Add Tooltip to Timeline Chart

[Rperry2174]

We currently use the Flot library for our timeline. We'd like to add a tooltip that moves horizontally along the X axis and tells you what timestamp is currently being hovered:

This is an example taken from ApexCharts, but we'd like to recreate this (tooltip only) in Flot library

Here is link to Flot tooltip plugin

The biggest goal is to just be able to better understand what is being hovered. I'm open to other "styles" of tooltip it just has to exist in some way that lets you know what particular time you are hovering over

[shaleynikov]

Hey, got deeper into how timeline is rendered and here is my findings:

Flot tooltip plugin has a lot of logic built in. Using it for this purpose will require either:

1. Tooltip "target" to be hoverable (which isn't possible now as currently data chunks are displayed as "vertical lines" and not, for instance, bars) (https://github.com/krzysu/flot.tooltip/blob/master/js/jquery.flot.tooltip.js#L177)
2. Certain draw options to be enabled (https://github.com/krzysu/flot.tooltip/blob/master/js/jquery.flot.tooltip.js#L179)

For now I don't see an easy way to achieve required functionality with current tooltip plugin.

I would suggest to create a new plugin relying on Flot plugin system (https://github.com/flot/flot/blob/master/docs/PLUGINS.md) rather than re-using existing flot-plugin

[Rperry2174]

Yeah I suspected this might be the better path too so if you think that would work better / be cleaner than definitely happy to go that route @shaleynikov

cc @eh-am