fix(http-invocation): remove account ID from request latency metric

[borao]

TL;DR

Remove the nca_id label from function_request_latency while retaining function_id and function_version_id.

This reduces histogram series cardinality without changing request handling.

Additional Details

This change:

• removes nca_id from the record_invocation_end metric API and histogram labels
• updates the invocation response call site
• adds a regression test confirming that the function and function-version labels remain while nca_id is omitted

Rollout order: deploy the autoscaler query change in #769 before deploying this change. The updated autoscaler query supports both the current and new metric label schemas.

For the Reviewer

Please focus on the emitted function_request_latency label set and the rollout relationship with #769.

For QA

Automated validation completed:

• cargo test --package nvcf-invocation-service --lib
• 76 tests passed
• 4 Docker-dependent tests ignored

Checklist

• I am familiar with the Contributing Guidelines.
• I have signed off my commits for Developer Certificate of Origin (DCO) compliance.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

Summary by CodeRabbit

• Bug Fixes
  • Updated invocation latency metrics to report function and version details without including internal execution identifiers.
  • Improved metric consistency for streaming invocation responses.

[coderabbitai]

📝 Walkthrough

Walkthrough

The invocation latency metric no longer includes the nca_id label. The metric API, streaming response call site, and test now use function and function-version labels only.

Changes

Invocation latency metrics

Layer / File(s)	Summary
Metric label contract src/invocation-plane-services/http-invocation/crates/server/src/metrics/mod.rs	record_invocation_end removes the nca_id parameter and label. A test verifies the remaining function and version labels.
Streaming response integration src/invocation-plane-services/http-invocation/crates/server/src/routes/post_pexec.rs	The streaming response path calls record_invocation_end without nca_id.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• NVIDIA/nvcf#769: Removes nca_id from related invocation latency metric handling and aggregation.

Suggested reviewers: along-2017

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title follows Conventional Commits format and accurately describes the removal of the account ID from the request latency metric.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/http-invocation/remove-metric-label

---

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[github-actions]

🛡️ CodeQL Analysis

🚨 Found 2 issue(s)

Severity Breakdown:

• 🔴 Errors: 0
• 🟡 Warnings: 0
• 🔵 Notes: 0

📋 Top Issues

🔗 View full details in Security tab

_{🕐 Last updated: 2026-08-11 18:15:52 UTC | Commit: 7dff4a8}

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In
`@src/invocation-plane-services/http-invocation/crates/server/src/metrics/mod.rs`:
- Around line 379-386: Update the assertions for the metric key in the relevant
test to verify the complete label set: assert that exactly two labels exist and
that they are function_id and function_version_id with the expected values.
Remove the separate absence-only check for nca_id, while preserving the existing
expected label values.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 3425c7b6-64a5-447e-aa82-e842cca4bb37

📥 Commits

Reviewing files that changed from the base of the PR and between 60bdfd1 and 7dff4a8.

📒 Files selected for processing (2)

• src/invocation-plane-services/http-invocation/crates/server/src/metrics/mod.rs
• src/invocation-plane-services/http-invocation/crates/server/src/routes/post_pexec.rs

💤 Files with no reviewable changes (1)

• src/invocation-plane-services/http-invocation/crates/server/src/routes/post_pexec.rs

[balajinvda]

👍

[balajinvda]

🎉 This PR is included in version nvcf-invocation-service-v0.10.1 🎉

The release is available on GitHub release

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