Add ability to scale the y-axis of a histogram against a logarithmic scale

[ukcrpb6]

When a large outliers occur within the histogram it makes the small values within the graph difficult to discern, this is especially true when one or more series contribute.

To smooth these values and provide a readable displayed histogram scaling the graph using a logarithmic function is necessary.

The provided patch applies both configuration with configurable a base and the necessary scaling functions and tick functions to render the data and axis.

[vasily-kirichenko]

I merged this into the elasticsearch/master and the histograms don't show at all. I think it's because of huge changes in master.

I'm very much appreciate this functionality to be available in the elasticsearch/master. Are there any showstoppers to pull this request?

[griffinmyers]

+1

[edwindotcom]

didn't look at the commit - but really need this feature!

[sausagee]

+1

[ukcrpb6]

Have rebased the PR changes upto the current kibana master

https://www.dropbox.com/s/a6vgknjjwg2nq59/Screenshot%202014-05-11%2015.18.53.png

[surfflash]

+1

[rashidkpc]

Thanks for rebasing this, I'd love to get it into master. There's a couple issues currently:

1. The default base is 1, which is always going to be undefined (Infinity)
2. The y-axis formatting is off, values run into each other:

[inthecloud247]

+1 :-)

[dbrgn]

Definitely +1!

[maltekrupa]

+1

[dchichkov]

It'd be nice to get it into master.

[pinepain]

Must-have feature, are there any cons to have this PR merged in master?

[ukcrpb6]

Played around with a few algorithms for computing the tick marks but most resulted in ugly choices.

Have simplified the ticks to just using powers rather than trying to squeeze more ticks in for most ranges of values this produces reasonable choices without cramping the graph.

[adampl]

Could you please show how it copes with fractional or negative numbers?

[stig]

+1 would really like to see this!

[spalger]

Woops! Sorry about that! We recently replaced the master branch with Kibana 4. This action force closed all of the old pull requests against master. We will be reviewing these on a case-by-case basis and creating new tickets as necessary.

The good news is that many long requested features can be found in Kibana 4, and we're being entirely open about our roadmap. Check out the roadmap tickets (which we're still filling in) here.

If you're looking for the old Kibana 3 code you can find it here.