# Incident Blast Radius (Network example)

> WestCoast Charts 1.1.5, release, public Core release, on npm. HTML: https://westcoast-charts.com/gallery/network/facet-incident/ · Index for agents: https://westcoast-charts.com/llms.txt

Facet layout: a global control plane in the centre, six regions as facets, clusters and services on the outer shells. The dashed path traces how a cache eviction in Frankfurt travelled to billing in Virginia.

## Question

How did one incident travel across regions and services?

## How to read it

- Facets: Each coloured face belongs to a region.
- Levels: Control plane, regions, clusters and services extend from centre to outer shell.
- Dashed path: The explicit incident path connects the affected services across regions.

Try: Follow authz-cache in Frankfurt through session-api and checkout to billing-ledger in Virginia. Select a node for its relationships and incident context.

- Chart composition: see the embedded example (interactive charts)
- Collection: Network · Network
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/premium/network/facet-incident.html

## Setup

```js
import WestCoastCharts from 'west-coast-charts'
import types from 'west-coast-charts/types'
import premium from 'west-coast-charts/premium'
import networkFacet from 'west-coast-charts/layers/network-facet'

WestCoastCharts.use(types).use(premium).use(networkFacet)
const WestCoastChartsPremium = premium
const WestCoastChartsLayer_networkFacet = networkFacet
WestCoastCharts.setLicenseKey(LICENCE_KEY) // paid production licence; localhost evaluation needs no key
```

## Options

This example builds its charts with page controls and helpers, so there is no single options object. Read the standalone example for the source.

## Verify

- Text check (Library 1.1.5): load `west-coast-charts/agent/describe` and call `chart.describe({ format: "json" })` for the actual drawn state. The live reader is on this example’s HTML page.
- Command line (Public agent tools 0.2.3, tested with Library 1.1.5; available from the versioned GitHub release and npm, https://westcoast-charts.com/docs/cli/index.md): `wcc chart export network-facet-incident.json --out network-facet-incident.svg --with-table` (save the options above as JSON first)