We currently use Kibana 3 and would like to explore the possibilities to write customized panels to cater our usecase (say like histogram using values or stacked bar chart).
Are there any documents/guides available targetting this topic?
There are no docs from Elastic, but there are many community resources if you Google. Also, in Kibana 3, the process is quite simple -- go to [kibana_dir]/app/panels, copy one of the folders representing one of the built-in panels, and use it as a template.
As Mark mentioned, from the support perspective Kibana 3 is now deprecated and you may want to consider basing your deployment on Kibana 4. Kibana 4 extensibility goes way beyond custom panels, as it has a true plugin interface.
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