conntrack - Build the conntrack input plugin (tracks the number of entries in Linux's connection tracking table)
contextswitch - Build the contextswitch input plugin (collects the number of context switches done by the operating system)
cpu - Build the cpu input plugin (collects the amount of time spent by the CPU in various states)
cpufreq - Build the cpufreq input plugin (collects the current CPU's frequency)
cpusleep - Build the cpusleep input plugin (measures time spent by CPU in deep sleep mode)
csv - Build the csv output plugin (writes to comma separated values (CSV) files)
curl - Build the curl input plugin (reads streams using net-misc/curl and then parses them according to the configuration)
curl_json - Build the curl_json input plugin (queries JavaScript Object Notation (JSON) data using net-misc/curl and parses it according to the user's configuration using dev-libs/yajl)
curl_xml - Build the curl_xml input plugin (reads files using net-misc/curl and parses it as Extensible Markup Language (XML))
dbi - Build the dbi input plugin (executes SQL statements on databases and reads back the result)
df - Build the df input plugin (collects file system usage information, i. e. basically how much space on a mounted partition is used and how much is available)
disk - Build the disk input plugin (collects performance statistics of disks and, where supported, partitions)
dns - Build the dns input plugin (collects statistics of your DNS traffic on port udp/53 using net-libs/libpcap)
email - Build the email input plugin (opens a UNIX domain socket and starts accepting connections on that socket)
entropy - Build the entropy input plugin (collects the available entropy on a system)
ethstat - Build the ethstat input plugin (reads performance statistics directly from ethernet cards)
exec - Build the exec input/output plugin (executes scripts / applications and reads values back)
fhcount - Build the file handles input plugin (reports the number of used file handles)
filecount - Build the filecount input plugin (counts the number of files in a directory and all its subdirectories)
fscache - Build the fscache input plugin (collects information about the file-system based caching infrastructure for network file-systems and other slow media)
gps - Build the gps input plugin (collects number of satellites seen by a GPS receiver using sci-geosciences/gpsd)
md - Build the md input plugin (reports the number of disks in various states in Linux software RAID devices)
memcachec - Build the memcachec input plugin (queries one or more given pages from a memcached instance and parses the returned data according to user specification)
memcached - Build the memcached input plugin (collects statistics from memcached daemon)
modbus - Build the Modbus input plugin (reads register values from a Modbus "slave" via Modbus/TCP)
mqtt - Build the MQTT plugin (sends metrics to and/or receives metrics from an MQTT broker using app-misc/mosquitto)
multimeter - Build the multimeter input plugin (reads a voltage or current from a multimeter connected to a serial bus)
mysql - Build the mysql input plugin (collects values from 'SHOW STATUS' command of a MySQL server)
netlink - Build the netlink input plugin (collects statistics for interfaces, qdiscs, classes and filters using netlink socket)
network - Build the network input/output plugin (send values to other and/or receive values from from other collectd instances)
nfs - Build the nfs input plugin (collects information about the usage of the Network File System (NFS))
nginx - Build the nginx input plugin (collects number of requests handled and the number of current connections by connection state by the nginx daemon)
notify_desktop - Build the notify_desktop output plugin (uses x11-libs/libnotify to display notifications to the user)
notify_email - Build the notify_email output plugin (uses net-libs/libesmtp to send notifications to a configured email address)
notify_nagios - Build the notify_nagios output plugin (sends notifications to Nagios as a passive check result)
ntpd - Build the ntpd input plugin (collects statistics from a NTP server)
numa - Build the numa input plugin (collects statistics of the Linux Non-Uniform Memory Access (NUMA) subsystem)
nut - Build the nut input plugin (collects UPS statistics using the Network UPS Tools)
olsrd - Build the olsrd input plugin (reads information about the Optimized Link State Routing daemon)
onewire - Build the onewire (1-Wire) input plugin (collects temperature information from sensors)
openldap - Build the OpenLDAP input plugin (reads monitoring information from OpenLDAP's cn=Monitor subtree)
openvpn - Build the openvpn input plugin (reads the status file printed by OpenVPN)
oracle - Build the oracle input plugin (executes SQL statements against Oracle database systems)
processes - Build the processes input plugin (collects the number of processes, grouped by their state or detailed statistics about selected processes)
protocols - Build the protocols input plugin (collects information about the network protocols supported by the system)
python - Build the python language binding plugin (embeds a Python interpreter into collectd for writing plugins)
redis - Build the Redis input plugin (collects usage information from Redis instances)
routeros - Build the routeros input plugin (collects information from devices running RouterOS)
rrdcached - Build the rrdcached input/output plugin (connects to rrdcached and submits updates for RRD files)
rrdtool - Build the rrdtool output plugin (writes values to RRD-files)
sensors - Build the sensors input plugin (reads hardware sensors from lm-sensors)
serial - Build the serial input plugin (collects the traffic on serial interfaces)
sigrok - Build the sigrok input plugin (reads measurements from any supported hardware from sigrok project)
smart - Build the S.M.A.R.T input plugin (collects S.M.A.R.T statistics from disk drives)
snmp - Build the snmp input plugin (reads values from network devices using SNMP)
snmp_agent - Build an input plugin which implements an SNMP AgentX subagent that receives and handles queries from SNMP master agent and returns configured metrics
write_prometheus - Builds the Prometheus output plugin (starts an internal webserver on port 9103 (configurable) and accepts scrape requests from Prometheus)
write_tsdb - Build the TSDB output plugin (writes metrics to OpenTSDB, an open-source distributed time-series database based on Apache HBase)
xencpu - Build the XEN CPU input plugin (collects XEN Hypervisor CPU stats using app-emulation/xen-tools)
zfs_arc - Build the ZFS ARC input plugin (reports information such as the cache size, the various hits and misses (also as a ratio) and the transferred data)
zookeeper - Build the zookeeper input plugin (reads data from Apache Zookeeper MNTR command)