Provide A "Connect Null Values" Option In State Timeline Visualization

[lux4rd0]

What would you like to be added:

I would like to see an option added that allows for connecting null values as "Never, Always, Threshold" similar to how the Time series visualization works.

Why is this needed:

When dealing with event-based data sources like Grafana Loki, there can be gaps between states since there's potentially no "polling" being done by the collector to refresh a state within the $__interval Group By. In this example of viewing "Device On" or "Device Off" states - I want to connect each of the states rather than visible gaps (null values) between events.

Nulls:

Connected:

Another example is where I'm mapping floats to integers for temperatures (one day we'll be able to round up floats to ints! :) )

(Here I've had to do a 6h LogQL interval but it's not accurate)

(Here with a more normal $interval usage in LogQL)

Would like to see this (all values connected mapped to values/colors):

Thanks!

[ryantxu]

Would be nice if we can reuse the same control we have in timeseries:

[github-actions]

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