> For a complete page index, fetch https://docs.conduit.xyz/llms.txt

## CU usage by API key breakdown chart

Added a new CU Usage by API Key breakdown chart to the Nodes Metrics page.

## What's new

### CU Usage by API Key Breakdown Chart

A new chart on the Nodes Metrics page showing compute unit usage broken down by API keys over time.

* **Per-API Key CU usage** -- Visualizes compute unit consumption across all API keys as a stacked area chart over your selected time range
* **Zero-usage normalization** -- API keys with no usage on a given day are explicitly represented as `0`, so the chart accurately shows when usage drops to zero rather than hiding gaps
* **Filtered tooltips** -- Hovering over a time interval only shows API keys with actual usage, keeping the tooltip clean. A **Total** row at the bottom sums all visible API keys
* **API Key filter** -- Use the **API Key** dropdown to filter the chart to specific API keys, with the total CU count updating to reflect the filtered selection