diff --git a/sensu/files/checks/check_mongodb.py b/sensu/files/checks/check_mongodb.py
new file mode 100644
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+++ b/sensu/files/checks/check_mongodb.py
@@ -0,0 +1,1571 @@
+#!/usr/bin/env python
+
+#
+# A MongoDB Nagios check script
+#
+
+# Script idea taken from a Tag1 script I found and I modified it a lot
+#
+# Main Author
+#   - Mike Zupan <mike@zcentric.com>
+# Contributers
+#   - Frank Brandewiede <brande@travel-iq.com> <brande@bfiw.de> <brande@novolab.de>
+#   - Sam Perman <sam@brightcove.com>
+#   - Shlomo Priymak <shlomoid@gmail.com>
+#   - @jhoff909 on github
+#   - @jbraeuer on github
+#   - Dag Stockstad <dag.stockstad@gmail.com>
+#   - @Andor on github
+#   - Steven Richards - Captainkrtek on github
+#   - Max Vernimmen - @mvernimmen-CG / @mvernimmen on github
+#   - Kris Childress - @kris@nivenly.com github.com/kris-nova
+#
+# USAGE
+#
+# See the README.md
+#
+
+import sys
+import time
+import optparse
+import textwrap
+import re
+import os
+
+try:
+    import pymongo
+except ImportError, e:
+    print e
+    sys.exit(2)
+
+# As of pymongo v 1.9 the SON API is part of the BSON package, therefore attempt
+# to import from there and fall back to pymongo in cases of older pymongo
+if pymongo.version >= "1.9":
+    import bson.son as son
+else:
+    import pymongo.son as son
+
+
+#
+# thanks to http://stackoverflow.com/a/1229667/72987
+#
+def optional_arg(arg_default):
+    def func(option, opt_str, value, parser):
+        if parser.rargs and not parser.rargs[0].startswith('-'):
+            val = parser.rargs[0]
+            parser.rargs.pop(0)
+        else:
+            val = arg_default
+        setattr(parser.values, option.dest, val)
+    return func
+
+
+def performance_data(perf_data, params):
+    data = ''
+    if perf_data:
+        data = " |"
+        for p in params:
+            p += (None, None, None, None)
+            param, param_name, warning, critical = p[0:4]
+            data += "%s=%s" % (param_name, str(param))
+            if warning or critical:
+                warning = warning or 0
+                critical = critical or 0
+                data += ";%s;%s" % (warning, critical)
+
+            data += " "
+
+    return data
+
+
+def numeric_type(param):
+    if ((type(param) == float or type(param) == int or type(param) == long or param == None)):
+        return True
+    return False
+
+
+def check_levels(param, warning, critical, message, ok=[]):
+    if (numeric_type(critical) and numeric_type(warning)):
+        if param >= critical:
+            print "CRITICAL - " + message
+            sys.exit(2)
+        elif param >= warning:
+            print "WARNING - " + message
+            sys.exit(1)
+        else:
+            print "OK - " + message
+            sys.exit(0)
+    else:
+        if param in critical:
+            print "CRITICAL - " + message
+            sys.exit(2)
+
+        if param in warning:
+            print "WARNING - " + message
+            sys.exit(1)
+
+        if param in ok:
+            print "OK - " + message
+            sys.exit(0)
+
+        # unexpected param value
+        print "CRITICAL - Unexpected value : %d" % param + "; " + message
+        return 2
+
+
+def get_server_status(con):
+    try:
+        set_read_preference(con.admin)
+        data = con.admin.command(pymongo.son_manipulator.SON([('serverStatus', 1)]))
+    except:
+        data = con.admin.command(son.SON([('serverStatus', 1)]))
+    return data
+
+
+def main(argv):
+    p = optparse.OptionParser(conflict_handler="resolve", description="This Nagios plugin checks the health of mongodb.")
+
+    p.add_option('-H', '--host', action='store', type='string', dest='host', default='127.0.0.1', help='The hostname you want to connect to')
+    p.add_option('-P', '--port', action='store', type='int', dest='port', default=27017, help='The port mongodb is running on')
+    p.add_option('-u', '--user', action='store', type='string', dest='user', default=None, help='The username you want to login as')
+    p.add_option('-p', '--pass', action='store', type='string', dest='passwd', default=None, help='The password you want to use for that user')
+    p.add_option('-W', '--warning', action='store', dest='warning', default=None, help='The warning threshold you want to set')
+    p.add_option('-C', '--critical', action='store', dest='critical', default=None, help='The critical threshold you want to set')
+    p.add_option('-A', '--action', action='store', type='choice', dest='action', default='connect', help='The action you want to take',
+                 choices=['connect', 'connections', 'replication_lag', 'replication_lag_percent', 'replset_state', 'memory', 'memory_mapped', 'lock',
+                          'flushing', 'last_flush_time', 'index_miss_ratio', 'databases', 'collections', 'database_size', 'database_indexes', 'collection_indexes', 'collection_size',
+                          'collection_storageSize', 'queues', 'oplog', 'journal_commits_in_wl', 'write_data_files', 'journaled', 'opcounters', 'current_lock', 'replica_primary',
+                          'page_faults', 'asserts', 'queries_per_second', 'page_faults', 'chunks_balance', 'connect_primary', 'collection_state', 'row_count', 'replset_quorum'])
+    p.add_option('--max-lag', action='store_true', dest='max_lag', default=False, help='Get max replication lag (for replication_lag action only)')
+    p.add_option('--mapped-memory', action='store_true', dest='mapped_memory', default=False, help='Get mapped memory instead of resident (if resident memory can not be read)')
+    p.add_option('-D', '--perf-data', action='store_true', dest='perf_data', default=False, help='Enable output of Nagios performance data')
+    p.add_option('-d', '--database', action='store', dest='database', default='admin', help='Specify the database to check')
+    p.add_option('--all-databases', action='store_true', dest='all_databases', default=False, help='Check all databases (action database_size)')
+    p.add_option('-s', '--ssl', dest='ssl', default=False, action='callback', callback=optional_arg(True), help='Connect using SSL')
+    p.add_option('-r', '--replicaset', dest='replicaset', default=None, action='callback', callback=optional_arg(True), help='Connect to replicaset')
+    p.add_option('-q', '--querytype', action='store', dest='query_type', default='query', help='The query type to check [query|insert|update|delete|getmore|command] from queries_per_second')
+    p.add_option('-c', '--collection', action='store', dest='collection', default='admin', help='Specify the collection to check')
+    p.add_option('-T', '--time', action='store', type='int', dest='sample_time', default=1, help='Time used to sample number of pages faults')
+    p.add_option('-M', '--mongoversion', action='store', type='choice', dest='mongo_version', default='2', help='The MongoDB version you are talking with, either 2 or 3',
+      choices=['2','3'])
+    p.add_option('-a', '--authdb', action='store', type='string', dest='authdb', default='admin', help='The database you want to authenticate against')
+
+    options, arguments = p.parse_args()
+    host = options.host
+    port = options.port
+    user = options.user
+    passwd = options.passwd
+    authdb = options.authdb
+
+    query_type = options.query_type
+    collection = options.collection
+    sample_time = options.sample_time
+    if (options.action == 'replset_state'):
+        warning = str(options.warning or "")
+        critical = str(options.critical or "")
+    else:
+        warning = float(options.warning or 0)
+        critical = float(options.critical or 0)
+
+    action = options.action
+    perf_data = options.perf_data
+    max_lag = options.max_lag
+    mongo_version = options.mongo_version
+    database = options.database
+    ssl = options.ssl
+    replicaset = options.replicaset
+
+    if action == 'replica_primary' and replicaset is None:
+        return "replicaset must be passed in when using replica_primary check"
+    elif not action == 'replica_primary' and replicaset:
+        return "passing a replicaset while not checking replica_primary does not work"
+
+    #
+    # moving the login up here and passing in the connection
+    #
+    start = time.time()
+    err, con = mongo_connect(host, port, ssl, user, passwd, replicaset, authdb)
+
+    if err != 0:
+        return err
+
+    # Autodetect mongo-version and force pymongo to let us know if it can connect or not.
+    err, mongo_version = check_version(con)
+    if err != 0:
+        return err
+
+    conn_time = time.time() - start
+    conn_time = round(conn_time, 0)
+
+    if action == "connections":
+        return check_connections(con, warning, critical, perf_data)
+    elif action == "replication_lag":
+        return check_rep_lag(con, host, warning, critical, False, perf_data, max_lag, user, passwd)
+    elif action == "replication_lag_percent":
+        return check_rep_lag(con, host, warning, critical, True, perf_data, max_lag, user, passwd)
+    elif action == "replset_state":
+        return check_replset_state(con, perf_data, warning, critical)
+    elif action == "memory":
+        return check_memory(con, warning, critical, perf_data, options.mapped_memory, host)
+    elif action == "memory_mapped":
+        return check_memory_mapped(con, warning, critical, perf_data)
+    elif action == "queues":
+        return check_queues(con, warning, critical, perf_data)
+    elif action == "lock":
+        return check_lock(con, warning, critical, perf_data, mongo_version)
+    elif action == "current_lock":
+        return check_current_lock(con, host, port, warning, critical, perf_data)
+    elif action == "flushing":
+        return check_flushing(con, warning, critical, True, perf_data)
+    elif action == "last_flush_time":
+        return check_flushing(con, warning, critical, False, perf_data)
+    elif action == "index_miss_ratio":
+        index_miss_ratio(con, warning, critical, perf_data)
+    elif action == "databases":
+        return check_databases(con, warning, critical, perf_data)
+    elif action == "collections":
+        return check_collections(con, warning, critical, perf_data)
+    elif action == "oplog":
+        return check_oplog(con, warning, critical, perf_data)
+    elif action == "journal_commits_in_wl":
+        return check_journal_commits_in_wl(con, warning, critical, perf_data)
+    elif action == "database_size":
+        if options.all_databases:
+            return check_all_databases_size(con, warning, critical, perf_data)
+        else:
+            return check_database_size(con, database, warning, critical, perf_data)
+    elif action == "database_indexes":
+        return check_database_indexes(con, database, warning, critical, perf_data)
+    elif action == "collection_indexes":
+        return check_collection_indexes(con, database, collection, warning, critical, perf_data)
+    elif action == "collection_size":
+        return check_collection_size(con, database, collection, warning, critical, perf_data)
+    elif action == "collection_storageSize":
+        return check_collection_storageSize(con, database, collection, warning, critical, perf_data)
+    elif action == "journaled":
+        return check_journaled(con, warning, critical, perf_data)
+    elif action == "write_data_files":
+        return check_write_to_datafiles(con, warning, critical, perf_data)
+    elif action == "opcounters":
+        return check_opcounters(con, host, port, warning, critical, perf_data)
+    elif action == "asserts":
+        return check_asserts(con, host, port, warning, critical, perf_data)
+    elif action == "replica_primary":
+        return check_replica_primary(con, host, warning, critical, perf_data, replicaset, mongo_version)
+    elif action == "queries_per_second":
+        return check_queries_per_second(con, query_type, warning, critical, perf_data, mongo_version)
+    elif action == "page_faults":
+        check_page_faults(con, sample_time, warning, critical, perf_data)
+    elif action == "chunks_balance":
+        chunks_balance(con, database, collection, warning, critical)
+    elif action == "connect_primary":
+        return check_connect_primary(con, warning, critical, perf_data)
+    elif action == "collection_state":
+        return check_collection_state(con, database, collection)
+    elif action == "row_count":
+        return check_row_count(con, database, collection, warning, critical, perf_data)
+    elif action == "replset_quorum":
+        return check_replset_quorum(con, perf_data)
+    else:
+        return check_connect(host, port, warning, critical, perf_data, user, passwd, conn_time)
+
+
+def mongo_connect(host=None, port=None, ssl=False, user=None, passwd=None, replica=None, authdb="admin"):
+    from pymongo.errors import ConnectionFailure
+    from pymongo.errors import PyMongoError
+
+    try:
+        # ssl connection for pymongo > 2.3
+        if pymongo.version >= "2.3":
+            if replica is None:
+                con = pymongo.MongoClient(host, port)
+            else:
+                con = pymongo.MongoClient(host, port, read_preference=pymongo.ReadPreference.SECONDARY, ssl=ssl, replicaSet=replica)
+        else:
+            if replica is None:
+                con = pymongo.MongoClient(host, port, slave_okay=True)
+            else:
+                con = pymongo.MongoClient(host, port, slave_okay=True)
+                #con = pymongo.Connection(host, port, slave_okay=True, replicaSet=replica, network_timeout=10)
+
+        try:
+          result = con.admin.command("ismaster")
+        except ConnectionFailure:
+          print("CRITICAL - Connection to Mongo server on %s:%s has failed" % (host, port) )
+          sys.exit(2)
+
+        if 'arbiterOnly' in result and result['arbiterOnly'] == True:
+            print "OK - State: 7 (Arbiter on port %s)" % (port)
+            sys.exit(0)
+
+        if user and passwd:
+            db = con[authdb]
+            try:
+              db.authenticate(user, password=passwd)
+            except PyMongoError:
+                sys.exit("Username/Password incorrect")
+
+    except Exception, e:
+        if isinstance(e, pymongo.errors.AutoReconnect) and str(e).find(" is an arbiter") != -1:
+            # We got a pymongo AutoReconnect exception that tells us we connected to an Arbiter Server
+            # This means: Arbiter is reachable and can answer requests/votes - this is all we need to know from an arbiter
+            print "OK - State: 7 (Arbiter)"
+            sys.exit(0)
+        return exit_with_general_critical(e), None
+    return 0, con
+
+
+def exit_with_general_warning(e):
+    if isinstance(e, SystemExit):
+        return e
+    else:
+        print "WARNING - General MongoDB warning:", e
+    return 1
+
+
+def exit_with_general_critical(e):
+    if isinstance(e, SystemExit):
+        return e
+    else:
+        print "CRITICAL - General MongoDB Error:", e
+    return 2
+
+
+def set_read_preference(db):
+    if pymongo.version >= "2.2":
+        pymongo.read_preferences.Secondary
+    else:
+        db.read_preference = pymongo.ReadPreference.SECONDARY
+
+def check_version(con):
+    try:
+        server_info = con.server_info()
+    except Exception, e:
+        return exit_with_general_critical(e), None
+    return 0, int(server_info['version'].split('.')[0].strip())
+
+def check_connect(host, port, warning, critical, perf_data, user, passwd, conn_time):
+    warning = warning or 3
+    critical = critical or 6
+    message = "Connection took %i seconds" % conn_time
+    message += performance_data(perf_data, [(conn_time, "connection_time", warning, critical)])
+
+    return check_levels(conn_time, warning, critical, message)
+
+
+def check_connections(con, warning, critical, perf_data):
+    warning = warning or 80
+    critical = critical or 95
+    try:
+        data = get_server_status(con)
+
+        current = float(data['connections']['current'])
+        available = float(data['connections']['available'])
+
+        used_percent = int(float(current / (available + current)) * 100)
+        message = "%i percent (%i of %i connections) used" % (used_percent, current, current + available)
+        message += performance_data(perf_data, [(used_percent, "used_percent", warning, critical),
+                (current, "current_connections"),
+                (available, "available_connections")])
+        return check_levels(used_percent, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_rep_lag(con, host, warning, critical, percent, perf_data, max_lag, user, passwd):
+    # Get mongo to tell us replica set member name when connecting locally
+    if "127.0.0.1" == host:
+        if not "me" in con.admin.command("ismaster","1").keys():
+            print "OK - This is not replicated MongoDB"
+            sys.exit(3)
+
+        host = con.admin.command("ismaster","1")["me"].split(':')[0]
+
+    if percent:
+        warning = warning or 50
+        critical = critical or 75
+    else:
+        warning = warning or 600
+        critical = critical or 3600
+    rs_status = {}
+    slaveDelays = {}
+    try:
+        #set_read_preference(con.admin)
+
+        # Get replica set status
+        try:
+            rs_status = con.admin.command("replSetGetStatus")
+        except pymongo.errors.OperationFailure, e:
+            if ((e.code == None and str(e).find('failed: not running with --replSet"')) or (e.code == 76 and str(e).find('not running with --replSet"'))):
+                print "OK - Not running with replSet"
+                return 0
+
+        serverVersion = tuple(con.server_info()['version'].split('.'))
+        if serverVersion >= tuple("2.0.0".split(".")):
+            #
+            # check for version greater then 2.0
+            #
+            rs_conf = con.local.system.replset.find_one()
+            for member in rs_conf['members']:
+                if member.get('slaveDelay') is not None:
+                    slaveDelays[member['host']] = member.get('slaveDelay')
+                else:
+                    slaveDelays[member['host']] = 0
+
+            # Find the primary and/or the current node
+            primary_node = None
+            host_node = None
+
+            for member in rs_status["members"]:
+                if member["stateStr"] == "PRIMARY":
+                    primary_node = member
+                if member.get('self') == True:
+                    host_node = member
+
+            # Check if we're in the middle of an election and don't have a primary
+            if primary_node is None:
+                print "WARNING - No primary defined. In an election?"
+                return 1
+
+            # Check if we failed to find the current host
+            # below should never happen
+            if host_node is None:
+                print "CRITICAL - Unable to find host '" + host + "' in replica set."
+                return 2
+
+            # Is the specified host the primary?
+            if host_node["stateStr"] == "PRIMARY":
+                if max_lag == False:
+                    print "OK - This is the primary."
+                    return 0
+                else:
+                    #get the maximal replication lag
+                    data = ""
+                    maximal_lag = 0
+                    for member in rs_status['members']:
+                        if not member['stateStr'] == "ARBITER":
+                            lastSlaveOpTime = member['optimeDate']
+                            replicationLag = abs(primary_node["optimeDate"] - lastSlaveOpTime).seconds - slaveDelays[member['name']]
+                            data = data + member['name'] + " lag=%d;" % replicationLag
+                            maximal_lag = max(maximal_lag, replicationLag)
+                    if percent:
+                        err, con = mongo_connect(primary_node['name'].split(':')[0], int(primary_node['name'].split(':')[1]), False, user, passwd)
+                        if err != 0:
+                            return err
+                        primary_timediff = replication_get_time_diff(con)
+                        maximal_lag = int(float(maximal_lag) / float(primary_timediff) * 100)
+                        message = "Maximal lag is " + str(maximal_lag) + " percents"
+                        message += performance_data(perf_data, [(maximal_lag, "replication_lag_percent", warning, critical)])
+                    else:
+                        message = "Maximal lag is " + str(maximal_lag) + " seconds"
+                        message += performance_data(perf_data, [(maximal_lag, "replication_lag", warning, critical)])
+                    return check_levels(maximal_lag, warning, critical, message)
+            elif host_node["stateStr"] == "ARBITER":
+                print "OK - This is an arbiter"
+                return 0
+
+            # Find the difference in optime between current node and PRIMARY
+
+            optime_lag = abs(primary_node["optimeDate"] - host_node["optimeDate"])
+
+            if host_node['name'] in slaveDelays:
+                slave_delay = slaveDelays[host_node['name']]
+            elif host_node['name'].endswith(':27017') and host_node['name'][:-len(":27017")] in slaveDelays:
+                slave_delay = slaveDelays[host_node['name'][:-len(":27017")]]
+            else:
+                raise Exception("Unable to determine slave delay for {0}".format(host_node['name']))
+
+            try:  # work starting from python2.7
+                lag = optime_lag.total_seconds()
+            except:
+                lag = float(optime_lag.seconds + optime_lag.days * 24 * 3600)
+
+            if percent:
+                err, con = mongo_connect(primary_node['name'].split(':')[0], int(primary_node['name'].split(':')[1]), False, user, passwd)
+                if err != 0:
+                    return err
+                primary_timediff = replication_get_time_diff(con)
+                if primary_timediff != 0:
+                    lag = int(float(lag) / float(primary_timediff) * 100)
+                else:
+                    lag = 0
+                message = "Lag is " + str(lag) + " percents"
+                message += performance_data(perf_data, [(lag, "replication_lag_percent", warning, critical)])
+            else:
+                message = "Lag is " + str(lag) + " seconds"
+                message += performance_data(perf_data, [(lag, "replication_lag", warning, critical)])
+            return check_levels(lag, warning + slaveDelays[host_node['name']], critical + slaveDelays[host_node['name']], message)
+        else:
+            #
+            # less than 2.0 check
+            #
+            # Get replica set status
+            rs_status = con.admin.command("replSetGetStatus")
+
+            # Find the primary and/or the current node
+            primary_node = None
+            host_node = None
+            for member in rs_status["members"]:
+                if member["stateStr"] == "PRIMARY":
+                    primary_node = (member["name"], member["optimeDate"])
+                if member["name"].split(":")[0].startswith(host):
+                    host_node = member
+
+            # Check if we're in the middle of an election and don't have a primary
+            if primary_node is None:
+                print "WARNING - No primary defined. In an election?"
+                sys.exit(1)
+
+            # Is the specified host the primary?
+            if host_node["stateStr"] == "PRIMARY":
+                print "OK - This is the primary."
+                sys.exit(0)
+
+            # Find the difference in optime between current node and PRIMARY
+            optime_lag = abs(primary_node[1] - host_node["optimeDate"])
+            lag = optime_lag.seconds
+            if percent:
+                err, con = mongo_connect(primary_node['name'].split(':')[0], int(primary_node['name'].split(':')[1]))
+                if err != 0:
+                    return err
+                primary_timediff = replication_get_time_diff(con)
+                lag = int(float(lag) / float(primary_timediff) * 100)
+                message = "Lag is " + str(lag) + " percents"
+                message += performance_data(perf_data, [(lag, "replication_lag_percent", warning, critical)])
+            else:
+                message = "Lag is " + str(lag) + " seconds"
+                message += performance_data(perf_data, [(lag, "replication_lag", warning, critical)])
+            return check_levels(lag, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+#
+# Check the memory usage of mongo. Alerting on this may be hard to get right
+# because it'll try to get as much memory as it can. And that's probably
+# a good thing.
+#
+def check_memory(con, warning, critical, perf_data, mapped_memory, host):
+    # Get the total system memory of this system (This is totally bogus if you
+    # are running this command remotely) and calculate based on that how much
+    # memory used by Mongodb is ok or not.
+    meminfo = open('/proc/meminfo').read()
+    matched = re.search(r'^MemTotal:\s+(\d+)', meminfo)
+    if matched:
+        mem_total_kB = int(matched.groups()[0])
+
+    if host != "127.0.0.1" and not warning:
+      # Running remotely and value was not set by user, use hardcoded value
+      warning = 12
+    else:
+      # running locally or user provided value
+      warning = warning or (mem_total_kB * 0.8) / 1024.0 / 1024.0
+
+    if host != "127.0.0.1" and not critical:
+      critical = 16
+    else:
+      critical = critical or (mem_total_kB * 0.9) / 1024.0 / 1024.0
+
+    # debugging
+    #print "mem total: {0}kb, warn: {1}GB, crit: {2}GB".format(mem_total_kB,warning, critical)
+
+    try:
+        data = get_server_status(con)
+        if not data['mem']['supported'] and not mapped_memory:
+            print "OK - Platform not supported for memory info"
+            return 0
+        #
+        # convert to gigs
+        #
+        message = "Memory Usage:"
+        try:
+            mem_resident = float(data['mem']['resident']) / 1024.0
+            message += " %.2fGB resident," % (mem_resident)
+        except:
+            mem_resident = 0
+            message += " resident unsupported,"
+        try:
+            mem_virtual = float(data['mem']['virtual']) / 1024.0
+            message += " %.2fGB virtual," % mem_virtual
+        except:
+            mem_virtual = 0
+            message += " virtual unsupported,"
+        try:
+            mem_mapped = float(data['mem']['mapped']) / 1024.0
+            message += " %.2fGB mapped," % mem_mapped
+        except:
+            mem_mapped = 0
+            message += " mapped unsupported,"
+        try:
+            mem_mapped_journal = float(data['mem']['mappedWithJournal']) / 1024.0
+            message += " %.2fGB mappedWithJournal" % mem_mapped_journal
+        except:
+            mem_mapped_journal = 0
+        message += performance_data(perf_data, [("%.2f" % mem_resident, "memory_usage", warning, critical),
+                    ("%.2f" % mem_mapped, "memory_mapped"), ("%.2f" % mem_virtual, "memory_virtual"), ("%.2f" % mem_mapped_journal, "mappedWithJournal")])
+        #added for unsupported systems like Solaris
+        if mapped_memory and mem_resident == 0:
+            return check_levels(mem_mapped, warning, critical, message)
+        else:
+            return check_levels(mem_resident, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_memory_mapped(con, warning, critical, perf_data):
+    #
+    # These thresholds are basically meaningless, and must be customized to your application
+    #
+    warning = warning or 8
+    critical = critical or 16
+    try:
+        data = get_server_status(con)
+        if not data['mem']['supported']:
+            print "OK - Platform not supported for memory info"
+            return 0
+        #
+        # convert to gigs
+        #
+        message = "Memory Usage:"
+        try:
+            mem_mapped = float(data['mem']['mapped']) / 1024.0
+            message += " %.2fGB mapped," % mem_mapped
+        except:
+            mem_mapped = -1
+            message += " mapped unsupported,"
+        try:
+            mem_mapped_journal = float(data['mem']['mappedWithJournal']) / 1024.0
+            message += " %.2fGB mappedWithJournal" % mem_mapped_journal
+        except:
+            mem_mapped_journal = 0
+        message += performance_data(perf_data, [("%.2f" % mem_mapped, "memory_mapped", warning, critical), ("%.2f" % mem_mapped_journal, "mappedWithJournal")])
+
+        if not mem_mapped == -1:
+            return check_levels(mem_mapped, warning, critical, message)
+        else:
+            print "OK - Server does not provide mem.mapped info"
+            return 0
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+#
+# Return the percentage of the time there was a global Lock
+#
+def check_lock(con, warning, critical, perf_data, mongo_version):
+    warning = warning or 10
+    critical = critical or 30
+    if mongo_version == 2:
+        try:
+            data = get_server_status(con)
+            lockTime = data['globalLock']['lockTime']
+            totalTime = data['globalLock']['totalTime']
+            #
+            # calculate percentage
+            #
+            if lockTime > totalTime:
+                lock_percentage = 0.00
+            else:
+                lock_percentage = float(lockTime) / float(totalTime) * 100
+            message = "Lock Percentage: %.2f%%" % lock_percentage
+            message += performance_data(perf_data, [("%.2f" % lock_percentage, "lock_percentage", warning, critical)])
+            return check_levels(lock_percentage, warning, critical, message)
+        except Exception, e:
+            print "Couldn't get globalLock lockTime info from mongo, are you sure you're not using version 3? See the -M option."
+            return exit_with_general_critical(e)
+    else:
+        print "OK - MongoDB version 3 doesn't report on global locks"
+        return 0
+
+
+def check_flushing(con, warning, critical, avg, perf_data):
+    #
+    # These thresholds mean it's taking 5 seconds to perform a background flush to issue a warning
+    # and 10 seconds to issue a critical.
+    #
+    warning = warning or 5000
+    critical = critical or 15000
+    try:
+        data = get_server_status(con)
+        try:
+            data['backgroundFlushing']
+            if avg:
+                flush_time = float(data['backgroundFlushing']['average_ms'])
+                stat_type = "Average"
+            else:
+                flush_time = float(data['backgroundFlushing']['last_ms'])
+                stat_type = "Last"
+
+            message = "%s Flush Time: %.2fms" % (stat_type, flush_time)
+            message += performance_data(perf_data, [("%.2fms" % flush_time, "%s_flush_time" % stat_type.lower(), warning, critical)])
+
+            return check_levels(flush_time, warning, critical, message)
+        except Exception:
+            print "OK - flushing stats not available for this storage engine"
+            return 0
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def index_miss_ratio(con, warning, critical, perf_data):
+    warning = warning or 10
+    critical = critical or 30
+    try:
+        data = get_server_status(con)
+
+        try:
+            data['indexCounters']
+            serverVersion = tuple(con.server_info()['version'].split('.'))
+            if serverVersion >= tuple("2.4.0".split(".")):
+                miss_ratio = float(data['indexCounters']['missRatio'])
+            else:
+                miss_ratio = float(data['indexCounters']['btree']['missRatio'])
+        except KeyError:
+            not_supported_msg = "not supported on this platform"
+            try:
+                data['indexCounters']
+                if data['indexCounters'].has_key('note'):
+                    print "OK - MongoDB says: " + not_supported_msg
+                    return 0
+                else:
+                    print "WARNING - Can't get counter from MongoDB"
+                    return 1
+            except Exception:
+                print "OK - MongoDB says: " + not_supported_msg
+                return 0
+
+        message = "Miss Ratio: %.2f" % miss_ratio
+        message += performance_data(perf_data, [("%.2f" % miss_ratio, "index_miss_ratio", warning, critical)])
+
+        return check_levels(miss_ratio, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+def check_replset_quorum(con, perf_data):
+    db = con['admin']
+    warning = 1
+    critical = 2
+    primary = 0
+
+    try:
+        rs_members = db.command("replSetGetStatus")['members']
+
+        for member in rs_members:
+            if member['state'] == 1:
+                primary += 1
+
+        if primary == 1:
+            state = 0
+            message = "Cluster is quorate"
+        else:
+            state = 2
+            message = "Cluster is not quorate and cannot operate"
+
+        return check_levels(state, warning, critical, message)
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+
+def check_replset_state(con, perf_data, warning="", critical=""):
+    try:
+        warning = [int(x) for x in warning.split(",")]
+    except:
+        warning = [0, 3, 5]
+    try:
+        critical = [int(x) for x in critical.split(",")]
+    except:
+        critical = [8, 4, -1]
+
+    ok = range(-1, 8)  # should include the range of all posiible values
+    try:
+        try:
+            try:
+                set_read_preference(con.admin)
+                data = con.admin.command(pymongo.son_manipulator.SON([('replSetGetStatus', 1)]))
+            except:
+                data = con.admin.command(son.SON([('replSetGetStatus', 1)]))
+            state = int(data['myState'])
+        except pymongo.errors.OperationFailure, e:
+            if ((e.code == None and str(e).find('failed: not running with --replSet"')) or (e.code == 76 and str(e).find('not running with --replSet"'))):
+                state = -1
+
+        if state == 8:
+            message = "State: %i (Down)" % state
+        elif state == 4:
+            message = "State: %i (Fatal error)" % state
+        elif state == 0:
+            message = "State: %i (Starting up, phase1)" % state
+        elif state == 3:
+            message = "State: %i (Recovering)" % state
+        elif state == 5:
+            message = "State: %i (Starting up, phase2)" % state
+        elif state == 1:
+            message = "State: %i (Primary)" % state
+        elif state == 2:
+            message = "State: %i (Secondary)" % state
+        elif state == 7:
+            message = "State: %i (Arbiter)" % state
+        elif state == -1:
+            message = "Not running with replSet"
+        else:
+            message = "State: %i (Unknown state)" % state
+        message += performance_data(perf_data, [(state, "state")])
+        return check_levels(state, warning, critical, message, ok)
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_databases(con, warning, critical, perf_data=None):
+    try:
+        try:
+            set_read_preference(con.admin)
+            data = con.admin.command(pymongo.son_manipulator.SON([('listDatabases', 1)]))
+        except:
+            data = con.admin.command(son.SON([('listDatabases', 1)]))
+
+        count = len(data['databases'])
+        message = "Number of DBs: %.0f" % count
+        message += performance_data(perf_data, [(count, "databases", warning, critical, message)])
+        return check_levels(count, warning, critical, message)
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_collections(con, warning, critical, perf_data=None):
+    try:
+        try:
+            set_read_preference(con.admin)
+            data = con.admin.command(pymongo.son_manipulator.SON([('listDatabases', 1)]))
+        except:
+            data = con.admin.command(son.SON([('listDatabases', 1)]))
+
+        count = 0
+        for db in data['databases']:
+            dbase = con[db['name']]
+            set_read_preference(dbase)
+            count += len(dbase.collection_names())
+
+        message = "Number of collections: %.0f" % count
+        message += performance_data(perf_data, [(count, "collections", warning, critical, message)])
+        return check_levels(count, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_all_databases_size(con, warning, critical, perf_data):
+    warning = warning or 100
+    critical = critical or 1000
+    try:
+        set_read_preference(con.admin)
+        all_dbs_data = con.admin.command(pymongo.son_manipulator.SON([('listDatabases', 1)]))
+    except:
+        all_dbs_data = con.admin.command(son.SON([('listDatabases', 1)]))
+
+    total_storage_size = 0
+    message = ""
+    perf_data_param = [()]
+    for db in all_dbs_data['databases']:
+        database = db['name']
+        data = con[database].command('dbstats')
+        storage_size = round(data['storageSize'] / 1024 / 1024, 1)
+        message += "; Database %s size: %.0f MB" % (database, storage_size)
+        perf_data_param.append((storage_size, database + "_database_size"))
+        total_storage_size += storage_size
+
+    perf_data_param[0] = (total_storage_size, "total_size", warning, critical)
+    message += performance_data(perf_data, perf_data_param)
+    message = "Total size: %.0f MB" % total_storage_size + message
+    return check_levels(total_storage_size, warning, critical, message)
+
+
+def check_database_size(con, database, warning, critical, perf_data):
+    warning = warning or 100
+    critical = critical or 1000
+    perfdata = ""
+    try:
+        set_read_preference(con.admin)
+        data = con[database].command('dbstats')
+        storage_size = data['storageSize'] / 1024 / 1024
+        if perf_data:
+            perfdata += " | database_size=%i;%i;%i" % (storage_size, warning, critical)
+            #perfdata += " database=%s" %(database)
+
+        if storage_size >= critical:
+            print "CRITICAL - Database size: %.0f MB, Database: %s%s" % (storage_size, database, perfdata)
+            return 2
+        elif storage_size >= warning:
+            print "WARNING - Database size: %.0f MB, Database: %s%s" % (storage_size, database, perfdata)
+            return 1
+        else:
+            print "OK - Database size: %.0f MB, Database: %s%s" % (storage_size, database, perfdata)
+            return 0
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_database_indexes(con, database, warning, critical, perf_data):
+    #
+    # These thresholds are basically meaningless, and must be customized to your application
+    #
+    warning = warning or 100
+    critical = critical or 1000
+    perfdata = ""
+    try:
+        set_read_preference(con.admin)
+        data = con[database].command('dbstats')
+        index_size = data['indexSize'] / 1024 / 1024
+        if perf_data:
+            perfdata += " | database_indexes=%i;%i;%i" % (index_size, warning, critical)
+
+        if index_size >= critical:
+            print "CRITICAL - %s indexSize: %.0f MB %s" % (database, index_size, perfdata)
+            return 2
+        elif index_size >= warning:
+            print "WARNING - %s indexSize: %.0f MB %s" % (database, index_size, perfdata)
+            return 1
+        else:
+            print "OK - %s indexSize: %.0f MB %s" % (database, index_size, perfdata)
+            return 0
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_collection_indexes(con, database, collection, warning, critical, perf_data):
+    #
+    # These thresholds are basically meaningless, and must be customized to your application
+    #
+    warning = warning or 100
+    critical = critical or 1000
+    perfdata = ""
+    try:
+        set_read_preference(con.admin)
+        data = con[database].command('collstats', collection)
+        total_index_size = data['totalIndexSize'] / 1024 / 1024
+        if perf_data:
+            perfdata += " | collection_indexes=%i;%i;%i" % (total_index_size, warning, critical)
+
+        if total_index_size >= critical:
+            print "CRITICAL - %s.%s totalIndexSize: %.0f MB %s" % (database, collection, total_index_size, perfdata)
+            return 2
+        elif total_index_size >= warning:
+            print "WARNING - %s.%s totalIndexSize: %.0f MB %s" % (database, collection, total_index_size, perfdata)
+            return 1
+        else:
+            print "OK - %s.%s totalIndexSize: %.0f MB %s" % (database, collection, total_index_size, perfdata)
+            return 0
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_queues(con, warning, critical, perf_data):
+    warning = warning or 10
+    critical = critical or 30
+    try:
+        data = get_server_status(con)
+
+        total_queues = float(data['globalLock']['currentQueue']['total'])
+        readers_queues = float(data['globalLock']['currentQueue']['readers'])
+        writers_queues = float(data['globalLock']['currentQueue']['writers'])
+        message = "Current queue is : total = %d, readers = %d, writers = %d" % (total_queues, readers_queues, writers_queues)
+        message += performance_data(perf_data, [(total_queues, "total_queues", warning, critical), (readers_queues, "readers_queues"), (writers_queues, "writers_queues")])
+        return check_levels(total_queues, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+def check_collection_size(con, database, collection, warning, critical, perf_data):
+    warning = warning or 100
+    critical = critical or 1000
+    perfdata = ""
+    try:
+        set_read_preference(con.admin)
+        data = con[database].command('collstats', collection)
+        size = data['size'] / 1024 / 1024
+        if perf_data:
+            perfdata += " | collection_size=%i;%i;%i" % (size, warning, critical)
+
+        if size >= critical:
+            print "CRITICAL - %s.%s size: %.0f MB %s" % (database, collection, size, perfdata)
+            return 2
+        elif size >= warning:
+            print "WARNING - %s.%s size: %.0f MB %s" % (database, collection, size, perfdata)
+            return 1
+        else:
+            print "OK - %s.%s size: %.0f MB %s" % (database, collection, size, perfdata)
+            return 0
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_collection_storageSize(con, database, collection, warning, critical, perf_data):
+    warning = warning or 100
+    critical = critical or 1000
+    perfdata = ""
+    try:
+        set_read_preference(con.admin)
+        data = con[database].command('collstats', collection)
+        storageSize = data['storageSize'] / 1024 / 1024
+        if perf_data:
+            perfdata += " | collection_storageSize=%i;%i;%i" % (storageSize, warning, critical)
+
+        if storageSize >= critical:
+            print "CRITICAL - %s.%s storageSize: %.0f MB %s" % (database, collection, storageSize, perfdata)
+            return 2
+        elif storageSize >= warning:
+            print "WARNING - %s.%s storageSize: %.0f MB %s" % (database, collection, storageSize, perfdata)
+            return 1
+        else:
+            print "OK - %s.%s storageSize: %.0f MB %s" % (database, collection, storageSize, perfdata)
+            return 0
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_queries_per_second(con, query_type, warning, critical, perf_data, mongo_version):
+    warning = warning or 250
+    critical = critical or 500
+
+    if query_type not in ['insert', 'query', 'update', 'delete', 'getmore', 'command']:
+        return exit_with_general_critical("The query type of '%s' is not valid" % query_type)
+
+    try:
+        db = con.local
+        data = get_server_status(con)
+
+        # grab the count
+        num = int(data['opcounters'][query_type])
+
+        # do the math
+        last_count = db.nagios_check.find_one({'check': 'query_counts'})
+        try:
+            ts = int(time.time())
+            diff_query = num - last_count['data'][query_type]['count']
+            diff_ts = ts - last_count['data'][query_type]['ts']
+
+            if diff_ts == 0:
+                message = "diff_query = " + str(diff_query) + " diff_ts = " + str(diff_ts)
+                return check_levels(0, warning, critical, message)
+
+            query_per_sec = float(diff_query) / float(diff_ts)
+
+            # update the count now
+            if mongo_version == 2:
+                db.nagios_check.update({u'_id': last_count['_id']}, {'$set': {"data.%s" % query_type: {'count': num, 'ts': int(time.time())}}})
+            else:
+                db.nagios_check.update_one({u'_id': last_count['_id']}, {'$set': {"data.%s" % query_type: {'count': num, 'ts': int(time.time())}}})
+
+            message = "Queries / Sec: %f" % query_per_sec
+            message += performance_data(perf_data, [(query_per_sec, "%s_per_sec" % query_type, warning, critical, message)])
+        except KeyError:
+            #
+            # since it is the first run insert it
+            query_per_sec = 0
+            message = "First run of check.. no data"
+            if mongo_version == 2:
+                db.nagios_check.update({u'_id': last_count['_id']}, {'$set': {"data.%s" % query_type: {'count': num, 'ts': int(time.time())}}})
+            else:
+                db.nagios_check.update_one({u'_id': last_count['_id']}, {'$set': {"data.%s" % query_type: {'count': num, 'ts': int(time.time())}}})
+
+        except TypeError:
+            #
+            # since it is the first run insert it
+            query_per_sec = 0
+            message = "First run of check.. no data"
+            if mongo_version == 2:
+                db.nagios_check.insert({'check': 'query_counts', 'data': {query_type: {'count': num, 'ts': int(time.time())}}})
+            else:
+                db.nagios_check.insert_one({'check': 'query_counts', 'data': {query_type: {'count': num, 'ts': int(time.time())}}})
+
+        return check_levels(query_per_sec, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_oplog(con, warning, critical, perf_data):
+    """ Checking the oplog time - the time of the log currntly saved in the oplog collection
+    defaults:
+        critical 4 hours
+        warning 24 hours
+    those can be changed as usual with -C and -W parameters"""
+    warning = warning or 24
+    critical = critical or 4
+    try:
+        db = con.local
+        ol = db.system.namespaces.find_one({"name": "local.oplog.rs"})
+        if (db.system.namespaces.find_one({"name": "local.oplog.rs"}) != None):
+            oplog = "oplog.rs"
+        else:
+            ol = db.system.namespaces.find_one({"name": "local.oplog.$main"})
+            if (db.system.namespaces.find_one({"name": "local.oplog.$main"}) != None):
+                oplog = "oplog.$main"
+            else:
+                message = "neither master/slave nor replica set replication detected"
+                return check_levels(None, warning, critical, message)
+
+        try:
+                set_read_preference(con.admin)
+                data = con.local.command(pymongo.son_manipulator.SON([('collstats', oplog)]))
+        except:
+                data = con.admin.command(son.SON([('collstats', oplog)]))
+
+        ol_size = data['size']
+        ol_storage_size = data['storageSize']
+        ol_used_storage = int(float(ol_size) / ol_storage_size * 100 + 1)
+        ol = con.local[oplog]
+        firstc = ol.find().sort("$natural", pymongo.ASCENDING).limit(1)[0]['ts']
+        lastc = ol.find().sort("$natural", pymongo.DESCENDING).limit(1)[0]['ts']
+        time_in_oplog = (lastc.as_datetime() - firstc.as_datetime())
+        message = "Oplog saves " + str(time_in_oplog) + " %d%% used" % ol_used_storage
+        try:  # work starting from python2.7
+            hours_in_oplog = time_in_oplog.total_seconds() / 60 / 60
+        except:
+            hours_in_oplog = float(time_in_oplog.seconds + time_in_oplog.days * 24 * 3600) / 60 / 60
+        approx_level = hours_in_oplog * 100 / ol_used_storage
+        message += performance_data(perf_data, [("%.2f" % hours_in_oplog, 'oplog_time', warning, critical), ("%.2f " % approx_level, 'oplog_time_100_percent_used')])
+        return check_levels(-approx_level, -warning, -critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_journal_commits_in_wl(con, warning, critical, perf_data):
+    """  Checking the number of commits which occurred in the db's write lock.
+Most commits are performed outside of this lock; committed while in the write lock is undesirable.
+Under very high write situations it is normal for this value to be nonzero.  """
+
+    warning = warning or 10
+    critical = critical or 40
+    try:
+        data = get_server_status(con)
+        j_commits_in_wl = data['dur']['commitsInWriteLock']
+        message = "Journal commits in DB write lock : %d" % j_commits_in_wl
+        message += performance_data(perf_data, [(j_commits_in_wl, "j_commits_in_wl", warning, critical)])
+        return check_levels(j_commits_in_wl, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_journaled(con, warning, critical, perf_data):
+    """ Checking the average amount of data in megabytes written to the recovery log in the last four seconds"""
+
+    warning = warning or 20
+    critical = critical or 40
+    try:
+        data = get_server_status(con)
+        journaled = data['dur']['journaledMB']
+        message = "Journaled : %.2f MB" % journaled
+        message += performance_data(perf_data, [("%.2f" % journaled, "journaled", warning, critical)])
+        return check_levels(journaled, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_write_to_datafiles(con, warning, critical, perf_data):
+    """    Checking the average amount of data in megabytes written to the databases datafiles in the last four seconds.
+As these writes are already journaled, they can occur lazily, and thus the number indicated here may be lower
+than the amount physically written to disk."""
+    warning = warning or 20
+    critical = critical or 40
+    try:
+        data = get_server_status(con)
+        writes = data['dur']['writeToDataFilesMB']
+        message = "Write to data files : %.2f MB" % writes
+        message += performance_data(perf_data, [("%.2f" % writes, "write_to_data_files", warning, critical)])
+        return check_levels(writes, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def get_opcounters(data, opcounters_name, host, port):
+    try:
+        insert = data[opcounters_name]['insert']
+        query = data[opcounters_name]['query']
+        update = data[opcounters_name]['update']
+        delete = data[opcounters_name]['delete']
+        getmore = data[opcounters_name]['getmore']
+        command = data[opcounters_name]['command']
+    except KeyError, e:
+        return 0, [0] * 100
+    total_commands = insert + query + update + delete + getmore + command
+    new_vals = [total_commands, insert, query, update, delete, getmore, command]
+    return  maintain_delta(new_vals, host, port, opcounters_name)
+
+
+def check_opcounters(con, host, port, warning, critical, perf_data):
+    """ A function to get all opcounters delta per minute. In case of a replication - gets the opcounters+opcountersRepl"""
+    warning = warning or 10000
+    critical = critical or 15000
+
+    data = get_server_status(con)
+    err1, delta_opcounters = get_opcounters(data, 'opcounters', host, port)
+    err2, delta_opcounters_repl = get_opcounters(data, 'opcountersRepl', host, port)
+    if err1 == 0 and err2 == 0:
+        delta = [(x + y) for x, y in zip(delta_opcounters, delta_opcounters_repl)]
+        delta[0] = delta_opcounters[0]  # only the time delta shouldn't be summarized
+        per_minute_delta = [int(x / delta[0] * 60) for x in delta[1:]]
+        message = "Test succeeded , old values missing"
+        message = "Opcounters: total=%d,insert=%d,query=%d,update=%d,delete=%d,getmore=%d,command=%d" % tuple(per_minute_delta)
+        message += performance_data(perf_data, ([(per_minute_delta[0], "total", warning, critical), (per_minute_delta[1], "insert"),
+                    (per_minute_delta[2], "query"), (per_minute_delta[3], "update"), (per_minute_delta[4], "delete"),
+                    (per_minute_delta[5], "getmore"), (per_minute_delta[6], "command")]))
+        return check_levels(per_minute_delta[0], warning, critical, message)
+    else:
+        return exit_with_general_critical("problem reading data from temp file")
+
+
+def check_current_lock(con, host, port, warning, critical, perf_data):
+    """ A function to get current lock percentage and not a global one, as check_lock function does"""
+    warning = warning or 10
+    critical = critical or 30
+    data = get_server_status(con)
+
+    lockTime = float(data['globalLock']['lockTime'])
+    totalTime = float(data['globalLock']['totalTime'])
+
+    err, delta = maintain_delta([totalTime, lockTime], host, port, "locktime")
+    if err == 0:
+        lock_percentage = delta[2] / delta[1] * 100     # lockTime/totalTime*100
+        message = "Current Lock Percentage: %.2f%%" % lock_percentage
+        message += performance_data(perf_data, [("%.2f" % lock_percentage, "current_lock_percentage", warning, critical)])
+        return check_levels(lock_percentage, warning, critical, message)
+    else:
+        return exit_with_general_warning("problem reading data from temp file")
+
+
+def check_page_faults(con, host, port, warning, critical, perf_data):
+    """ A function to get page_faults per second from the system"""
+    warning = warning or 10
+    critical = critical or 30
+    data = get_server_status(con)
+
+    try:
+        page_faults = float(data['extra_info']['page_faults'])
+    except:
+        # page_faults unsupported on the underlaying system
+        return exit_with_general_critical("page_faults unsupported on the underlaying system")
+
+    err, delta = maintain_delta([page_faults], host, port, "page_faults")
+    if err == 0:
+        page_faults_ps = delta[1] / delta[0]
+        message = "Page faults : %.2f ps" % page_faults_ps
+        message += performance_data(perf_data, [("%.2f" % page_faults_ps, "page_faults_ps", warning, critical)])
+        return check_levels(page_faults_ps, warning, critical, message)
+    else:
+        return exit_with_general_warning("problem reading data from temp file")
+
+
+def check_asserts(con, host, port, warning, critical, perf_data):
+    """ A function to get asserts from the system"""
+    warning = warning or 1
+    critical = critical or 10
+    data = get_server_status(con)
+
+    asserts = data['asserts']
+
+    #{ "regular" : 0, "warning" : 6, "msg" : 0, "user" : 12, "rollovers" : 0 }
+    regular = asserts['regular']
+    warning_asserts = asserts['warning']
+    msg = asserts['msg']
+    user = asserts['user']
+    rollovers = asserts['rollovers']
+
+    err, delta = maintain_delta([regular, warning_asserts, msg, user, rollovers], host, port, "asserts")
+
+    if err == 0:
+        if delta[5] != 0:
+            #the number of rollovers were increased
+            warning = -1  # no matter the metrics this situation should raise a warning
+            # if this is normal rollover - the warning will not appear again, but if there will be a lot of asserts
+            # the warning will stay for a long period of time
+            # although this is not a usual situation
+
+        regular_ps = delta[1] / delta[0]
+        warning_ps = delta[2] / delta[0]
+        msg_ps = delta[3] / delta[0]
+        user_ps = delta[4] / delta[0]
+        rollovers_ps = delta[5] / delta[0]
+        total_ps = regular_ps + warning_ps + msg_ps + user_ps
+        message = "Total asserts : %.2f ps" % total_ps
+        message += performance_data(perf_data, [(total_ps, "asserts_ps", warning, critical), (regular_ps, "regular"),
+                    (warning_ps, "warning"), (msg_ps, "msg"), (user_ps, "user")])
+        return check_levels(total_ps, warning, critical, message)
+    else:
+        return exit_with_general_warning("problem reading data from temp file")
+
+
+def get_stored_primary_server_name(db):
+    """ get the stored primary server name from db. """
+    if "last_primary_server" in db.collection_names():
+        stored_primary_server = db.last_primary_server.find_one()["server"]
+    else:
+        stored_primary_server = None
+
+    return stored_primary_server
+
+
+def check_replica_primary(con, host, warning, critical, perf_data, replicaset, mongo_version):
+    """ A function to check if the primary server of a replica set has changed """
+    if warning is None and critical is None:
+        warning = 1
+    warning = warning or 2
+    critical = critical or 2
+
+    primary_status = 0
+    message = "Primary server has not changed"
+    db = con["nagios"]
+    data = get_server_status(con)
+    if replicaset != data['repl'].get('setName'):
+        message = "Replica set requested: %s differs from the one found: %s" % (replicaset, data['repl'].get('setName'))
+        primary_status = 2
+        return check_levels(primary_status, warning, critical, message)
+    current_primary = data['repl'].get('primary')
+    saved_primary = get_stored_primary_server_name(db)
+    if current_primary is None:
+        current_primary = "None"
+    if saved_primary is None:
+        saved_primary = "None"
+    if current_primary != saved_primary:
+        last_primary_server_record = {"server": current_primary}
+        if mongo_version == 2:
+            db.last_primary_server.update({"_id": "last_primary"}, {"$set": last_primary_server_record}, upsert=True)
+        else:
+            db.last_primary_server.update_one({"_id": "last_primary"}, {"$set": last_primary_server_record}, upsert=True)
+        message = "Primary server has changed from %s to %s" % (saved_primary, current_primary)
+        primary_status = 1
+    return check_levels(primary_status, warning, critical, message)
+
+
+def check_page_faults(con, sample_time, warning, critical, perf_data):
+    warning = warning or 10
+    critical = critical or 20
+    try:
+        try:
+            set_read_preference(con.admin)
+            data1 = con.admin.command(pymongo.son_manipulator.SON([('serverStatus', 1)]))
+            time.sleep(sample_time)
+            data2 = con.admin.command(pymongo.son_manipulator.SON([('serverStatus', 1)]))
+        except:
+            data1 = con.admin.command(son.SON([('serverStatus', 1)]))
+            time.sleep(sample_time)
+            data2 = con.admin.command(son.SON([('serverStatus', 1)]))
+
+        try:
+            #on linux servers only
+            page_faults = (int(data2['extra_info']['page_faults']) - int(data1['extra_info']['page_faults'])) / sample_time
+        except KeyError:
+            print "WARNING - Can't get extra_info.page_faults counter from MongoDB"
+            sys.exit(1)
+
+        message = "Page Faults: %i" % (page_faults)
+
+        message += performance_data(perf_data, [(page_faults, "page_faults", warning, critical)])
+        check_levels(page_faults, warning, critical, message)
+
+    except Exception, e:
+        exit_with_general_critical(e)
+
+
+def chunks_balance(con, database, collection, warning, critical):
+    warning = warning or 10
+    critical = critical or 20
+    nsfilter = database + "." + collection
+    try:
+        try:
+            set_read_preference(con.admin)
+            col = con.config.chunks
+            nscount = col.find({"ns": nsfilter}).count()
+            shards = col.distinct("shard")
+
+        except:
+            print "WARNING - Can't get chunks infos from MongoDB"
+            sys.exit(1)
+
+        if nscount == 0:
+            print "WARNING - Namespace %s is not sharded" % (nsfilter)
+            sys.exit(1)
+
+        avgchunksnb = nscount / len(shards)
+        warningnb = avgchunksnb * warning / 100
+        criticalnb = avgchunksnb * critical / 100
+
+        for shard in shards:
+            delta = abs(avgchunksnb - col.find({"ns": nsfilter, "shard": shard}).count())
+            message = "Namespace: %s, Shard name: %s, Chunk delta: %i" % (nsfilter, shard, delta)
+
+            if delta >= criticalnb and delta > 0:
+                print "CRITICAL - Chunks not well balanced " + message
+                sys.exit(2)
+            elif delta >= warningnb  and delta > 0:
+                print "WARNING - Chunks not well balanced  " + message
+                sys.exit(1)
+
+        print "OK - Chunks well balanced across shards"
+        sys.exit(0)
+
+    except Exception, e:
+        exit_with_general_critical(e)
+
+    print "OK - Chunks well balanced across shards"
+    sys.exit(0)
+
+
+def check_connect_primary(con, warning, critical, perf_data):
+    warning = warning or 3
+    critical = critical or 6
+
+    try:
+        try:
+            set_read_preference(con.admin)
+            data = con.admin.command(pymongo.son_manipulator.SON([('isMaster', 1)]))
+        except:
+            data = con.admin.command(son.SON([('isMaster', 1)]))
+
+        if data['ismaster'] == True:
+            print "OK - This server is primary"
+            return 0
+
+        phost = data['primary'].split(':')[0]
+        pport = int(data['primary'].split(':')[1])
+        start = time.time()
+
+        err, con = mongo_connect(phost, pport)
+        if err != 0:
+            return err
+
+        pconn_time = time.time() - start
+        pconn_time = round(pconn_time, 0)
+        message = "Connection to primary server " + data['primary'] + " took %i seconds" % pconn_time
+        message += performance_data(perf_data, [(pconn_time, "connection_time", warning, critical)])
+
+        return check_levels(pconn_time, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_collection_state(con, database, collection):
+    try:
+        con[database][collection].find_one()
+        print "OK - Collection %s.%s is reachable " % (database, collection)
+        return 0
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def check_row_count(con, database, collection, warning, critical, perf_data):
+    try:
+        count = con[database][collection].count()
+        message = "Row count: %i" % (count)
+        message += performance_data(perf_data, [(count, "row_count", warning, critical)])
+
+        return check_levels(count, warning, critical, message)
+
+    except Exception, e:
+        return exit_with_general_critical(e)
+
+
+def build_file_name(host, port, action):
+    #done this way so it will work when run independently and from shell
+    module_name = re.match('(.*//*)*(.*)\..*', __file__).group(2)
+
+    if (port == 27017):
+        return "/tmp/" + module_name + "_data/" + host + "-" + action + ".data"
+    else:
+        return "/tmp/" + module_name + "_data/" + host + "-" + str(port) + "-" + action + ".data"
+
+
+def ensure_dir(f):
+    d = os.path.dirname(f)
+    if not os.path.exists(d):
+        os.makedirs(d)
+
+
+def write_values(file_name, string):
+    f = None
+    try:
+        f = open(file_name, 'w')
+    except IOError, e:
+        #try creating
+        if (e.errno == 2):
+            ensure_dir(file_name)
+            f = open(file_name, 'w')
+        else:
+            raise IOError(e)
+    f.write(string)
+    f.close()
+    return 0
+
+
+def read_values(file_name):
+    data = None
+    try:
+        f = open(file_name, 'r')
+        data = f.read()
+        f.close()
+        return 0, data
+    except IOError, e:
+        if (e.errno == 2):
+            #no previous data
+            return 1, ''
+    except Exception, e:
+        return 2, None
+
+
+def calc_delta(old, new):
+    delta = []
+    if (len(old) != len(new)):
+        raise Exception("unequal number of parameters")
+    for i in range(0, len(old)):
+        val = float(new[i]) - float(old[i])
+        if val < 0:
+            val = new[i]
+        delta.append(val)
+    return 0, delta
+
+
+def maintain_delta(new_vals, host, port, action):
+    file_name = build_file_name(host, port, action)
+    err, data = read_values(file_name)
+    old_vals = data.split(';')
+    new_vals = [str(int(time.time()))] + new_vals
+    delta = None
+    try:
+        err, delta = calc_delta(old_vals, new_vals)
+    except:
+        err = 2
+    write_res = write_values(file_name, ";" . join(str(x) for x in new_vals))
+    return err + write_res, delta
+
+
+def replication_get_time_diff(con):
+    col = 'oplog.rs'
+    local = con.local
+    ol = local.system.namespaces.find_one({"name": "local.oplog.$main"})
+    if ol:
+        col = 'oplog.$main'
+    firstc = local[col].find().sort("$natural", 1).limit(1)
+    lastc = local[col].find().sort("$natural", -1).limit(1)
+    first = firstc.next()
+    last = lastc.next()
+    tfirst = first["ts"]
+    tlast = last["ts"]
+    delta = tlast.time - tfirst.time
+    return delta
+
+#
+# main app
+#
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))