Problem

#7022 added Fusion GPU metrics collection: the gpu block from .fusion/trace.json is parsed on task completion, carried as a transient gpuMetrics field on TraceRecord, and included in the per-task payload sent to Seqera Platform. This works — per-task GPU metrics show correctly in the task details view.

However, the workflow-level metrics summary never includes GPU data. The per-process box-and-whisker stats sent at workflow completion are computed by ResourcesAggregator → ReportSummary, whose mapper table contains only nine series (cpu, mem, vmem, time, reads, writes, cpuUsage, memUsage, timeUsage). GPU was never added there.

The visible effect in Seqera Platform: a GPU run shows GPU metrics in Task details → Metrics, but the run-level Metrics tab shows only CPU/memory plots. The platform already has the schema, API, and frontend charts for the workflow-level GPU series (gpuUsage, gpuMemPeak, gpuMemAvg) — the data just never arrives.

Change

Add three GPU series mappers to ReportSummary, reading the transient gpuMetrics map attached by #7022 (snake_case keys as emitted by Fusion):

The series names match the fields expected by Seqera Platform's WorkflowMetrics model, so no platform change is required — the new series flow automatically through ResourcesAggregator.computeSummaryList() into the workflow completion request.

Behaviour notes

• Tasks without GPU data return null from the mappers and are skipped, same as the existing memUsage/timeUsage series when requests are missing.
• Runs with no GPU tasks produce no GPU series at all (Summary.compute() returns null on empty series), so existing behaviour is unchanged for non-GPU workloads.
• The HTML execution report is unaffected: ReportTemplate.js reads specific named keys from the summary JSON and ignores unknown ones.

Tests

• should get gpu summary stats — quartiles/mean/labels computed across GPU tasks, with a CPU-only task correctly excluded from the GPU series.
• should return null gpu summary when no task reports gpu metrics — no GPU series for non-GPU runs.

Verified locally: ReportSummaryTest, ResourcesAggregatorTest, ReportObserverTest, and nf-tower TowerObserverTest all pass.

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