Get stale flags chart data
Get stale flags chart data. Engineering insights displays stale flags data in the [flag health metric view](https://launchdarkly.com/docs/home/observability/flag-health).
### Expanding the chart response
LaunchDarkly supports expanding the chart response to include additional fields.
To expand the response, append the `expand` query parameter and include the following:
* `metrics` includes details on the metrics related to stale flags
For example, use `?expand=metrics` to include the `metrics` field in the response. By default, this field is **not** included in the response.
Authentication
Authorizationstring
API Key authentication via header
Query parameters
projectKey
The project key
environmentKey
The environment key
applicationKey
Comma separated list of application keys
groupBy
Property to group results by. Options: maintainer
maintainerId
Comma-separated list of individual maintainers to filter results.
maintainerTeamKey
Comma-separated list of team maintainer keys to filter results.
expand
Options: metrics
Response
Chart response
metadata
Metadata for the chart
series
Series data for the chart