Use Time Series chart instead of area chart in panel_types
Panel types is used to build our dynamic dashboard
Panel types is currently hidden behind the feature flag
The following discussion from !31639 (merged) should be addressed:
One final thought, I think we recently added
panel_types(maybe behind a feature flag). We should probably create a follow-up merge request to add line chart in as a panel type so we can properly allow users to select it as an option.
Relates to issue https://gitlab.com/gitlab-org/gitlab-ce/issues/65412