showing default tooltip on mark

[amsiglan]

Description

Show custom tooltip for point in time annotation mark in vega visualization

Issues Resolved

Solves remaining part of #3317

Screenshot

Testing the changes

N/A

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
  • yarn test:ftr
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[ohltyler]

LGTM. Within the tooltip handler, we can process the item which will have the annotation type info. In this way, we can process any items that have this particular annotation type and render a custom value based on that (in our case, an aggregate breakdown of events by plugin resource type).

Current screenshot shows the default tooltip value, which is the x-axis value. This makes sense, since the event marks by default don't have encodings on the y-axis. This is the value we can override.

[ohltyler]

I have a working follow up to show the values as expected. Currently in this commit: a38cc31

After this is merged will open a small PR to add this.