Table Panel: Add Stat Cell

[codeincarnate]

This PR adds a stat cell to the table panel. This is useful as many users want to display prominent statistics on tables for a variety of use cases including ops monitoring (think CPU, Load, etc), finance (dollars, trends and more), science (monitor values), and more besides.

Currently not really working but added here to track progress.

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[torkelo]

not 100% I see the point here. It's not like it can be much more prominent?

[codeincarnate]

@torkelo it's from a customer request, in particular it's a potential solution to show trend indicators in the table which the stat panel already does. It may make more sense to do a trend cell or something like that. I've also seen the image cell used with value mappings to do something similar but I'm not sure it would cover this use case.

What do you think?

[torkelo]

@codeincarnate yea, a trend cell could work but what would the trend be based on? (Same problem for cell)

Or are you thinking this is used like the chart cell (with cell value at are data frames ) ?

[codeincarnate]

@torkelo definitely thinking along the lines of the chart cell where the cell value is itself a data frame. We could add it as another mode for that potentially 😄

[torkelo]

@codeincarnate do you have any doc that describes the feature request? Is the scenario for time series shown in table?

Is to show a trend number a long a chart cell?

Chart cell I think support diff, if not maybe we can add a trend reducer (value option)

[codeincarnate]

@torkelo bringing together these right now in a design doc

And yep, it is for the timeseries in the table. In terms of trend it would be either show a trend number, direction, or potentially percentage. Trend reducer seems like a really good route!

Given the above I'll close this one for now and reference this conversation in the design doc.