fix(sp): carry Savings Plan region and instance family into table, CSV and audit

[cristim]

Closes #2178

Root cause

cloud-commitments-go parses SavingsPlansDetails.Region / InstanceFamily into Recommendation.Details (SavingsPlanDetails) only and leaves Recommendation.Region empty on purpose (it exposes awsprovider.EffectiveRegion for filtering). The terminal table (pkg/reporter), the audit record (NewAuditRecord) and the CSV Region column all read rec.Region; the CSV Family column (extractRDSFamily) was RDS-only.

Fix (CLI only, no library change)

• stampSavingsPlanRegions (cmd/multi_service_helpers.go) copies EffectiveRegion into rec.Region right after the fetch. Account-level plans (Compute, SageMaker, Database) stay empty. This one assignment feeds the table, CSV and audit.
• extractRDSFamily returns SavingsPlanDetails.InstanceFamily for SP rows (CSV Family).
• Hourly commitment: the CSV already has a HourlyCommitment column (plus InstanceFamily, DetailsRegion, PlanType) from detailCells, so no new column. Adding it to the terminal table or the audit JSON needs a schema change in the library's reporter/AuditRecord; not done here to avoid widening the table and changing the audit schema. Can follow up if wanted.
• TestRecommendationCompletenessCommand pinned Region == "" for SP rows (the bug); it now expects the row's DetailsRegion.

Evidence

New tests: TestFetchRecommendationsForRegion_SavingsPlanRowsCarryDetailsRegion, TestWriteCSV_SavingsPlanRowHasRegionFamilyAndHourlyCommitment. Before the source change: both FAIL (expected "eu-west-2" actual "", expected "m5" actual ""). After: PASS; full go test ./... passes, go vet clean (make lint cannot run locally: toolchain mismatch).

Real data (dry run only) with #2176 merged locally for the fetch: see the comment below / verification run on a combined build. CSV rows show Region=eu-west-2/eu-central-2, Family=m5/m5a, HourlyCommitment 2.697/0.491/0.28; audit region populated.

Depends on nothing; independent of #2176 in code (the real-data run needs both).

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • CSV exports now include the region for EC2 Instance Savings Plans; account-level Compute Savings Plans remain regionless.
  • The Family column now shows the instance family for Savings Plan details and the RDS family prefix for RDS recommendations. It remains blank for other services.

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Reviewing files that changed from the base of the PR and between 90fd493 and 6a15b42.

📒 Files selected for processing (1)

• cmd/savings_plan_region_test.go

📝 Walkthrough

Fetched EC2 Instance Savings Plan recommendations now receive an effective region when their region is empty. CSV output uses the Savings Plan instance family for the Family column.

Changes: Savings Plan CSV output

Layer / File(s)	Summary
Populate Savings Plan recommendation regions cmd/multi_service_helpers.go, cmd/savings_plan_region_test.go	After fetching recommendations, the code stamps the effective region onto Savings Plan recommendations with an empty region. Tests check EC2 Instance and account-level Compute plan regions.
Write Savings Plan region and family to CSV cmd/multi_service_csv.go, cmd/multi_service_csv_test.go, cmd/recommendation_completeness_test.go, cmd/savings_plan_region_test.go	The CSV Family field uses the Savings Plan instance family. Tests check CSV region, family, and hourly commitment values, and completeness expectations include region details.

Priority: ⬇️ Low

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

Change: Bug fix · Severity of issue fixed: Low

Merge Risk: 🟡 Moderate · up to 90fd4

The pre-commit check is blocked. Replace or narrowly allowlist the fixture and rerun the check before merging.

Pre-merge checks · 4 · 1

Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the main change: carrying Savings Plan region and instance family into the table, CSV, and audit output.
Linked Issues check		Issue #2178 requires a CLI-only fix for Savings Plan Region and Family values. fetchRecommendationsForRegion now calls stampSavingsPlanRegions after the fetch. That function copies `awsprovider.Ef…
Out of Scope Changes check		The changed production code is limited to Savings Plan region stamping and CSV family extraction. The test changes verify the linked behavior and update the completeness expectation for the new Region…

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Actionable comments posted: 1

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Inline comments:
Review comments at @cmd/savings_plan_region_test.go:
- Line 19: Update the account fixture in the savings-plan test to use a
scan-safe value; if the account-shaped value is required, add only a narrowly
scoped allowlist entry for this fixture. Preserve the other test fields and
behavior.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0a28aa4 and 90fd493.

📒 Files selected for processing (5)

• cmd/multi_service_csv.go
• cmd/multi_service_csv_test.go
• cmd/multi_service_helpers.go
• cmd/recommendation_completeness_test.go
• cmd/savings_plan_region_test.go

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[cristim]

Independent review (claude-opus-5-5) of 6a15b42: APPROVE

Root cause, checked against the pinned library

providers/aws@v0.0.0-20261012195142-218912bb8cb9:

• recommendations/parser_sp.go:236-259 builds the SP Recommendation with no top-level Region; region and instance family go only into SavingsPlanDetails{InstanceFamily, Region} (lines 255-256).
• service_client.go:156-164 EffectiveRegion returns rec.Region if set, else SavingsPlanDetails.Region, else "".

The CLI printed rec.Region (table, multi_service_csv.go:257, audit log), so the claimed root cause holds. fetchRecommendationsForRegion is the only GetRecommendations call site in the repo, so stamping there covers every fetch path.

Checks on the specific claims

• No re-filter after the stamp: shouldIncludeRecommendationRegion (multi_service_filters.go:127-131) already used EffectiveRegion, which returns the stamped value unchanged; multi_service_filters.go:59 skips SP. IsRegionAgnostic keys on plan type, not rec.Region.
• Compute SP region stays empty: EffectiveRegion returns "" when Details.Region is empty. Shown by the unit test and the completeness test (fixture). No live Compute recommendations exist for this account.
• SP purchase ignores rec.Region: clientRegionFor (savings_plan_purchase.go:63-69) returns spAPIRegion for SP services, and purchaseRegionLabel (:80-86) reads Details.Region. The CSV re-import path (runCSVPurchases) now groups SP rows by their real region, but its client region goes through the same clientRegionFor, so nothing changes there except the "Region:" log line.
• RI rows: the stamp only applies when CommitmentType == CommitmentSavingsPlan, and extractFamily keeps the RDS branch as it was (TestExtractRDSFamily passes).

Verification (local, this Mac)

• go vet ./... clean. go test ./... at head: 1353 passed. At head merged with current origin/main (d4010ba, fix(sp): fetch only the Savings Plan types requested by --include/--exclude-sp-types #2183; fix(sp): stop filtering Savings Plan recommendations on the endpoint region #2182 is already the PR base): git merge-tree reports no conflicts, ./cmd 1361 passed.
• bash scripts/test-git-secrets-allowlist.sh: 44 PASS, 0 FAIL.
• Fail-before (fixtures): with the tests kept and cmd/multi_service_csv.go + cmd/multi_service_helpers.go reverted to base 0a28aa4:
  • TestFetchRecommendationsForRegion_SavingsPlanRowsCarryDetailsRegion: expected "eu-west-2", actual ""
  • TestWriteCSV_SavingsPlanRowHasRegionFamilyAndHourlyCommitment: expected "m5", actual ""
  • TestRecommendationCompletenessCommand: CSV Region expected "us-east-1", actual "" (all SP subcases)
• Mutation (fixtures): stamping spAPIRegion instead of EffectiveRegion, and returning sp.PlanType instead of sp.InstanceFamily. The unit test got "us-east-1" where it expected "eu-west-2", the CSV test got "EC2Instance" where it expected "m5", and the completeness test's Compute subcase got "us-east-1" where it expected "".
• Real dry run, account . Binary built from the head merged with main, no --purchase, run --services savingsplans --include-sp-types EC2Instance --term 1 --payment no-upfront --rec-lookback-period 30d --coverage 100. Cost Explorer returned eu-west-2 m5 2.697 / $226.84, eu-central-2 m5 0.491 / $77.77, eu-west-2 m5a 0.280 / $37.77.
  • Table Region: eu-central-2 ($77.77), eu-west-2 ($37.77), eu-west-2 ($226.84)
  • CSV (Region, Family, HourlyCommitment, EstimatedSavings): eu-central-2,m5,0.491,77.77 / eu-west-2,m5a,0.28,37.77 / eu-west-2,m5,2.697,226.84
  • Audit log region: eu-central-2, eu-west-2, eu-west-2. Commitment IDs carry the same regions. The audit schema has no family field, so family only shows up in the CSV.
  • Baseline: the same command on origin/main printed an empty Region in the table, and empty Region and Family in all three CSV rows.

Non-blocking findings

1. cmd/savings_plan_region_test.go:16-18,24: the split literal "1234" + "56789012". My call is non-blocking. It does not hide a secret, because the value is the repo's standard synthetic placeholder. The convention in this repo is different, though: .gitallowed (the "Synthetic 12-digit account-ID fixtures" block) adds path-anchored, whole-line entries for synthetic IDs in Go tests. Split literals appear only in scripts/test-git-secrets-allowlist.sh, and only for positive scanner fixtures. A split literal also teaches a pattern that would get a real ID past the scanner. Better than either option: drop the field. Deletion probe: with the Account: line and the testAccountID constant removed, all four affected tests still pass (66 passed), because the tests never read the account. Suggested follow-up: remove both lines. If an account is needed later, add an anchored .gitallowed entry.
2. cmd/multi_service_helpers.go:590: && recs[i].Region == "" is redundant, because EffectiveRegion already returns rec.Region when it is set. Deletion probe: removing it changes no test result. It is harmless and readable, so cleaning it up is optional.
3. cmd/multi_service_csv_test.go:444: the test is still called TestExtractRDSFamily after the rename and has no SP case. The SP branch is covered only through the CSV writer test. Suggest renaming it and adding one SP row to the table.
4. cmd/multi_service_csv.go:353-356: the doc comment says "family-NU bucket", which only applies to RDS. Minor wording.
5. Out of scope: the table's Type column is still blank for SP rows, so the family appears only in the CSV. Fine for fix(sp): Savings Plan rows lose Region and instance family in table, CSV and audit #2178 as filed.

CI on 6a15b42 is green; mergeStateStatus is CLEAN.