometheus#17676)
- \[PERF] PromQL: Improve performance of regex matchers like `.*-.*-.*`. [#17707](prometheus/prometheus#17707)
- \[PERF] OTLP: Add label caching for OTLP-to-Prometheus conversion to reduce allocations and improve latency. [#17860](prometheus/prometheus#17860)
- \[PERF] API: Compute `/api/v1/targets/relabel_steps` in a single pass instead of re-running relabeling for each prefix. [#17969](prometheus/prometheus#17969)
- \[PERF] tsdb: Optimize LabelValues intersection performance for matchers. [#18069](prometheus/prometheus#18069)
- \[BUGFIX] PromQL: Prevent query strings containing only UTF-8 continuation bytes from crashing Prometheus. [#17735](prometheus/prometheus#17735)
- \[BUGFIX] Web: Fix missing `X-Prometheus-Stopping` header for `/-/ready` endpoint in `NotReady` state. [#17795](prometheus/prometheus#17795)
- \[BUGFIX] PromQL: Fix PromQL `info()` function returning empty results when filtering by a label that exists on both the input metric and `target_info`. [#17817](prometheus/prometheus#17817)
- \[BUGFIX] TSDB: Fix a bug during exemplar buffer grow/shrink that could cause exemplars to be incorrectly discarded. [#17863](prometheus/prometheus#17863)
- \[BUGFIX] UI: Fix broken graph display after page reload, due to broken Y axis min encoding/decoding. [#17869](prometheus/prometheus#17869)
- \[BUGFIX] TSDB: Fix memory leaks in buffer pools by clearing reference fields (Labels, Histogram pointers, metadata strings) before returning buffers to pools. [#17879](prometheus/prometheus#17879)
- \[BUGFIX] PromQL: info function: fix series without identifying labels not being returned. [#17898](prometheus/prometheus#17898)
- \[BUGFIX] OTLP: Filter `__name__` from OTLP attributes to prevent duplicate labels. [#17917](prometheus/prometheus#17917)
- \[BUGFIX] TSDB: Fix division by zero when computing stale series ratio with empty head. [#17952](prometheus/prometheus#17952)
- \[BUGFIX] OTLP: Fix potential silent data loss for sum metrics. [#17954](prometheus/prometheus#17954)
- \[BUGFIX] PromQL: Fix smoothed interpolation across counter resets. [#17988](prometheus/prometheus#17988)
- \[BUGFIX] PromQL: Fix panic with `@` modifier on empty ranges. [#18020](prometheus/prometheus#18020)
- \[BUGFIX] PromQL: Fix `avg_over_time` for a single native histogram. [#18058](prometheus/prometheus#18058)
renovate bot added a commit to sdwilsh/ansible-playbooks that referenced this pull request Mar 13, 2026
##### [\`v3.10.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.10.0)

Prometheus now offers a distroless Docker image variant alongside the default
busybox image. The distroless variant provides enhanced security with a minimal
base image, uses UID/GID 65532 (nonroot) instead of nobody, and removes the
VOLUME declaration. Both variants are available with `-busybox` and `-distroless`
tag suffixes (e.g., `prom/prometheus:latest-busybox`, `prom/prometheus:latest-distroless`).
The busybox image remains the default with no suffix for backwards compatibility
(e.g., `prom/prometheus:latest` points to the busybox variant).

For users migrating existing **named** volumes from the busybox image to the distroless variant, the ownership can be adjusted with:

```
docker run --rm -v prometheus-data:/prometheus alpine chown -R 65532:65532 /prometheus
```

Then, the container can be started with the old volume with:

```
docker run -v prometheus-data:/prometheus prom/prometheus:latest-distroless
```

User migrating from bind mounts might need to ajust permissions too, depending on their setup.

- \[CHANGE] Alerting: Add `alertmanager` dimension to following metrics: `prometheus_notifications_dropped_total`, `prometheus_notifications_queue_capacity`, `prometheus_notifications_queue_length`. [#16355](prometheus/prometheus#16355)
- \[CHANGE] UI: Hide expanded alert annotations by default, enabling more information density on the `/alerts` page. [#17611](prometheus/prometheus#17611)
- \[FEATURE] AWS SD: Add MSK Role. [#17600](prometheus/prometheus#17600)
- \[FEATURE] PromQL: Add `fill()` / `fill_left()` / `fill_right()` binop modifiers for specifying default values for missing series. [#17644](prometheus/prometheus#17644)
- \[FEATURE] Web: Add OpenAPI 3.2 specification for the HTTP API at `/api/v1/openapi.yaml`. [#17825](prometheus/prometheus#17825)
- \[FEATURE] Dockerfile: Add distroless image variant using UID/GID 65532 and no VOLUME declaration. Busybox image remains default. [#17876](prometheus/prometheus#17876)
- \[FEATURE] Web: Add on-demand wall time profiling under `<URL>/debug/pprof/fgprof`. [#18027](prometheus/prometheus#18027)
- \[ENHANCEMENT] PromQL: Add more detail to histogram quantile monotonicity info annotations. [#15578](prometheus/prometheus#15578)
- \[ENHANCEMENT] Alerting: Independent alertmanager sendloops. [#16355](prometheus/prometheus#16355)
- \[ENHANCEMENT] TSDB: Experimental support for early compaction of stale series in the memory with configurable threshold `stale_series_compaction_threshold` in the config file. [#16929](prometheus/prometheus#16929)
- \[ENHANCEMENT] Service Discovery: Service discoveries are now removable from the Prometheus binary through the Go build tag `remove_all_sd` and individual service discoveries can be re-added with the build tags `enable_<sd name>_sd`. Users can build a custom Prometheus with only the necessary SDs for a smaller binary size. [#17736](prometheus/prometheus#17736)
- \[ENHANCEMENT] Promtool: Support promql syntax features `promql-duration-expr` and `promql-extended-range-selectors`. [#17926](prometheus/prometheus#17926)
- \[PERF] PromQL: Avoid unnecessary label extraction in PromQL functions. [#17676](prometheus/prometheus#17676)
- \[PERF] PromQL: Improve performance of regex matchers like `.*-.*-.*`. [#17707](prometheus/prometheus#17707)
- \[PERF] OTLP: Add label caching for OTLP-to-Prometheus conversion to reduce allocations and improve latency. [#17860](prometheus/prometheus#17860)
- \[PERF] API: Compute `/api/v1/targets/relabel_steps` in a single pass instead of re-running relabeling for each prefix. [#17969](prometheus/prometheus#17969)
- \[PERF] tsdb: Optimize LabelValues intersection performance for matchers. [#18069](prometheus/prometheus#18069)
- \[BUGFIX] PromQL: Prevent query strings containing only UTF-8 continuation bytes from crashing Prometheus. [#17735](prometheus/prometheus#17735)
- \[BUGFIX] Web: Fix missing `X-Prometheus-Stopping` header for `/-/ready` endpoint in `NotReady` state. [#17795](prometheus/prometheus#17795)
- \[BUGFIX] PromQL: Fix PromQL `info()` function returning empty results when filtering by a label that exists on both the input metric and `target_info`. [#17817](prometheus/prometheus#17817)
- \[BUGFIX] TSDB: Fix a bug during exemplar buffer grow/shrink that could cause exemplars to be incorrectly discarded. [#17863](prometheus/prometheus#17863)
- \[BUGFIX] UI: Fix broken graph display after page reload, due to broken Y axis min encoding/decoding. [#17869](prometheus/prometheus#17869)
- \[BUGFIX] TSDB: Fix memory leaks in buffer pools by clearing reference fields (Labels, Histogram pointers, metadata strings) before returning buffers to pools. [#17879](prometheus/prometheus#17879)
- \[BUGFIX] PromQL: info function: fix series without identifying labels not being returned. [#17898](prometheus/prometheus#17898)
- \[BUGFIX] OTLP: Filter `__name__` from OTLP attributes to prevent duplicate labels. [#17917](prometheus/prometheus#17917)
- \[BUGFIX] TSDB: Fix division by zero when computing stale series ratio with empty head. [#17952](prometheus/prometheus#17952)
- \[BUGFIX] OTLP: Fix potential silent data loss for sum metrics. [#17954](prometheus/prometheus#17954)
- \[BUGFIX] PromQL: Fix smoothed interpolation across counter resets. [#17988](prometheus/prometheus#17988)
- \[BUGFIX] PromQL: Fix panic with `@` modifier on empty ranges. [#18020](prometheus/prometheus#18020)
- \[BUGFIX] PromQL: Fix `avg_over_time` for a single native histogram. [#18058](prometheus/prometheus#18058)
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otlptranslator: Error silently swallowed in addSumNumberDataPoints

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