Add Solr plugin

[jrxFive]

Seeing if anyone has the need or creating a solr plugin? I have it somewhat completed but have not figured out a good way to collect data from the following endpoint:

/solr/{CORE_NAME}/admin/mbeans?stats=true&wt=json

[sparrc]

why not just use the httpjson plugin? https://github.com/influxdb/telegraf/tree/master/plugins/httpjson

[jrxFive]

I wouldn't know the coreName value beforehand unless I used some type of config management/service discovery/scripting tool to generate a template for the httpjson plugin requests.

[sparrc]

So the plugin would need to discover CORE_NAME?

[jrxFive]

Yea it would use a different endpoint to extract all the cores ( plus some general information ), and then iterate over each CORE_NAME to get the mbean stats. At least I think thats how it would work, I have not found a more dump worthy endpoint to get all the information at once.

/solr/admin/cores?action=STATUS&wt=json