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feat(stats)!: per-field cardinality limits - #2211
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gh-worker-dd-mergequeue-cf854d[bot] merged 42 commits intoJul 29, 2026
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LGTM, although I think we should make sure that this is shipped in the same release as the telemetry PR
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…2170) # What does this PR do? - Add additional metric tags to the stats aggregation key. For each configured key, the matching span meta tag is included in the key and populates `ClientGroupedStats.additional_metric_tags`. - Limit the number of keys for `additional_metric_tags` to 4, not configurable. - Limit the maximum length of individual additional_metric_tags values to 200 characters, not configurable. Values exceeding this are replaced with `tracer_blocked_value`. # Motivation - Allow Serverless Compatibility Layer to send additional metric tags on trace stats. See [RFC](https://datadoghq.atlassian.net/wiki/spaces/APM/pages/6482919540/PENDING+Span-Derived+Primary+Tags+-+V1). - DataDog/serverless-components#140 to follow. - https://datadoghq.atlassian.net/browse/SVLS-8787 # Additional Notes Additional metric tags still need to be implemented in libdd-data-pipeline. Omitted from this PR since the goal of this PR is to support additional metric tags tags for Serverless without affecting other teams. https://github.com/DataDog/libdatadog/blob/42e3296aa3fa76749caf5d96b5bbf1ff2b1913b6/libdd-data-pipeline/src/trace_exporter/stats.rs#L146 Per-field cardinality limit for additional metric tags will be implemented in a following PR, #2211. - Limit the number of distinct aggregation entries per bucket that carry additional metric tags to 100 by default, configurable via `additional_metric_tags_max_entries`. Once exceeded, new entries have their tag values masked to `tracer_blocked_value`. --- Implementing additional metric tags instead of span derived primary tags. See previous PR for span derived primary tags - #1815. # How to test the change? - Unit tests - Deploy to Azure Functions with the following environment variables and validate that additional tags appear on trace metrics * `DD_TAGS: custom.primary:val,workload:azure_functions` * `DD_TRACE_EXPERIMENTAL_FEATURES_ENABLED: true` * `DD_TRACE_STATS_ADDITIONAL_TAGS: custom.primary,workload` <img width="685" height="411" alt="Screenshot 2026-07-06 at 3 39 47 PM" src="https://github.com/user-attachments/assets/b91495b6-11aa-4051-922f-63655666c4e5" /> Co-authored-by: duncan.harvey <duncan.harvey@datadoghq.com>
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) # Release proposal for libdd-data-pipeline, libdd-telemetry and their dependencies This PR contains version bumps based on public API changes and commits since last release. ## libdd-ddsketch **Next version:** `1.1.1` **Semver bump:** `patch` **Tag:** `libdd-ddsketch-v1.1.1` ### Commits - refactor: migrate to workspace dependencies, phase 4 (#2296) - chore: moving to workspace-level dependencies, phase 2 (#2270) ## libdd-shared-runtime **Next version:** `3.0.0` **Semver bump:** `major` **Tag:** `libdd-shared-runtime-v3.0.0` ###⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 - `libdd-capabilities-impl`: ^3.0.0 → ^4.0.0 ### Commits - feat(shared-runtime): add block_on_with_timeout to BlockingRuntime (#2333) - chore(runtime): restart all workers on invalid state (#2262) - refactor: migrate to workspace dependencies, phase 3 (#2283) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) ## libdd-dogstatsd-client **Next version:** `5.0.0` **Semver bump:** `major` **Tag:** `libdd-dogstatsd-client-v5.0.0` ### Commits - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(dogstatsd)!: add shared_runtime buffered sink (#2224) - refactor(statsd)!: make client clonable (#2222) ## libdd-telemetry **Next version:** `7.0.0` **Semver bump:** `major` **Tag:** `libdd-telemetry-v7.0.0` ### Commits - refactor(rc)!: make conversion from RemoteConfigProduct back and forth generally available (#2325) - feat(telemetry)!: Add Installation signature and AppProduct changes payloads (#2213) - fix(telemetry)!: stop sending Connection: close to the Agent (#2286) - refactor: migrate to workspace dependencies, phase 3 (#2283) - chore: moving to workspace-level dependencies, phase 2 (#2270) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - fix: drain the mailbox before stopping (#2258) - feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter (#2172) - fix(sidecar): don't double-encode file:// telemetry endpoints (#2230) ## libdd-trace-obfuscation **Next version:** `6.0.0` **Semver bump:** `major` **Tag:** `libdd-trace-obfuscation-v6.0.0` ###⚠️ major bump forced due to: - `libdd-trace-utils`: ^9.0.0 → ^10.1.0 ### Commits - refactor: migrate to workspace dependencies, phase 4 (#2296) - chore(lint): update nightly (#2281) - chore: moving to workspace-level dependencies, phase 2 (#2270) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - fix: new clippy lints (#2219) ## libdd-trace-stats **Next version:** `7.0.0` **Semver bump:** `major` **Tag:** `libdd-trace-stats-v7.0.0` ###⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 - `libdd-capabilities-impl`: ^3.0.0 → ^4.0.0 - `libdd-dogstatsd-client`: ^4.0.0 → ^5.0.0 - `libdd-telemetry`: ^6.0.0 → ^7.0.0 - `libdd-trace-utils`: ^9.0.0 → ^10.1.0 ### Commits - feat: add v1 isolated bricks for trace exporter (#2280) - refactor: migrate to workspace dependencies, phase 4 (#2296) - feat(data-pipeline)!: add compression option for agentless export (#2205) - feat(stats)!: per-field cardinality limits (#2211) - refactor: migrate to workspace dependencies, phase 3 (#2283) - feat(stats)!: string field length limit (#2267) - feat(trace_exporter)!: add `restart_after_fork` configuration option [APMSP-3843] (#2263) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(stats)!: implement additional metric tags in libdd-trace-stats (#2170) - refactor(statsd)!: make client clonable (#2222) - fix(stats-exporter): disable retries for stats payload sends (#2249) - feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter (#2172) - fix!: css obfuscation logic (#2203) ## libdd-data-pipeline **Next version:** `8.0.0` **Semver bump:** `major` **Tag:** `libdd-data-pipeline-v8.0.0` ###⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 - `libdd-capabilities-impl`: ^3.0.0 → ^4.0.0 - `libdd-dogstatsd-client`: ^4.0.0 → ^5.0.0 - `libdd-telemetry`: ^6.0.0 → ^7.0.0 - `libdd-trace-stats`: ^6.0.0 → ^7.0.0 - `libdd-trace-utils`: ^9.0.0 → ^10.1.0 ### Commits - fix(trace-exporter): mark OTLP client-computed stats (#2245) - feat(data-pipeline): adds new attributes to OTLP trace metrics export (#2316) - feat: add v1 isolated bricks for trace exporter (#2280) - feat(data-pipeline)!: add flush_and_close to the trace buffer (#2313) - feat(telemetry)!: Add Installation signature and AppProduct changes payloads (#2213) - refactor: migrate to workspace dependencies, phase 4 (#2296) - feat(data-pipeline)!: add compression option for agentless export (#2205) - fix(telemetry)!: stop sending Connection: close to the Agent (#2286) - feat(stats)!: per-field cardinality limits (#2211) - refactor: migrate to workspace dependencies, phase 3 (#2283) - feat(stats)!: string field length limit (#2267) - refactor(trace-utils)!: split generic TracerHeaderTags (#2279) - chore: moving to workspace-level dependencies, phase 2 (#2270) - feat(trace_exporter)!: add `restart_after_fork` configuration option [APMSP-3843] (#2263) - feat(data-pipeline): emit additional_metric_tags on OTLP span duration metric (#2264) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(dogstatsd)!: add shared_runtime buffered sink (#2224) - feat(stats)!: implement additional metric tags in libdd-trace-stats (#2170) - refactor(statsd)!: make client clonable (#2222) - feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter (#2172) - feat(trace_exporter)!: remove deprecated methods (#2250) - feat(trace-utils)!: add v1 decoder (#2174) - feat(trace-utils)!: add encoder v1 to v04 + refactor (#2145) - feat(otlp): add instrumentation scope metadata (#2235) - fix(trace-utils)!: serialize v0.5 span links and events into meta (#980) - fix!: css obfuscation logic (#2203) - test(data-pipeline): gate telemetry-only tests behind the telemetry feature (#2204) [APMSP-3843]: https://datadoghq.atlassian.net/browse/APMSP-3843?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: hoolioh <107922352+hoolioh@users.noreply.github.com>
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What does this PR do?
Implement per-key cardinality limits to stats computation.
Also:
[]->[tracer_blocked_value]encode_grouped_statsmeta with empty value:key:->key(breaking change ?)Motivation
CSS spec compliance.
Additional Notes
Todo:
How to test the change?