Add basic other bucketing to grouped line chart - round 2

[cwbuecheler]

Adds basic "other" bucketing on the x-axis, the same as on the bar chart, grouped bar chart, line chart, etc, to the grouped line chart.

This doesn't try to reinvent the wheel. It just does what the current charts do, for a new chart.

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Add x-axis "Other" bucketing to the grouped line chart

Extends the existing xAxisMaxItems/"Other" bucketing behavior (already available on the standard bar and line charts) to LineChartGroupedPro, which previously had no x-axis limiting at all — it rendered one point per distinct x-axis value with no cap.

• Added groupTailAsOtherPerGroup() (charts.utils.ts) — a grouped-chart-aware version of the existing groupTailAsOther(). Since grouped-chart data has one row per (x-axis value, group) pair rather than one row per x-axis value, it ranks distinct axis values, keeps the head, and aggregates the tail into one synthetic "Other" row per group so every line stays continuous. Extracted the shared sum/avg/min/max aggregation logic into a small aggregateMeasureValues helper, reused by both functions.
• Wired a new xAxisMaxItems config input through LineChartGroupedPro's definition.ts → index.tsx → LineChartGroupedPro.utils.ts, reusing the input already defined for the other charts.
• getLineChartGroupedProData now pins the "Other" label to the end of the sorted x-axis labels, rather than letting it sort alphabetically wherever it happens to land.
• No new data queries required — this is purely client-side post-processing on data already returned by the existing query, same cost profile as the standard chart's version.

SonarCloud fixes

• typescript:S2871 — replaced a bare .sort() in LineChartGroupedPro.utils.ts with an explicit comparator that reproduces JS's default string-coercion sort (display order unchanged).
• typescript:S1788 — removed default parameter values (= []) that preceded required parameters in groupTailAsOther/groupTailAsOtherPerGroup, handling the nullish case internally instead so no call sites needed to change.

Tests

Added coverage in charts.utils.test.ts for groupTailAsOtherPerGroup (bucketing by distinct axis count rather than row count, per-group "Other" rows, aggType handling, empty-data default) and in LineChartGroupedPro.utils.test.ts for getLineChartGroupedProData (maxItems wiring, alphabetical sort, "Other" pinned last, per-group "Other" values).

Known limitation (not fixed here)

Like the existing bar/line-default bucketing, this operates on data already capped by the generic maxResults query limit, and the underlying query has no orderBy, so the "top N" kept isn't guaranteed to be sorted by value. Out of scope for this PR — flagged for the broader bucketing revamp.

Summary by CodeRabbit

• New Features

  • Added an optional limit for x-axis items in grouped line charts.
  • Excess x-axis values are grouped into an “Other” category for each series.
  • “Other” values are aggregated according to the selected measure, with labels sorted consistently and “Other” shown last.

• Bug Fixes

  • Improved handling of empty or undefined chart data.
  • Preserved correct per-group values when applying x-axis limits.

[coderabbitai]

Walkthrough

The pull request adds per-group tail bucketing for grouped charts. It introduces xAxisMaxItems, aggregates overflow measures into group-specific “Other” rows, sorts axis labels explicitly, and adds utility and chart transformation tests.

Changes

Grouped axis bucketing

Layer / File(s)	Summary
Per-group bucketing utility src/components/charts/charts.utils.ts, src/components/charts/charts.utils.test.ts	The utilities aggregate measure values by aggregation type and add groupTailAsOtherPerGroup. Tests cover limits, missing values, averages, unchanged data, and undefined data.
Grouped line chart data transformation src/components/charts/lines/LineChartGroupedPro/LineChartGroupedPro.utils.ts, src/components/charts/lines/LineChartGroupedPro/LineChartGroupedPro.utils.test.ts	The chart utility applies per-group bucketing, sorts axis labels with string comparison, and places “Other” last. Tests cover parameter forwarding and per-group results.
Axis limit input wiring src/components/charts/lines/LineChartGroupedPro/definition.ts, src/components/charts/lines/LineChartGroupedPro/index.tsx	The component registers xAxisMaxItems, adds it to its props, and passes it to getLineChartGroupedProData.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant LineChartGroupedPro
  participant getLineChartGroupedProData
  participant groupTailAsOtherPerGroup
  LineChartGroupedPro->>getLineChartGroupedProData: pass xAxisMaxItems as maxItems
  getLineChartGroupedProData->>groupTailAsOtherPerGroup: bucket grouped chart data
  groupTailAsOtherPerGroup-->>getLineChartGroupedProData: return head rows and Other rows
  getLineChartGroupedProData-->>LineChartGroupedPro: return sorted chart data and axis

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Suggested reviewers: mad-raccoon

Merge Risk: 🟡 Moderate · up to 362aa

Charts with a real “Other” category can silently omit aggregated values from the displayed line. Resolve the collision before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: adding "Other" bucketing to the grouped line chart. "Round 2" adds minor context without making the title unclear.
Description check	✅ Passed	The description includes the reason for the change, detailed implementation changes, test evidence, and a known limitation. It satisfies the repository template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 6…
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 grouped-line-other-bucketing

Warning

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🔧 ESLint

If the error stems from missing dependencies, add them to the package.json file. For unrecoverable errors (e.g., due to private dependencies), disable the tool in the CodeRabbit configuration.

src/components/charts/charts.utils.test.ts

ESLint skipped: missing config or dependency (missing-dependency). The ESLint configuration references a package that is not available in the sandbox.

src/components/charts/charts.utils.ts

ESLint skipped: the matched ESLint configuration already failed (missing-dependency).

src/components/charts/lines/LineChartGroupedPro/LineChartGroupedPro.utils.test.ts

ESLint skipped: the matched ESLint configuration already failed (missing-dependency).

• 3 others

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
95.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@src/components/charts/charts.utils.ts`:
- Around line 88-90: Update groupTailAsOtherPerGroup and the
getLineChartGroupedProData flow so the synthetic “other” bucket has a distinct
internal identity from any retained native axis value, while still rendering the
translated common.other label. Add a regression test covering a native “Other”
axis value and verify both native and aggregated rows are preserved.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between f17e2a8 and 362aa9a.

📒 Files selected for processing (6)

• src/components/charts/charts.utils.test.ts
• src/components/charts/charts.utils.ts
• src/components/charts/lines/LineChartGroupedPro/LineChartGroupedPro.utils.test.ts
• src/components/charts/lines/LineChartGroupedPro/LineChartGroupedPro.utils.ts
• src/components/charts/lines/LineChartGroupedPro/definition.ts
• src/components/charts/lines/LineChartGroupedPro/index.tsx

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[cwbuecheler]

@mad-raccoon - This one's much simpler. It's just adding x-axis bucketing (done in exactly the same way as it is done on the bar charts) to the grouped line chart. Here's an example of it working: