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Cost Trends

The Cost Trends page at /finops/trends is the historical chart explorer — month-over-month, year-over-year, with forecasting. Use it for monthly business reviews and FinOps reports.

Charts​

  • Cost over time — daily or weekly line chart, last 12 months
  • MoM / YoY comparison — overlay current period over prior with delta % per day
  • Forecast — linear / seasonal projection for next 30 / 60 / 90 days, with confidence band

Decomposition​

The page can decompose the trend by:

  • SKU (storage / compute / DLT / serverless)
  • Catalog
  • Team / owner
  • Cluster / warehouse

Pick one decomposition and the chart switches to a stacked area showing each contributor.

Anomaly markers​

Cost anomalies (sudden spikes / dips) are flagged on the chart. Hover for:

  • Date
  • Magnitude (% deviation from trend)
  • Suspected driver (the largest changed dimension)

Anomalies promote to Incidents automatically when severity exceeds a configurable threshold.

Forecasting​

Two methods, switchable via the Method toggle:

  • Linear — simple OLS on recent N days
  • Seasonal — weekly seasonality baked in (matches business workloads with weekday peaks)

Forecast confidence widens with horizon. Use this primarily for short-term budgeting, not long-term planning.

Compare scenarios​

The Scenario mode lets you toggle "if I applied recommendation X" and see how the forecast curve changes. Useful for justifying optimisation work.

Export​

CSV / JSON / PNG, plus shareable URL preserving filters and decomposition.

API​

GET /finops/trends?metric=cost&decompose=team&days=365
GET /finops/trends/forecast?method=seasonal&horizon_days=60
GET /finops/trends/anomalies?severity=high