diff --git a/plugins/solr/solr4_ b/plugins/solr/solr4_
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+++ b/plugins/solr/solr4_
@@ -0,0 +1,431 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2013, Antonio Verni, me.verni@gmail.com
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+#
+# Munin plugin for monitoring a multicore solr 4.* installation via mbean.
+# It calls:
+# > http://localhost:8080/solr/admin/cores?action=STATUS&wt=json
+# and
+# > http://localhost:8080/solr/corename/admin/mbeans?stats=true&wt=json
+# for each core to retrieve cores and data. Verify those urls on your instance.
+#
+# Configuration parameters:
+# [solr_*]
+#    host_port <host:port>
+#    qpshandler_<handlerlabel> <handlerpath>
+#    availableram <ramsize in bytes>
+#
+# Example:
+#    host_port solrhost:8080 
+#    qpshandler_select /select
+#    availableram 3221225472
+#
+# Defined checks:
+#    numdocs  
+#    qps  
+#    indexsize  
+#    requesttimes  
+#    documentcache  
+#    fieldvaluecache  
+#    filtercache  
+#    queryresultcache  
+#
+# Installation example:
+#    ln -s /usr/share/munin/plugins/solr_.py /etc/munin/plugins/solr_numdocs_core_1
+#    ln -s /usr/share/munin/plugins/solr_.py /etc/munin/plugins/solr_requesttimes_select
+#    ln -s /usr/share/munin/plugins/solr_.py /etc/munin/plugins/solr_qps_core_1_select
+#
+# Source repo: https://github.com/averni/munin-solr
+
+import sys
+import os
+import httplib
+import json
+
+def parse_params():
+    plugname = os.path.basename(sys.argv[0]).split('_', 2)[1:]
+    params = {
+        'type': plugname[0],
+        'op': 'config' if sys.argv[-1] == 'config' else 'fetch',
+        'core': plugname[1] if len(plugname) > 1 else '',
+        'params': {}
+    }
+    if plugname[0] in[ 'qps', 'requesttimes']:
+        data = params['core'].rsplit('_', 1)
+        handler = data.pop()
+        params['params'] = {
+                'handler': os.environ.get('qpshandler_%s' % handler, '/select')
+        }
+        if not data:
+            params['core'] = ''
+        else:
+            params['core'] = data[0]
+    elif plugname[0] ==  'indexsize':
+        params['params']['core'] = params['core']
+    return params
+
+#############################################################################
+# Datasources
+
+class CheckException(Exception):
+    pass
+
+class JSONReader:
+    @classmethod
+    def readValue(cls, struct, path):
+        if not path[0] in struct:
+            return -1
+        obj = struct[path[0]]
+        if not obj:
+            return -1
+        for k in path[1:]:
+            obj = obj[k]
+        return obj
+
+class SolrCoresAdmin:
+    def __init__(self, host):
+        self.host = host
+        self.data = None
+
+    def fetchcores(self):
+        uri = "/solr/admin/cores?action=STATUS&wt=json"
+        conn = httplib.HTTPConnection(self.host)
+        conn.request("GET", uri)
+        res = conn.getresponse()
+        data = res.read()
+        if res.status != 200:
+            raise CheckException("Cores status fetch failed: %s\n%s" %( str(res.status), res.read()))
+        self.data = json.loads(data)
+
+    def getCores(self):
+        if not self.data:
+            self.fetchcores()
+        cores = JSONReader.readValue(self.data, ['status'])
+        return cores.keys()
+
+    def indexsize(self, core = None):
+        if not self.data:
+            self.fetchcores()
+        if core:
+            return {
+                core: JSONReader.readValue(self.data, ['status', core, 'index', 'sizeInBytes'])
+            }
+        else:
+            ret = {}
+            for core in self.getCores():
+                ret[core] = JSONReader.readValue(self.data, ['status', core, 'index', 'sizeInBytes'])
+            return ret
+
+class SolrCoreMBean:
+    def __init__(self, host, core):
+        self.host = host
+        self.data = None
+        self.core = core
+
+    def _fetch(self):
+        uri = "/solr/%s/admin/mbeans?stats=true&wt=json" % self.core
+        conn = httplib.HTTPConnection(self.host)
+        conn.request("GET", uri)
+        res = conn.getresponse()
+        data = res.read()
+        if res.status != 200:
+            raise CheckException("MBean fetch failed: %s\n%s" %( str(res.status), res.read()))
+        raw_data = json.loads(data)
+        data = {}
+        self.data = {
+            'solr-mbeans': data
+        }
+        key = None
+        for pos, el in enumerate(raw_data['solr-mbeans']):
+            if pos % 2 == 1:
+                data[key] = el
+            else:
+                key = el
+
+    def _read(self, path):
+        if self.data is None:
+            self._fetch()
+        return JSONReader.readValue(self.data, path)
+
+    def _readCache(self, cache):
+        result = {}
+        for key in ['lookups', 'hits', 'inserts', 'evictions', 'hitratio']:
+            path = ['solr-mbeans', 'CACHE', cache, 'stats', 'cumulative_%s' % key]
+            result[key] = self._read(path)
+        result['size'] = self._read(['solr-mbeans', 'CACHE', cache, 'stats', 'size'])
+        return result
+
+    def getCore(self):
+        return self.core
+
+    def qps(self, handler):
+        path = ['solr-mbeans', 'QUERYHANDLER', handler, 'stats', 'avgRequestsPerSecond']
+        return self._read(path)
+
+    def requesttimes(self, handler):
+        times = {}
+        path = ['solr-mbeans', 'QUERYHANDLER', handler, 'stats']
+        for perc in ['avgTimePerRequest', '75thPcRequestTime', '99thPcRequestTime']:
+            times[perc] = self._read(path + [perc])
+        return times
+
+    def numdocs(self):
+        path = ['solr-mbeans', 'CORE', 'searcher', 'stats', 'numDocs']
+        return self._read(path)
+
+    def documentcache(self):
+        return self._readCache('documentCache')
+
+    def filtercache(self):
+        return self._readCache('filterCache')
+
+    def fieldvaluecache(self):
+        return self._readCache('fieldValueCache')
+
+    def queryresultcache(self):
+        return self._readCache('queryResultCache')
+
+#############################################################################
+# Graph Templates
+
+CACHE_GRAPH_TPL = """multigraph solr_{core}_{cacheType}_hit_rates
+graph_category solr
+graph_title Solr {core} {cacheName} Hit rates
+graph_order lookups hits inserts
+graph_scale no
+graph_vlabel Hit Rate
+graph_args -u 100 --rigid
+lookups.label Cache lookups
+lookups.graph no
+lookups.min 0
+lookups.type DERIVE
+inserts.label Cache misses
+inserts.min 0
+inserts.draw STACK
+inserts.cdef inserts,lookups,/,100,*
+inserts.type DERIVE
+hits.label Cache hits
+hits.min 0
+hits.draw AREA
+hits.cdef hits,lookups,/,100,*
+hits.type DERIVE
+
+multigraph solr_{core}_{cacheType}_size
+graph_title Solr {core} {cacheName} Size
+graph_args -l 0
+graph_category solr
+graph_vlabel Size
+size.label Size
+size.draw LINE2
+evictions.label Evictions
+evictions.draw LINE2
+
+"""
+
+QPSMAIN_GRAPH_TPL = """graph_title Solr {core} {handler} Request per second"
+graph_args -l 0
+graph_vlabel request / second
+graph_category solr
+{cores_qps_graphs}"""
+
+QPSCORE_GRAPH_TPL = """qps_{core}.label {core} Request per second
+qps_{core}.type LINESTACK1
+qps_{core}.graph yes"""
+
+REQUESTTIMES_GRAPH_TPL = """multigraph {core}_requesttimes
+graph_title Solr {core} {handler} Time per request
+graph_args -l 0
+graph_vlabel millis
+graph_category solr
+savgtimeperrequest_{core}.label {core} Avg time per request
+savgtimeperrequest_{core}.type gauge
+savgtimeperrequest_{core}.graph yes
+s75thpcrequesttime_{core}.label {core} 75th perc
+s75thpcrequesttime_{core}.type gauge
+s75thpcrequesttime_{core}.graph yes
+s99thpcrequesttime_{core}.label {core} 99th perc
+s99thpcrequesttime_{core}.type gauge
+s99thpcrequesttime_{core}.graph yes
+
+"""
+
+NUMDOCS_GRAPH_TPL = """graph_title Solr Docs %s
+graph_vlabel docs
+docs.label Docs
+graph_category solr"""
+
+INDEXSIZE_GRAPH_TPL = """graph_args --base 1024 -l 0 --upper-limit {availableram}
+graph_vlabel Bytes
+graph_title Index Size
+graph_category solr
+graph_info Solr Index Memory Usage.
+graph_order {cores}
+{cores_config}
+"""
+
+INDEXSIZECORE_GRAPH_TPL = """{core}.label {core}
+{core}.draw STACK""" 
+
+#############################################################################
+# Graph managment
+CHECKS_DEFINED = [
+    'numdocs',
+    'qps',
+    'indexsize',
+    'requesttimes',
+    'documentcache',
+    'fieldvaluecache',
+    'filtercache',
+    'queryresultcache'
+]
+
+class SolrMuninGraph:
+    def __init__(self, hostport, solrmbean):
+        self.solrcoresadmin = SolrCoresAdmin(hostport)
+        self.hostport = hostport
+        self.params = params
+
+    def _getMBean(self, core):
+        return SolrCoreMBean(self.hostport, core)
+
+    def _cacheConfig(self, cacheType, cacheName):
+        return CACHE_GRAPH_TPL.format(core=self.params['core'], cacheType=cacheType, cacheName=cacheName)
+
+    def _cacheFetch(self, cacheType, fields = None):
+        fields = fields or ['size', 'lookups', 'hits', 'inserts', 'evictions']
+        hits_fields = ['lookups', 'hits', 'inserts']
+        size_fields = ['size', 'evictions']
+        results = []
+        solrmbean = self._getMBean(self.params['core'])
+        data = getattr(solrmbean, cacheType)()
+        results.append('multigraph solr_{core}_{cacheType}_hit_rates'.format(core=self.params['core'], cacheType=cacheType))
+        for label in hits_fields:
+            results.append("%s.value %s" % (label, data[label]))
+        results.append('multigraph solr_{core}_{cacheType}_size'.format(core=self.params['core'], cacheType=cacheType))
+        for label in size_fields:
+            results.append("%s.value %s" % (label, data[label]))
+        return "\n".join(results)
+
+    def config(self, mtype):
+        if not mtype:
+            raise CheckException("""Check missing. Available checks: \n\t%s""" % '\n\t'.join(CHECKS_DEFINED))
+        if not hasattr(self, '%sConfig' % mtype):
+            raise CheckException("Unknown check %s" % mtype)
+        return getattr(self, '%sConfig' % mtype)()
+
+    def fetch(self, mtype):
+        if not hasattr(self, params['type']):
+            return None
+        return getattr(self, params['type'])()
+
+    def _getCores(self):
+        if self.params['core']:
+            cores = [self.params['core']]
+        else:
+            cores = sorted(self.solrcoresadmin.getCores())
+        return cores
+
+    def qpsConfig(self):
+        cores = self._getCores()
+        graph = [QPSCORE_GRAPH_TPL.format(core=c) for c in cores ]
+        return QPSMAIN_GRAPH_TPL.format(
+            cores_qps_graphs='\n'.join(graph), 
+            handler=self.params['params']['handler'], 
+            core=self.params['core'], 
+            cores_qps_cdefs='%s,%s' % (','.join(map(lambda x: 'qps_%s' % x, cores)),','.join(['+']*(len(cores)-1)))
+        )
+
+    def qps(self):
+        results = []
+        cores = self._getCores()
+        for c in cores:
+            mbean = self._getMBean(c)
+            results.append('qps_%s.value %s' % (c, mbean.qps(self.params['params']['handler'])))
+        return '\n'.join(results)
+
+    def requesttimesConfig(self):
+        cores = self._getCores()
+        graphs = [REQUESTTIMES_GRAPH_TPL.format(core=c, handler=self.params['params']['handler']) for c in cores ]
+        return '\n'.join(graphs)
+
+    def requesttimes(self):
+        cores = self._getCores()
+        results = []
+        for c in cores:
+            mbean = self._getMBean(c)
+            results.append('multigraph {core}_requesttimes'.format(core=c))
+            for k, time in mbean.requesttimes(self.params['params']['handler']).items():
+                results.append('s%s_%s.value %s' % (k.lower(), c, time))
+        return '\n'.join(results)
+
+    def numdocsConfig(self):
+        return NUMDOCS_GRAPH_TPL % self.params['core']
+
+    def numdocs(self):
+        mbean = self._getMBean(self.params['core'])
+        return 'docs.value %s' % mbean.numdocs(**self.params['params'])
+
+    def indexsizeConfig(self):
+        cores = self._getCores()
+        availableram = os.environ.get('availableram', 16868532224)
+        graph = [ INDEXSIZECORE_GRAPH_TPL.format(core=c) for c in cores]
+        return INDEXSIZE_GRAPH_TPL.format(cores=" ".join(cores), cores_config="\n".join(graph), availableram=availableram)
+
+    def indexsize(self):
+        results = []
+        for c, size in self.solrcoresadmin.indexsize(**self.params['params']).items():
+            results.append("%s.value %s" % (c, size))
+        return "\n".join(results)
+
+    def documentcacheConfig(self):
+        return self._cacheConfig('documentcache', 'Document Cache')
+
+    def documentcache(self):
+        return self._cacheFetch('documentcache')
+
+    def filtercacheConfig(self):
+        return self._cacheConfig('filtercache', 'Filter Cache')
+
+    def filtercache(self):
+        return self._cacheFetch('filtercache')
+
+    def fieldvaluecacheConfig(self):
+        return self._cacheConfig('fieldvaluecache', 'Field Value Cache')
+
+    def fieldvaluecache(self):
+        return self._cacheFetch('fieldvaluecache')
+
+    def queryresultcacheConfig(self):
+        return self._cacheConfig('queryresultcache', 'Query Cache')
+
+    def queryresultcache(self):
+        return self._cacheFetch('queryresultcache')
+
+if __name__ == '__main__':
+    params = parse_params()
+    SOLR_HOST_PORT = os.environ.get('host_port', 'localhost:8080').replace('http://', '')
+    mb = SolrMuninGraph(SOLR_HOST_PORT, params)
+    try:
+        if hasattr(mb, params['op']):
+            print getattr(mb,  params['op'])(params['type'])
+    except Exception, ex:
+        print "ERROR: %s" % ex
+        exit(1)