Plugin to monitor Solr server usage. Support of multicore configuration with automatic core names gathering.
Available graphs: Average requests per second Average time per request Number of errors Number of timeouts Total number of requests Number of documents
Written in Python / platform independant. Tested on Solr version 1.4.0, working on Debian Lenny with with default installation (no alternative packet needed).
Don't know why it currently only has a rating of 1 star, but you ought to try it out first before making any judgements. You should also take the time to browse around the other plugins in the Munin Exchange. Pretty neat place.
To read the full post, follow the Reference Box link.