feat: added file capability [APMSP-3780] by Aaalibaba42 · Pull Request #2240 · DataDog/libdatadog

Aaalibaba42 · 2026-07-15T09:59:06Z

What does this PR do?

Added Capability to read, write, and have metadata about files

Motivation

dd-trace-js needing to add info from the /proc in their requests, it's better to have libdatadog drive the call

Additional Notes

Nop

How to test the change?

check, tests, check for wasm32

datadog-prod-us1-6 · 2026-07-15T10:03:47Z

Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 75.97%
• Overall Coverage: 74.64% (-0.00%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: cbdc5a0 | Docs | Datadog PR Page | Give us feedback!}

dd-octo-sts · 2026-07-15T10:44:44Z

Artifact Size Benchmark Report

aarch64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so	8.13 MB	8.13 MB	0% (0 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a	88.18 MB	88.18 MB	+0% (+1.28 KB) 👌

aarch64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.93 MB	10.93 MB	+0% (+160 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a	99.46 MB	99.46 MB	+0% (+480 B) 👌

libdatadog-x64-windows

Artifact	Baseline	Commit	Change
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.dll	26.59 MB	26.59 MB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.lib	89.18 KB	89.18 KB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.pdb	191.30 MB	191.38 MB	+.04% (+88.00 KB) 🔍
/libdatadog-x64-windows/debug/static/datadog_profiling_ffi.lib	1.04 GB	1.04 GB	+.08% (+883.73 KB) 🔍
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.dll	8.66 MB	8.66 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.lib	89.18 KB	89.18 KB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.pdb	25.36 MB	25.36 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/static/datadog_profiling_ffi.lib	50.55 MB	50.55 MB	+0% (+260 B) 👌

libdatadog-x86-windows

Artifact	Baseline	Commit	Change
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.dll	23.16 MB	23.16 MB	-0% (-512 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.lib	90.58 KB	90.58 KB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.pdb	195.94 MB	196.06 MB	+.05% (+120.00 KB) 🔍
/libdatadog-x86-windows/debug/static/datadog_profiling_ffi.lib	1.03 GB	1.03 GB	+.08% (+881.37 KB) 🔍
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.dll	6.68 MB	6.68 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.lib	90.58 KB	90.58 KB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.pdb	27.26 MB	27.26 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/static/datadog_profiling_ffi.lib	48.13 MB	48.13 MB	+0% (+302 B) 👌

x86_64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a	78.64 MB	78.64 MB	+0% (+1.88 KB) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so	9.05 MB	9.05 MB	0% (0 B) 👌

x86_64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a	94.14 MB	94.14 MB	+0% (+1.25 KB) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so	11.02 MB	11.02 MB	+0% (+144 B) 👌

pr-commenter · 2026-07-15T11:01:43Z

Benchmarks

Comparison

Benchmark execution time: 2026-07-22 10:24:33

Comparing candidate commit cbdc5a0 in PR branch jwiriath/file-caps with baseline commit 63ecad5 in branch main.

Found 5 performance improvements and 0 performance regressions! Performance is the same for 137 metrics, 0 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

🟩 = significantly better candidate vs. baseline
🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

scenario:otlp/map_to_prost/1x1000

🟩 execution_time [-111.503µs; -110.319µs] or [-6.582%; -6.512%]

scenario:vec_map/dedup/dup_1_in_10/8

🟩 execution_time [-55.496ns; -49.276ns] or [-12.472%; -11.074%]

scenario:vec_map/dedup/dup_1_in_2/8

🟩 execution_time [-58.654ns; -54.187ns] or [-9.541%; -8.815%]

scenario:vec_map/dedup/dup_1_in_4/8

🟩 execution_time [-59.860ns; -55.929ns] or [-11.667%; -10.901%]

scenario:vec_map/dedup/no_duplicates/8

🟩 execution_time [-75.547ns; -71.548ns] or [-17.675%; -16.740%]

Benchmark execution time: 2026-07-22 10:39:55

Comparing candidate commit cbdc5a0 in PR branch jwiriath/file-caps with baseline commit 63ecad5 in branch main.

Found 3 performance improvements and 0 performance regressions! Performance is the same for 174 metrics, 10 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

🟩 = significantly better candidate vs. baseline
🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

scenario:alloc_free/system/4096

🟩 execution_time [-10.610ns; -10.454ns] or [-11.203%; -11.039%]

scenario:glob_matcher/ascii_wildcard_question_match/wall_time

🟩 execution_time [-23.925ns; -23.895ns] or [-39.351%; -39.302%]

scenario:glob_matcher/ascii_wildcard_star_match/wall_time

🟩 execution_time [-23.545ns; -23.527ns] or [-38.973%; -38.944%]

Candidate

Omitted due to size.

Baseline

Omitted due to size.

Aaalibaba42 · 2026-07-20T12:24:09Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-07-20T12:24:12Z

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2026-07-20 13:17:10 UTC ℹ️ MergeQueue: merge request added to the queue

The expected merge time in main is approximately 1h (p90).

2026-07-20 13:44:06 UTC ℹ️ MergeQueue: Readding this merge request to the queue because another merge request processed with yours failed. No action is needed from your side.

2026-07-20 14:33:56 UTC ❌ MergeQueue: The checks failed on this merge request

Tests failed on this commit d24f70b:

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Investigate the failures and when ready, re-add your pull request to the queue!
If your PR checks are green, try to rebase/merge. It might be because the CI run is a bit old.
Any question, go check the FAQ.

Aaalibaba42 · 2026-07-20T15:09:11Z

/merge

Aaalibaba42 · 2026-07-21T14:34:49Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-07-21T14:34:53Z

View all feedbacks in Devflow UI.

2026-07-21 14:34:53 UTC ℹ️ Start processing command /merge

2026-07-21 14:35:00 UTC ℹ️ MergeQueue: waiting for PR to be ready

This pull request is not mergeable according to GitHub. Common reasons include pending required checks, missing approvals, or merge conflicts — but it could also be blocked by other repository rules or settings.
It will be added to the queue as soon as checks pass and/or get approvals. View in MergeQueue UI.
Note: if you pushed new commits since the last approval, you may need additional approval.
You can remove it from the waiting list with /remove command.

2026-07-21 19:32:09 UTC ⚠️ MergeQueue: This merge request was unqueued

devflow unqueued this merge request: It did not become mergeable within the expected time

Aaalibaba42 · 2026-07-22T10:45:42Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-07-22T10:45:46Z

View all feedbacks in Devflow UI.

2026-07-22 10:45:46 UTC ℹ️ Start processing command /merge

2026-07-22 10:45:50 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 1h (p90).

2026-07-22 11:28:59 UTC ℹ️ MergeQueue: This merge request was merged

…er-flare (#2332) # Release proposal for libdd-ffe, libdd-http-client, libdd-tracer-flare and their dependencies This PR contains version bumps based on public API changes and commits since last release. ## libdd-capabilities **Next version:** `3.0.0` **Semver bump:** `major` **Tag:** `libdd-capabilities-v3.0.0` ### Commits - fix(telemetry)!: stop sending Connection: close to the Agent (#2286) - feat(capabilities)!: Add streaming to http capabilities (#2251) - feat: added file capability [APMSP-3780] (#2240) - feat: added environment capability [APMSP-3780] (#2239) ## libdd-common **Next version:** `5.1.1` **Semver bump:** `patch` **Tag:** `libdd-common-v5.1.1` ### Commits - feat(telemetry)!: Add Installation signature and AppProduct changes payloads (#2213) - refactor: migrate to workspace dependencies, phase 4 (#2296) - refactor: migrate to workspace dependencies, phase 3 (#2283) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - test: stabilize flaky tests (#2256) - fix(sidecar): don't double-encode file:// telemetry endpoints (#2230) - fix: last new clippy lint (#2221) ## libdd-tinybytes **Next version:** `1.1.2` **Semver bump:** `patch` **Tag:** `libdd-tinybytes-v1.1.2` ### Commits - chore: moving to workspace-level dependencies, phase 2 (#2270) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) ## libdd-trace-protobuf **Next version:** `4.0.1` **Semver bump:** `patch` **Tag:** `libdd-trace-protobuf-v4.0.1` ### Commits - refactor: migrate to workspace dependencies, phase 4 (#2296) - chore: moving to workspace-level dependencies, phase 2 (#2270) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(stats)!: implement additional metric tags in libdd-trace-stats (#2170) ## libdd-capabilities-impl **Next version:** `4.0.0` **Semver bump:** `major` **Tag:** `libdd-capabilities-impl-v4.0.0` ### ⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 ### Commits - feat(telemetry)!: Add Installation signature and AppProduct changes payloads (#2213) - refactor: migrate to workspace dependencies, phase 4 (#2296) - fix(telemetry)!: stop sending Connection: close to the Agent (#2286) - fix(remote-config)!: Expose HttpClientCapability in remote config (#2252) - feat(capabilities)!: Add streaming to http capabilities (#2251) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat: added file capability [APMSP-3780] (#2240) - feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter (#2172) - feat: added environment capability [APMSP-3780] (#2239) ## libdd-http-client **Next version:** `1.0.0` **Semver bump:** `major` **Tag:** `libdd-http-client-v1.0.0` **Warning:** this is an initial release. Please verify that the version and commits included are correct. ## libdd-trace-normalization **Next version:** `3.0.1` **Semver bump:** `patch` **Tag:** `libdd-trace-normalization-v3.0.1` ### Commits - refactor: migrate to workspace dependencies, phase 4 (#2296) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) ## libdd-remote-config **Next version:** `3.0.0` **Semver bump:** `major` **Tag:** `libdd-remote-config-v3.0.0` ### Commits - refactor(rc)!: make conversion from RemoteConfigProduct back and forth generally available (#2325) - fix(wasm)!: finish the WASM port of remote-config (#2315) - refactor: migrate to workspace dependencies, phase 3 (#2283) - feat(rc): Handle expired config status (#2274) - feat(remote-config)!: add AsmRawResponseBody capability (#2278) - chore: moving to workspace-level dependencies, phase 2 (#2270) - fix(remote-config)!: Expose HttpClientCapability in remote config (#2252) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - fix(rc): Make Target fields available again after eaf5ad0 (#2232) - fix: new clippy lints (#2219) ## libdd-trace-utils **Next version:** `10.0.0` **Semver bump:** `major` **Tag:** `libdd-trace-utils-v10.0.0` ### ⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 ### Commits - refactor(rc)!: make conversion from RemoteConfigProduct back and forth generally available (#2325) - fix(libdd-trace-utils): apply SpanLink flags masking when v0.5 json encoding (#2314) - refactor: migrate to workspace dependencies, phase 4 (#2296) - feat(data-pipeline)!: add compression option for agentless export (#2205) - refactor: migrate to workspace dependencies, phase 3 (#2283) - refactor(trace-utils)!: split generic TracerHeaderTags (#2279) - chore(lint): update nightly (#2281) - chore: moving to workspace-level dependencies, phase 2 (#2270) - fix(remote-config)!: Expose HttpClientCapability in remote config (#2252) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(stats)!: implement additional metric tags in libdd-trace-stats (#2170) - 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) ## libdd-ffe **Next version:** `1.0.0` **Semver bump:** `major` **Tag:** `libdd-ffe-v1.0.0` **Warning:** this is an initial release. Please verify that the version and commits included are correct. ## libdd-tracer-flare **Next version:** `1.0.0` **Semver bump:** `major` **Tag:** `libdd-tracer-flare-v1.0.0` **Warning:** this is an initial release. Please verify that the version and commits included are correct. [APMSP-3780]: https://datadoghq.atlassian.net/browse/APMSP-3780?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ [APMSP-3780]: https://datadoghq.atlassian.net/browse/APMSP-3780?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ [APMSP-3780]: https://datadoghq.atlassian.net/browse/APMSP-3780?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>

Aaalibaba42 requested review from a team as code owners July 15, 2026 09:59

Aaalibaba42 force-pushed the jwiriath/file-caps branch from 083f9c2 to 8e15735 Compare July 15, 2026 10:00

Aaalibaba42 force-pushed the jwiriath/file-caps branch from 8e15735 to 1a4ea68 Compare July 15, 2026 10:06

Aaalibaba42 changed the title ~~feat: added file capability~~ feat: added file capability [APMSP-3780] Jul 15, 2026

Aaalibaba42 force-pushed the jwiriath/file-caps branch from d794743 to cc69e41 Compare July 16, 2026 09:29

Aaalibaba42 added 2 commits July 17, 2026 11:36

feat: added file capability

0128826

chore: fmt

241117c

Aaalibaba42 force-pushed the jwiriath/file-caps branch from cc69e41 to 241117c Compare July 17, 2026 09:37

VianneyRuhlmann approved these changes Jul 20, 2026

View reviewed changes

Comment thread libdd-capabilities-impl/src/file.rs Outdated

yannham approved these changes Jul 20, 2026

View reviewed changes

Comment thread libdd-capabilities-impl/src/file.rs Outdated

chore: remove inmemoryfs mocks since we don't use them currently

0a022c8

gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: waiting mergequeue-status: queued mergequeue-status: in_progress mergequeue-status: retrying and removed mergequeue-status: waiting mergequeue-status: queued mergequeue-status: in_progress mergequeue-status: retrying labels Jul 20, 2026

gh-worker-devflow-routing-ef8351 Bot mentioned this pull request Jul 20, 2026

feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter #2172

Merged

gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: rejected and removed mergequeue-status: in_progress labels Jul 20, 2026

gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: waiting mergequeue-status: removed and removed mergequeue-status: rejected mergequeue-status: waiting labels Jul 20, 2026

Aaalibaba42 added 5 commits July 21, 2026 12:05

Merge branch 'main' into jwiriath/file-caps

41e89a1

Merge branch 'main' into jwiriath/file-caps

91a4834

Merge branch 'main' into jwiriath/file-caps

b2a5980

Merge branch 'main' into jwiriath/file-caps

8673f91

Merge branch 'main' into jwiriath/file-caps

95ea2bf

gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: waiting and removed mergequeue-status: removed labels Jul 21, 2026

Merge branch 'main' into jwiriath/file-caps

6c23af7

gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: removed and removed mergequeue-status: waiting labels Jul 21, 2026

Merge branch 'main' into jwiriath/file-caps

cbdc5a0

gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: queued mergequeue-status: in_progress and removed mergequeue-status: removed mergequeue-status: queued labels Jul 22, 2026

gh-worker-dd-mergequeue-cf854d Bot merged commit 3081603 into main Jul 22, 2026
101 checks passed

gh-worker-dd-mergequeue-cf854d Bot deleted the jwiriath/file-caps branch July 22, 2026 11:28

gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: done and removed mergequeue-status: in_progress labels Jul 22, 2026

dd-octo-sts Bot mentioned this pull request Jul 30, 2026

chore(release): proposal for libdd-http-client, libdd-tracer-flare #2299

Closed

dd-octo-sts Bot mentioned this pull request Aug 7, 2026

chore(release): proposal for libdd-ffe, libdd-http-client, libdd-tracer-flare #2332

Merged

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feat: added file capability [APMSP-3780] - #2240

feat: added file capability [APMSP-3780]#2240
gh-worker-dd-mergequeue-cf854d[bot] merged 11 commits into
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jwiriath/file-caps

Aaalibaba42 commented Jul 15, 2026

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Aaalibaba42 commented Jul 15, 2026

What does this PR do?

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scenario:otlp/map_to_prost/1x1000

scenario:vec_map/dedup/dup_1_in_10/8

scenario:vec_map/dedup/dup_1_in_2/8

scenario:vec_map/dedup/dup_1_in_4/8

scenario:vec_map/dedup/no_duplicates/8

Explanation

More details about the CI and significant changes

scenario:alloc_free/system/4096

scenario:glob_matcher/ascii_wildcard_question_match/wall_time

scenario:glob_matcher/ascii_wildcard_star_match/wall_time

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datadog-prod-us1-6 Bot commented Jul 15, 2026 •

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