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feat: add runtime resource snapshots - #421
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AjayThorve merged 31 commits intoOct 21, 2026
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Applications can read a runtime's identity and status but not how much memory or CPU its adapter host tree uses. Issue NVIDIA#267 asks for a timestamped snapshot on the runtime API and a final snapshot on RunResult that reuses the same type. Add RuntimeResourceSnapshot and runtime_resource_snapshot(plan, runtime) with typed ResourceObservationUnavailable and ResourceObservationUnsupported errors. Linux reads /proc and macOS reads proc_pid_rusage, so no dependency is added; other platforms return Unsupported. The host PID lives in a map beside LOCAL_HOSTS, so a snapshot never waits for the host mutex a running invocation holds. Each local invocation's RunResult carries one final snapshot, and a failed read leaves it unset instead of failing the run. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Python applications need the same snapshot as Rust callers, with the same typed failures, to monitor a runtime while an invocation runs. Add Runtime.resource_snapshot(), the RuntimeResourceSnapshot type, RunResult.resource_snapshot, and ResourceObservationUnavailableError and ResourceObservationUnsupportedError (FabricRuntimeError subclasses). The PyO3 binding raises dedicated native exceptions so the SDK maps them by type rather than by message text. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Issue NVIDIA#267 requires the fixed measurement scope to be documented and observation to be kept distinct from resource enforcement. Describe the fields, the adapter host plus descendants scope, the typed errors, the CPU caveats for per-invocation deltas, and that limits belong to the operating system or execution environment, in the SDK guide and the integration skill reference. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Linux counts an exited descendant's CPU before its parent waits for it, while macOS counts it only after the wait. The field docs said only waited-for descendants count, which understated Linux. Say both, and re-wrap the integration skill paragraph. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Every entry the macOS reader queues already carries the rusage it was filtered on, so the optional value and the fallback re-read were dead paths. Queue the usage directly. Behavior is unchanged. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The macOS reader listed each child's PID and parent, then read the child's usage later by PID alone. A child that exited after the listing could have its PID reused by an unrelated process, whose usage was then counted in the runtime's snapshot. The listing now keeps each child's parent and start time, and the child's usage is counted only when the same parent and start time read back after the usage read. The host is read after the listing, so its listed children are known to be its own. The libproc calls sit behind a small trait so tests can script the reuse. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
…e read Both readers turned every failed read into "skip this process", so a child that had exited and a live child that could not be inspected gave the same successful, smaller snapshot. NVIDIA#267 asks for an inaccessible runtime to return ResourceObservationUnavailable and for unavailable measurements never to read as zero. Each read now reports whether the process is gone or unreadable. A gone or replaced child is still skipped. A live process in the tree that cannot be read, or a process table that cannot be listed in full, now returns ResourceObservationUnavailable with the reason. On macOS the listing falls back to the short BSD record for another user's process, so its parent is still known, and such a process inside the tree makes the snapshot unavailable. The Linux reads move behind the same kind of trait as macOS so tests can script denied, reaped and replaced processes. A new test covers a snapshot after an invocation timeout. The SDK guide, error docstrings and skill reference now name the new condition, and say that discovery reads other processes' parent IDs and start times while the snapshot exposes only its own fields. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Each local invocation reads a snapshot while it holds its host's lock. The Linux reader parsed /proc/<pid>/stat for every process on the machine, so the cost grew with the machine's process count. In a release build in Docker (rust:1.94, aarch64), the median over 60 reads was 0.66 ms with 108 processes, 5.8 to 7.1 ms with 1,008, 35 to 38 ms with 5,008 and 72 to 74 ms with 10,008. The reader now lists each process's children from /proc/<pid>/task/<tid>/children and reads only the runtime's tree. The same benchmark reads 0.027 to 0.028 ms at every process count. A child counts only when its stat, read after the listing, still names the expected parent. The kernel can skip a live child when a sibling is reaped during the read, so the children list is read until two reads agree, and the snapshot is unavailable after four reads that differ. Kernels without children files keep the full scan. Also name the macOS children map type, which clippy flagged. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The FabricError, runtime_resource_snapshot, resource_snapshot module and Python error docstrings now name an unreadable live process as a cause of ResourceObservationUnavailable, and the module docs describe how each reader finds the tree. Regenerated with Rust 1.94.0 and the locked docs tools; only the changed sentences are applied. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The macOS reader listed every process on the machine and read each one's parent to find the runtime's tree. That needed a short BSD record fallback for other users' processes, made a snapshot unavailable when any process on the machine refused both records, and dropped an exited child that its parent had not yet waited for out of CPU time, because PROC_PIDTBSDINFO fails on a zombie. The reader now lists each process's children with proc_listchildpids, as the Linux reader does with /proc children files. proc_listchildpids lists zombies and proc_pid_rusage reads them, so an unreaped child's CPU time counts on macOS the same way it does on Linux. A child counts only when it started before its parent's children were listed, which proves its PID was not reused after the listing. The walk now lives outside the platform modules behind one ProcessTable trait, so its scripted tests run on Linux CI for both identity rules. The Linux reader reports a children list that never settles as a changing tree instead of an unreadable process. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
On macOS, a descendant that runs as another user, including the setuid programs ps, top, and sudo, cannot be read, so the snapshot is unavailable while it runs. The docs now name those programs. Unsupported is also returned for the http and native_plugin adapter kinds, which the error docs left out. RunResult.resource_snapshot is None when the final read fails, and the docs now say that the snapshot call returns the error behind it. The SDK API inventory lists Runtime.resource_snapshot(). Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The test checks that a snapshot mapping round-trips and that invalid fields raise FabricConfigError, so its name now says both. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Picks up the macOS reader, Unsupported adapter kind, and RunResult snapshot wording from the Rust and Python docstrings. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
RunResult.resource_snapshot docs said that runtime_resource_snapshot returns the error behind a None. It does not: the final read's error is not kept, run_plan stops the runtime before a caller can ask, and a transient cause can be gone by the next read. The field now says only that it is absent when the runtime's resources could not be observed. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The Linux reader returns ResourceObservationUnavailable when 4 reads of a process's children never give two equal results in a row, because the runtime's process tree kept changing during the read. The public error docs listed only a stopped runtime, an exited host, and unreadable processes. They now list the changing tree too. On Linux with /proc mounted hidepid=invisible, another user's descendant reads as gone, so the snapshot leaves it out instead of reporting it unavailable. The module doc and the Python guide now say so. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Picks up the corrected RunResult.resource_snapshot field doc, the changing-tree unavailable reason, and the hidepid note from the Rust and Python docstrings. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The run record needs the same millisecond RFC 3339 timestamps as resource snapshots. Moving the formatter into crate::time gives core one copy of the civil date algorithm, so a later feature imports it instead of copying it. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The Linux tree walk accepted a child when its stat named the queued parent PID. If the parent and child both exited and other processes reused both PIDs with the same parent-child relation, the walk counted the unrelated process. The walk now reads the parent again after the child and counts the child only while the parent still has the start time it was counted with: a parent that is the same process after the child's read held its PID the whole time, so the child's parent PID names it. A parent that exited no longer shows that, so the child is skipped like a reparented one, and a parent that cannot be read makes the snapshot unavailable. Both Linux listings use the shared walk, so the check covers the children files and the fallback scan. The scripted regressions fail without it with 3 processes and 900 ns of CPU time from the unrelated process. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
With /proc mounted hidepid=invisible or hidepid=ptraceable, another user's process has no /proc entry, so the reader took a live descendant that changed user for an exited one and left it out of a successful snapshot. A missing /proc entry now counts as exited only when no process holds the PID, checked with signal 0; a PID that still names a process makes the snapshot unavailable. The kernel docs name kill -0 as the way to learn that a hidden PID exists. The fallback for a kernel without children files lists every process from /proc, where hidden processes are missing altogether. It now reads the /proc mount options and is unavailable under those two modes. With hidepid=noaccess, other users' processes stay listed and reading them fails, so the scan already reports the table as unreadable. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The SDK guide said a descendant hidden by hidepid=invisible is not counted. The reader now makes the snapshot unavailable instead, and the fallback for a kernel without children lists is unavailable under that mount, so the guide states both, for hidepid=ptraceable too. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The resource_snapshot module doc now says a descendant hidden by hidepid makes a snapshot unavailable. Regenerated with Rust 1.94.0; only this page changes. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
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WalkthroughThe change adds timestamped resource snapshots for local runtime process trees. Rust and Python APIs expose memory, process count, and CPU time, with distinct errors for unavailable and unsupported observations. Invocation results can include an optional snapshot. ChangesRuntime resource snapshots
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant PythonRuntime as Runtime.resource_snapshot
participant NativeBinding as _native.runtime_resource_snapshot
participant CoreAPI as runtime_resource_snapshot
participant SnapshotReader as snapshot_local_host
PythonRuntime->>NativeBinding: Send serialized plan and runtime
NativeBinding->>CoreAPI: Parse inputs and request snapshot
CoreAPI->>SnapshotReader: Read registered local-host process tree
SnapshotReader-->>CoreAPI: Return snapshot or observation error
CoreAPI-->>NativeBinding: Return serialized result
NativeBinding-->>PythonRuntime: Return snapshot JSON
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 49.60% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 125 functions across 13 files. (56 skippe… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Issue #267requires a runtime-level snapshot API with six fields for the local adapter host and descendants. The PR adds Rustruntime_resource_snapshot, PythonRuntime.resource_snapshot(), and opt…Out of Scope Changes check The changes remain within issue #267. Process readers, runtime integration, schemas, typed SDK errors, tests, and documentation implement or support the requested observation contract. Generated API r…Title check The title uses the allowed feattype, includes a concise imperative summary, is lowercase, has no trailing period, and is 36 characters long.Description check The description includes the required overview, reviewer starting point, related issue with the Closeskeyword, contribution confirmation, and duplicate-work confirmation. It also provides implement…Full details: Linked Issues check
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Explanation
Issue
#267requires a runtime-level snapshot API with six fields for the local adapter host and descendants. The PR adds Rustruntime_resource_snapshot, PythonRuntime.resource_snapshot(), and optionalRunResult.resource_snapshotusing the sharedRuntimeResourceSnapshottype. It adds typed unavailable and unsupported errors, Linux and macOS readers, privacy-preserving process-tree measurement, tests for active, stopped, exited, unsupported, and concurrent-stop cases, and documentation that separates observation from enforcement. The adapter contract remains unchanged.
Full details: Out of Scope Changes check
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Explanation
The changes remain within issue
#267. Process readers, runtime integration, schemas, typed SDK errors, tests, and documentation implement or support the requested observation contract. Generated API reference position updates support the new public entries. The non-local provider documentation clarifies an unsupported snapshot case. No unrelated enforcement, capacity management, lifecycle feature, or adapter-contract change is shown.
Full details: Description check
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Explanation
The description includes the required overview, reviewer starting point, related issue with the
Closeskeyword, contribution confirmation, and duplicate-work confirmation. It also provides implementation details and validation results.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 49.60% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 125 functions across 13 files. (56 skipped: 56 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @crates/fabric-core/src/resource_snapshot.rs:
- Around line 813-840: In the host-process test, make the child workload and CPU
assertion less sensitive to Linux CPU-tick rounding: increase the loop bound in
the shell command and/or lower the threshold in the exited.cpu_time_seconds
assertion, while still verifying that exited-child CPU time is counted.
Review comments at
@docs/reference/api/python-library-reference/nemo_fabric.types.md:
- Line 1258: Update the source documentation for the timestamp descriptions to
use “NVIDIA NeMo Fabric” on first use and “NeMo Fabric” thereafter, replacing
standalone “Fabric” as the product name; then regenerate both affected reference
pages. In docs/reference/api/python-library-reference/nemo_fabric.types.md at
lines 1258–1258, correct the timestamp descriptions. In
docs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/struct-runtimeresourcesnapshot.mdx
at lines 17–17, correct the overview and timestamp descriptions at lines 17, 27,
and 31.
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crates/fabric-core/src/error.rscrates/fabric-core/src/lib.rscrates/fabric-core/src/resource_snapshot.rscrates/fabric-core/src/runtime.rscrates/fabric-core/src/schema.rscrates/fabric-core/src/time.rscrates/fabric-python/src/lib.rsdocs/reference/api/python-library-reference/index.mddocs/reference/api/python-library-reference/nemo_fabric.errors.mddocs/reference/api/python-library-reference/nemo_fabric.runtime.mddocs/reference/api/python-library-reference/nemo_fabric.types.mddocs/reference/api/rust-library-reference/nemo-fabric-core/adapter-contract/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/agent-config/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/agent-execution/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/config/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/doctor/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/error/enum-fabricerror.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/error/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/fn-version.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/struct-runtimeresourcesnapshot.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-runtime-resource-snapshot.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-start-runtime-with-service.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-start-runtime.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-stop-runtime.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/struct-runresult.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/schema/enum-schemaname.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/schema/index.mdxdocs/sdk/python.mdxschemas/SCHEMA.mdschemas/sdk/run-result.schema.jsonschemas/sdk/runtime-resource-snapshot.schema.jsonsdk/python/nemo-fabric-runtime/src/nemo_fabric/__init__.pysdk/python/nemo-fabric-runtime/src/nemo_fabric/_native.pyisdk/python/nemo-fabric-runtime/src/nemo_fabric/errors.pysdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime.pysdk/python/nemo-fabric-runtime/src/nemo_fabric/types.pyskills/nemo-fabric-integrate/references/results-and-errors.mdskills/nemo-fabric-integrate/references/sdk-api-inventory.mdtests/python/test_runtime_resource_snapshot.py
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Review Python SDK changes for typed API consistency, import-time dependency neutrality, async/session behavior, and parity with the native extension.
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Treat native binding changes as public API changes.
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Enforce the product name in user-facing prose: use "NVIDIA NeMo Fabric" on first use and "NeMo Fabric" thereafter.
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Schemas are generated public contract snapshots.
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schemas/SCHEMA.mdschemas/sdk/run-result.schema.jsonschemas/sdk/runtime-resource-snapshot.schema.json
Tests should cover the behavior promised by the changed API surface, including error paths, lifecycle cleanup, and SDK/native parity where relevant.
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Applicability reference: AGENTS.md: # AGENTS.md Keep public bindings current when the API changes: `docs/sdk/python.mdx` for the Python SDK; `adapter-contract/python/` and `adapter-contract/typescript/` for the southbound adapter contract;...
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Source excerpt: In MDX files, top-of-file comments must use JSX comment delimiters: `{/*` to open and `*/}` to close.
📄 CodeRabbit inference engine (.agents/skills/contribute-docs/SKILL.md)
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/config/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/struct-runtimeresourcesnapshot.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/agent-execution/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/adapter-contract/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-stop-runtime.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/schema/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/agent-config/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/error/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-start-runtime-with-service.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/doctor/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/schema/enum-schemaname.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-start-runtime.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/struct-runresult.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/fn-version.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-runtime-resource-snapshot.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/error/enum-fabricerror.mdxdocs/sdk/python.mdx
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📄 CodeRabbit inference engine (.agents/skills/review-doc-style/SKILL.md)
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/config/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/struct-runtimeresourcesnapshot.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/agent-execution/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/adapter-contract/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-stop-runtime.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/schema/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/agent-config/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/error/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-start-runtime-with-service.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/doctor/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/schema/enum-schemaname.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-start-runtime.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/struct-runresult.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/fn-version.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/runtime/fn-runtime-resource-snapshot.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/error/enum-fabricerror.mdxdocs/sdk/python.mdx
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📄 CodeRabbit inference engine (.agents/skills/review-doc-style/SKILL.md)
Files:
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Applicability reference: AGENTS.md: # AGENTS.md NeMo Fabric ships two tiers of agent skills.
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Files:
skills/nemo-fabric-integrate/references/sdk-api-inventory.mdskills/nemo-fabric-integrate/references/results-and-errors.md
Source excerpt: [ ] Any Rust change ran `just test-rust` Source excerpt: [ ] Any Rust change ran `cargo fmt --all -- --check` Source excerpt: [ ] `crates/fabric-core` changes ran both the Rust and Python suites
📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)
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📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)
Files:
crates/fabric-python/src/lib.rs
🧠 Learnings: 1
📚 Learning: 2026-07-24T16:07:22.255Z
Learnt from: AjayThorve
Repo: NVIDIA/NeMo-Fabric PR: 118
File: docs/reference/api/rust-library-reference/nemo-fabric-core/config/struct-adapterdescriptor.mdx:5-5
Timestamp: 2026-07-24T16:07:22.255Z
Learning: In this repo, files generated under `docs/reference/api/**` are NVIDIA NeMo Fabric API reference output. When reviewing changes to these generated pages, do not treat sidebar `position`/ordering updates as direct manual edits—these can be regenerated by running `just docs` after adding public types. Only flag substantive content changes that are not explained by generation.
Applied to files:
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🪛 ast-grep (0.45.3)
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime.py
[info] 767-767: use jsonify instead of json.dumps for JSON output
Context: json.dumps(self._plan.to_mapping())
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 768-768: use jsonify instead of json.dumps for JSON output
Context: json.dumps(self._runtime.to_mapping())
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
🪛 LanguageTool
docs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/index.mdx
[style] ~15-~15: Consider using “who” when you are referring to a person instead of an object.
Context: ...has already waited for. An exited child that is not yet waited for counts through it...
(THAT_WHO)
🔇 Additional comments: 16
crates/fabric-core/src/error.rs: 1
280-299: LGTM!crates/fabric-core/src/time.rs: 1
1-90: LGTM!crates/fabric-core/src/resource_snapshot.rs: 1
1-812: LGTM!Also applies to: 842-1278
crates/fabric-core/src/runtime.rs: 1
34-34: LGTM!Also applies to: 76-79, 144-147, 1175-1215, 1576-1576, 1674-1674, 1686-1689, 1873-1877, 1900-1900, 2052-2052, 2072-2072, 2228-2233, 4007-4010, 4745-4938
crates/fabric-core/src/lib.rs: 1
12-15: LGTM!Also applies to: 43-43, 52-53
crates/fabric-core/src/schema.rs: 1
16-16: LGTM!Also applies to: 69-75, 97-97, 124-124, 178-180, 216-216
crates/fabric-python/src/lib.rs: 1
27-38: LGTM!Also applies to: 261-274, 279-286, 300-300, 312-322
sdk/python/nemo-fabric-runtime/src/nemo_fabric/_native.pyi: 1
39-42: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/errors.py: 1
82-98: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/types.py: 1
1837-1901: LGTM!Also applies to: 1922-1924, 1942-1942, 1960-1960, 1987-1991
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime.py: 1
25-39: LGTM!Also applies to: 742-778, 1033-1052
sdk/python/nemo-fabric-runtime/src/nemo_fabric/__init__.py: 1
15-16: LGTM!Also applies to: 68-68, 115-124
schemas/sdk/run-result.schema.json: 1
282-327: LGTM!Also applies to: 409-419
schemas/sdk/runtime-resource-snapshot.schema.json: 1
1-48: LGTM!schemas/SCHEMA.md: 1
130-131: LGTM!tests/python/test_runtime_resource_snapshot.py: 1
1-211: LGTM!
The exited-child snapshot test required 0.1 s of CPU from a shell loop of 100,000 iterations. On a fast Linux runner with dash and 10 ms clock ticks the loop can finish in less, so the test could fail with a correct reader. The host only sleeps, so 0.02 s (two ticks) still proves that the exited child's CPU time is counted, with the same workload. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
The RuntimeResourceSnapshot overview, the started_at and observed_at descriptions, the LocalHostProcess::new doc comment and the Python docstring used a standalone "Fabric" for the product. The repository's naming rule asks for "NeMo Fabric" after first use. The two snapshot schemas are regenerated with just schemas; the TypeScript contract does not change. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Regenerated the Rust reference with Rust 1.94.0 and the Python reference with lazydocs; only the RuntimeResourceSnapshot page and the RuntimeResourceSnapshot attributes in the types page change. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
1 task done
The comment called the 20 ms threshold two 10 ms clock ticks, but the test also runs on macOS, where proc_pid_rusage reports CPU time in nanoseconds. It now says 20 ms is two ticks on Linux. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
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- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Review comments at @sdk/python/nemo-fabric-runtime/src/nemo_fabric/types.py:
- Around line 1846-1847: Update RuntimeResourceSnapshot.from_mapping() to parse
both started_at and observed_at as RFC 3339 timestamps and reject malformed
values or timestamps that are not UTC; do not accept them based only on being
non-empty strings.
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Review Python SDK changes for typed API consistency, import-time dependency neutrality, async/session behavior, and parity with the native extension.
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Enforce the product name in user-facing prose: use "NVIDIA NeMo Fabric" on first use and "NeMo Fabric" thereafter.
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crates/fabric-core/src/resource_snapshot.rs: 2
1-129: LGTM!
837-842: LGTM!schemas/sdk/run-result.schema.json: 1
283-283: LGTM!Also applies to: 292-292, 313-313
schemas/sdk/runtime-resource-snapshot.schema.json: 1
3-3: LGTM!Also applies to: 12-12, 33-33
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1258-1259: LGTM!docs/reference/api/rust-library-reference/nemo-fabric-core/resource-snapshot/struct-runtimeresourcesnapshot.mdx: 1
27-27: LGTM!Also applies to: 31-31
1 task done
RuntimeResourceSnapshot documents started_at and observed_at as RFC 3339 UTC, but from_mapping accepted any non-empty string, so values such as "yesterday" or a +02:00 offset passed validation. Parse both fields and reject values without the date-T-time form or with a nonzero UTC offset. The original string is kept unchanged. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
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- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
Review comments at @sdk/python/nemo-fabric-runtime/src/nemo_fabric/types.py:
- Line 78: Update the timestamp validation around the `datetime.fromisoformat`
calls to validate the complete RFC 3339 date-time form for both snapshot fields
before parsing. Reject basic-form timestamps such as `2026-10-14T180110Z`, even
when Python accepts them.
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datetime.fromisoformat also accepts basic ISO 8601 forms such as 2026-10-14T180110Z, so check the RFC 3339 date-time shape before parsing. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
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/nvskills-ci |
Bring in the explicit environment lifecycle SDK, the OpenShell environment provider, and multi-runtime sandboxes. FabricError keeps main's environment lifecycle variants and the resource observation variants, the crate root exports both main's lifecycle functions and runtime_resource_snapshot, and SchemaName::ALL grows to 23 entries for EnvironmentReference and RuntimeResourceSnapshot. Snapshots still read only runtimes on the local provider. Main starts no runtime on a non-local provider, and start_runtime_in() starts a local runtime through the same local adapter host, so its snapshot reads the same process tree. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Regenerate the Rust library reference with Rust 1.94.0 so it lists main's environment lifecycle items next to the resource snapshot items, with updated page positions. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Bring in Relay OpenTelemetry file sinks, OpenShell SDK runtimes in task sandboxes, the turnkey OpenShell echo example, and the OpenShell sandbox name limit fix. The crate root declares both main's task_command module and this branch's time module. Main's new RunResult round-trip test sets resource_snapshot to None, the field this branch adds. Snapshots still read only runtimes on the local provider. A runtime that main starts on the OpenShell provider gets ResourceObservationUnsupported from runtime_resource_snapshot, and its RunResult carries whatever the task side returned. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
Bring in the Claude adapter's per-invocation cost and cache token usage. No conflicts. Signed-off-by: mnajafian-nv <mnajafian@nvidia.com>
AjayThorve
approved these changes
Oct 21, 2026
This branch was previously deployed
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Overview
An application running an agent through NeMo Fabric can't see how much memory or CPU the agent's processes use during an invocation. Fabric starts those processes but reports nothing about them.
This change adds a resource snapshot of a local runtime: resident memory, live process count and cumulative CPU time for the adapter host and its descendants. Callers can sample while an invocation runs, and local results carry one taken when the adapter answers. Snapshots enforce no limits. Configurations and the adapter contract are unchanged.
Details
runtime_resource_snapshot(plan, runtime)in Rust andawait runtime.resource_snapshot()in Python.RunResult.resource_snapshot. Core reads it under the host lock, so a later invocation can't contribute. A failed read leaves it unset without failing the invocation./procand macOS process APIs, with PID-reuse checks and no new dependency. An unreadable live descendant makes the whole snapshot unavailable instead of undercounting it.ResourceObservationUnavailablewhen the runtime stopped or its host exited, andResourceObservationUnsupportedon Windows, forhttpandnative_pluginadapters, and for non-local providers. Python raises matching error classes.Compatibility: JSON and Python changes are additive. Rust callers need
resource_snapshot: NoneinRunResultliterals and new arms in exhaustiveFabricErrorandSchemaNamematches.Validation
just test-ruston macOS: 251 passed. Focused tests cover snapshots mid-invocation and after stop, host exit and timeout, PID reuse and hidden processes.just no_uv=true test-python: 2,235 passed, 113 skipped, 8 failed. All 8 appear in this machine's recordedmainbaseline lists: a Relay unit test and Claude Code and Codex end-to-end tests that need a working Relay gateway.Where should the reviewer start?
Start with
read_tree_withincrates/fabric-core/src/resource_snapshot.rs, then the final-snapshot read inruntime.rs.Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)
Closes [Enhancement]: Expose per-runtime resource statistics #267
I confirm this contribution is my own work, or I have the right to submit it under this project's license.
I searched existing issues and open pull requests, and this does not duplicate existing work.