"Hide All"/"Show All" button to toggle multiple metric visibility on the client side

[SunilChiluvuri]

This is a request for an enhancement.

When there are a large number of metrics(>25) in a single graph, It would be very convenient to have a way to hide all of them with one click.
It will make the number of clicks required to compare 3-4 metrics from the large set more manageable.

[rrada]

I think it's the same as #350 . It's in master branch already.

[torkelo]

@SunilChiluvuri yes, this is in master. And will be in next release (next week)