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feat(metrics): measure terraform subprocess resource usage - #3104
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Erik Osterman (Cloud Posse) (osterman) merged 11 commits intoSep 16, 2026
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…aries Command-execution resource metrics (CPU, memory, etc.) previously measured only the atmos process's own RUSAGE_SELF, excluding terraform and every other subprocess Atmos spawns. Collect subprocess-tree usage from os/exec.Cmd.ProcessState (children-inclusive) at the shared execution funnel instead, combine it with atmos's own usage for the Pro exec-metadata upload, and add two new local ui.Info summaries: one after terraform plan/apply/deploy, and one aggregate at the end of the whole atmos invocation. Both are gated by a new settings.metrics.enabled toggle (default on). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Announce the terraform subprocess resource-usage metrics feature and link it into the CI/CD Simplification roadmap initiative. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Important Cloud Posse Engineering Team Review RequiredThis pull request modifies files that require Cloud Posse's review. Please be patient, and a core maintainer will review your changes. To expedite this process, reach out to us on Slack in the |
Dependency Review✅ No vulnerabilities or license issues found.Scanned FilesNone |
Resource Changes Found for
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CI acceptance tests broke on three counts from the subprocess resource
metrics feature:
- The new local "Completed in ..."/"Total in ..." ui.Info lines leaked
into exact-match golden stderr snapshots; wall time/CPU/memory can
never be part of a stable snapshot, so strip the whole line during
comparison, matching the existing pattern used for other
environment-dependent log lines.
- describe config's JSON output gained a "metrics": {} key (the new
settings.metrics section) — regenerated the two affected golden
snapshots via -regenerate-snapshots.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughAtmos now collects resource usage for Atmos and spawned Terraform processes, including child processes. It displays per-command and final summaries, supports ChangesResource metrics
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Atmos
participant Terraform
participant Metrics
participant ExecMetadata
participant NativeCI
Atmos->>Terraform: execute command
Terraform-->>Metrics: return process-tree usage
Atmos->>Metrics: combine Atmos and Terraform usage
Metrics-->>Atmos: display local summaries
Atmos->>ExecMetadata: store combined metrics
ExecMetadata->>NativeCI: render Terraform resource usage
Suggested labels: Suggested reviewers: Merge Risk: 🔵 Low · up to The new metrics feature is broadly mergeable, but a narrow possibility remains that aggregate output could be omitted for wall-time-only subprocess samples. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 52.46% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 61 functions across 23 files. (5 skipped: 5 unsupported.)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@pkg/datafetcher/schema/atmos/config/1.0.json`:
- Around line 2012-2024: Update every schema under the datafetcher schema
directory to define the metrics property and its MetricsSettings reference
consistently with the existing 1.0 schema, including null and yamlFunction
alternatives and the same description; preserve each schema’s surrounding
structure and do not modify unrelated definitions.
In `@pkg/metrics/process/metrics_windows.go`:
- Around line 59-63: The Windows process metrics path currently omits
child-process CPU time because populateSysUsage is a no-op. Implement Windows
Job Object accounting via QueryInformationJobObject and incorporate the
aggregate user/system times into ProcessMetrics, including the metrics.go
aggregation site so subprocess-tree totals include provider-plugin CPU time;
alternatively, explicitly mark Windows CPU metrics as direct-process-only at
both affected sites if job accounting is not supported.
In `@tests/cli_test.go`:
- Line 552: Update resourceMetricsSummaryLogRegex to require the exact ui.Info
prefix and Atmos summary-line format, while preserving matching for both
“Completed” and “Total” variants. Do not allow arbitrary Terraform child-process
lines with the same trailing text to match.
In `@website/docs/cli/configuration/settings/metrics.mdx`:
- Line 61: Update the metrics documentation sentence describing commands without
subprocesses so it states they remain unaffected; describe the final aggregate
summary as covering tracked Terraform/OpenTofu subprocess runs and Atmos usage
associated with those runs.
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cmd/root.gointernal/exec/shell_utils.gointernal/exec/terraform.gointernal/exec/terraform_execute_helpers_exec.gopkg/datafetcher/schema/atmos/config/1.0.jsonpkg/metrics/process/doc.gopkg/metrics/process/metrics.gopkg/metrics/process/metrics_test.gopkg/metrics/process/metrics_unix.gopkg/metrics/process/metrics_windows.gopkg/process/process.gopkg/process/process_test.gopkg/proexec/async.gopkg/proexec/envelope.gopkg/proexec/envelope_test.gopkg/proexec/sync.gopkg/schema/metrics.gopkg/schema/schema.gotests/cli_test.gotests/snapshots/TestCLICommands_atmos_describe_config.stdout.goldentests/snapshots/TestCLICommands_secrets-masking_describe_config.stdout.goldenwebsite/blog/2026-09-10-terraform-resource-usage-metrics.mdxwebsite/docs/cli/configuration/settings/metrics.mdxwebsite/src/data/roadmap.js
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #3104 +/- ##
==========================================
+ Coverage 84.15% 84.19% +0.04%
==========================================
Files 2017 2024 +7
Lines 198652 199629 +977
==========================================
+ Hits 167176 168084 +908
- Misses 23366 23412 +46
- Partials 8110 8133 +23
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- Document that Windows CPU-time metrics are direct-process-only: GetProcessTimes (which Go's ProcessState.UserTime()/SystemTime() call on Windows) reports only the named process, not its descendants, so a Terraform provider plugin's CPU time is not reflected in the Windows numbers the way it is on Unix (wait4(2)'s rusage). Corrects a doc comment that incorrectly claimed cross-platform child-inclusive CPU aggregation. - Anchor the snapshot-sanitization regex for the new resource-usage summary line to ui.Info's literal "▶ " prefix, so it can only match Atmos's own summary line and never coincidentally strip real Terraform console output containing similar text. - Correct settings/metrics.mdx: a command with no subprocess neither shows a per-command line nor triggers the final aggregate summary — the aggregate only appears when at least one subprocess actually ran. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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The intro was a contrived "why did this take 12 minutes" scenario. The actual reason this feature exists is runner sizing: teams provisioning GitHub-hosted tiers or self-hosted pools have no data on what a Terraform run actually costs, so they guess and correct after an OOM kill or a timeout. Also drop the incorrect implication that Atmos Pro runs its own runner fleet — it orchestrates the same GitHub-hosted/self-hosted runners, it doesn't provide its own. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Add a "Resource usage" line (wall time, CPU time, peak memory) to the terraform plan/apply GitHub Actions job summary, reusing the same combined subprocess-tree + Atmos usage numbers and formatting already shown by the local "Completed in ..." display and uploaded to Atmos Pro. This is the most visible place to see what a component actually costs, directly in the GitHub Actions run UI, which is the real motivation for this whole feature: sizing runner tiers and self-hosted pools from real data instead of guessing. - pkg/metrics/process: export FormatDuration/FormatBytes so the CI job-summary templates render identically to the local CLI display. - pkg/ci/plugins/terraform: new TerraformMetricsSummary field on TerraformTemplateContext, populated from the same info.ExecMetadataRawMetrics the exec-metadata upload already reads (internal/exec/terraform_execute_helpers_exec.go) — no new plumbing path needed, same type-assertion pattern as terraform.go's captureExecMetadataSync. - templates/plan.md, templates/apply.md: render the line when metrics are available, omitted entirely otherwise (e.g. no subprocess ran). - Docs and blog post updated to describe the job-summary surface; roadmap milestone description updated to match. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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💥 This pull request now has conflicts. Could you fix it Erik Osterman (Cloud Posse) (@osterman)? 🙏 |
…pu-memory-ui-info # Conflicts: # internal/exec/terraform_execute_helpers_exec.go # pkg/schema/schema.go
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Inline comments:
In `@pkg/metrics/process/metrics.go`:
- Around line 93-94: Update MaxRSSBytes handling in populateSysUsage and its
aggregation through Combine so it does not present Linux Rusage.Maxrss as
process-tree peak memory; either implement aggregate process-tree RSS sampling
over time, or rename the metric and every user-facing reference in
DisplaySummary, Native CI templates, and metrics documentation to
“largest-process RSS” while preserving the measured value.
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cmd/root.gointernal/exec/terraform.gointernal/exec/terraform_execute_helpers_exec.gopkg/ci/plugins/terraform/template_test.gopkg/ci/plugins/terraform/templates/apply.mdpkg/ci/plugins/terraform/templates/plan.mdpkg/datafetcher/schema/atmos/config/1.0.jsonpkg/metrics/process/metrics.gopkg/schema/schema.gotests/cli_test.gotests/snapshots/TestCLICommands_atmos_describe_config.stdout.goldentests/snapshots/TestCLICommands_secrets-masking_describe_config.stdout.goldenwebsite/blog/2026-09-10-terraform-resource-usage-metrics.mdxwebsite/src/data/roadmap.js
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…e peak CodeRabbit correctly flagged that ru_maxrss for a reaped subprocess tree (via wait4(2) on Unix) reports the peak RSS of the single largest process observed, not a simultaneous sum across every concurrently running process. Terraform plus two provider plugins each peaking at 200MB would report ~200MB, not ~600MB — misleading for the runner-sizing use case this feature exists for. - pkg/metrics/process: document the real ru_maxrss semantics on ProcessMetrics.MaxRSSBytes and Combine; relabel the DisplaySummary line "Peak memory (largest process)" instead of bare "Peak memory". - pkg/ci/plugins/terraform: same relabeling in the Native CI job-summary templates and TerraformMetricsSummary's doc comment. - website/docs/.../pro.mdx: the pre-existing "Execution metrics and runner sizing" section still described the old, self-usage-only behavior from #2926 ("these measurements exclude Terraform/OpenTofu and provider subprocesses") — now stale and factually wrong given this PR's whole purpose. Rewritten to describe current behavior plus the largest-process caveat. - website/docs/.../metrics.mdx, blog post: matching wording + an explicit caveat note so the imprecision is documented, not just silently relabeled. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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what
terraform plan/apply/deployfrom the actual subprocess tree (theterraform/tofuprocess and everything it spawns, e.g. provider plugins) instead of only the Atmos CLI wrapper's own negligible usage.ui.Infosummary line after each terraform plan/apply/deploy run, plus one aggregate summary at the end of the wholeatmosinvocation covering every subprocess spawned during the run (e.g. every component in a multi-component--affectedplan).settings.metrics.enabledsetting (defaulttrue); it never affects the Atmos Pro upload.describe affected) are unaffected.why
RUSAGE_SELF, which excludes the terraform subprocess entirely — the actual expensive part of anyplan/apply/deployrun. This restores the subprocess-tree measurement approach from the feature's original design (feat: Subprocess resource metrics collection and Atmos Pro upload #2217, closed unmerged) at the shared execution funnel every component type goes through, so the reported numbers reflect what a run actually cost, both locally and in Atmos Pro.references
Summary by CodeRabbit
New Features
Configuration
settings.metrics.enabled, enabled by default, to control local metric summaries.Documentation