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README
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collectd - System information collection daemon
=================================================
https://collectd.org/
About
-----
collectd is a small daemon which collects system information periodically
and provides mechanisms to store and monitor the values in a variety of
ways.
Features
--------
* collectd is able to collect the following data:
- apache
Apache server utilization: Number of bytes transferred, number of
requests handled and detailed scoreboard statistics
- apcups
APC UPS Daemon: UPS charge, load, input/output/battery voltage, etc.
- apple_sensors
Sensors in Macs running Mac OS X / Darwin: Temperature, fan speed and
voltage sensors.
- aquaero
Various sensors in the Aquaero 5 water cooling board made by Aquacomputer.
- ascent
Statistics about Ascent, a free server for the game `World of Warcraft'.
- barometer
Reads absolute barometric pressure, air pressure reduced to sea level and
temperature. Supported sensors are MPL115A2 and MPL3115 from Freescale
and BMP085 from Bosch.
- battery
Batterycharge, -current and voltage of ACPI and PMU based laptop
batteries.
- bind
Name server and resolver statistics from the `statistics-channel'
interface of BIND 9.5, 9,6 and later.
- ceph
Statistics from the Ceph distributed storage system.
- cgroups
CPU accounting information for process groups under Linux.
- chrony
Chrony daemon statistics: Local clock drift, offset to peers, etc.
- conntrack
Number of nf_conntrack entries.
- contextswitch
Number of context switches done by the operating system.
- cpu
CPU utilization: Time spent in the system, user, nice, idle, and related
states.
- cpufreq
CPU frequency (For laptops with speed step or a similar technology)
- cpusleep
CPU sleep: Time spent in suspend (For mobile devices which enter suspend automatically)
- curl
Parse statistics from websites using regular expressions.
- curl_json
Retrieves JSON data via cURL and parses it according to user
configuration.
- curl_xml
Retrieves XML data via cURL and parses it according to user
configuration.
- dbi
Executes SQL statements on various databases and interprets the returned
data.
- df
Mountpoint usage (Basically the values `df(1)' delivers)
- disk
Disk utilization: Sectors read/written, number of read/write actions,
average time an IO-operation took to complete.
- dns
DNS traffic: Query types, response codes, opcodes and traffic/octets
transferred.
- dpdkstat
Collect DPDK interface statistics.
See docs/BUILD.dpdkstat.md for detailed build instructions.
This plugin should be compiled with compiler defenses enabled, for
example -fstack-protector.
- drbd
Collect individual drbd resource statistics.
- email
Email statistics: Count, traffic, spam scores and checks.
See collectd-email(5).
- entropy
Amount of entropy available to the system.
- ethstat
Network interface card statistics.
- exec
Values gathered by a custom program or script.
See collectd-exec(5).
- fhcount
File handles statistics.
- filecount
Count the number of files in directories.
- fscache
Linux file-system based caching framework statistics.
- gmond
Receive multicast traffic from Ganglia instances.
- gps
Monitor gps related data through gpsd.
- gpu_nvidia
Monitor NVIDIA GPU statistics available through NVML.
- hddtemp
Hard disk temperatures using hddtempd.
- hugepages
Report the number of used and free hugepages. More info on
hugepages can be found here:
https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt.
This plugin should be compiled with compiler defenses enabled, for
example -fstack-protector.
- intel_pmu
The intel_pmu plugin reads performance counters provided by the Linux
kernel perf interface. The plugin uses jevents library to resolve named
events to perf events and access perf interface.
- intel_rdt
The intel_rdt plugin collects information provided by monitoring features
of Intel Resource Director Technology (Intel(R) RDT) like Cache Monitoring
Technology (CMT), Memory Bandwidth Monitoring (MBM). These features
provide information about utilization of shared resources like last level
cache occupancy, local memory bandwidth usage, remote memory bandwidth
usage, instructions per clock.
<https://01.org/packet-processing/cache-monitoring-technology-memory-bandwidth-monitoring-cache-allocation-technology-code-and-data>
- interface
Interface traffic: Number of octets, packets and errors for each
interface.
- ipc
IPC counters: semaphores used, number of allocated segments in shared
memory and more.
- ipmi
IPMI (Intelligent Platform Management Interface) sensors information.
- iptables
Iptables' counters: Number of bytes that were matched by a certain
iptables rule.
- ipvs
IPVS connection statistics (number of connections, octets and packets
for each service and destination).
See http://www.linuxvirtualserver.org/software/index.html.
- irq
IRQ counters: Frequency in which certain interrupts occur.
- java
Integrates a `Java Virtual Machine' (JVM) to execute plugins in Java
bytecode.
See docs/BUILD.java.md for detailed build instructions.
- load
System load average over the last 1, 5 and 15 minutes.
- lpar
Detailed CPU statistics of the “Logical Partitions” virtualization
technique built into IBM's POWER processors.
- lua
The Lua plugin implements a Lua interpreter into collectd. This
makes it possible to write plugins in Lua which are executed by
collectd without the need to start a heavy interpreter every interval.
See collectd-lua(5) for details.
- lvm
Size of “Logical Volumes” (LV) and “Volume Groups” (VG) of Linux'
“Logical Volume Manager” (LVM).
- madwifi
Queries very detailed usage statistics from wireless LAN adapters and
interfaces that use the Atheros chipset and the MadWifi driver.
- mbmon
Motherboard sensors: temperature, fan speed and voltage information,
using mbmon(1).
- mcelog
Monitor machine check exceptions (hardware errors detected by hardware
and reported to software) reported by mcelog and generate appropriate
notifications when machine check exceptions are detected.
- md
Linux software-RAID device information (number of active, failed, spare
and missing disks).
- memcachec
Query and parse data from a memcache daemon (memcached).
- memcached
Statistics of the memcached distributed caching system.
<http://www.danga.com/memcached/>
- memory
Memory utilization: Memory occupied by running processes, page cache,
buffer cache and free.
- mic
Collects CPU usage, memory usage, temperatures and power consumption from
Intel Many Integrated Core (MIC) CPUs.
- modbus
Reads values from Modbus/TCP enabled devices. Supports reading values
from multiple "slaves" so gateway devices can be used.
- multimeter
Information provided by serial multimeters, such as the `Metex
M-4650CR'.
- mysql
MySQL server statistics: Commands issued, handlers triggered, thread
usage, query cache utilization and traffic/octets sent and received.
- netapp
Plugin to query performance values from a NetApp storage system using the
“Manage ONTAP” SDK provided by NetApp.
- netlink
Very detailed Linux network interface and routing statistics. You can get
(detailed) information on interfaces, qdiscs, classes, and, if you can
make use of it, filters.
- network
Receive values that were collected by other hosts. Large setups will
want to collect the data on one dedicated machine, and this is the
plugin of choice for that.
- nfs
NFS Procedures: Which NFS command were called how often.
- nginx
Collects statistics from `nginx' (speak: engine X), a HTTP and mail
server/proxy.
- ntpd
NTP daemon statistics: Local clock drift, offset to peers, etc.
- numa
Information about Non-Uniform Memory Access (NUMA).
- nut
Network UPS tools: UPS current, voltage, power, charge, utilisation,
temperature, etc. See upsd(8).
- olsrd
Queries routing information from the “Optimized Link State Routing”
daemon.
- onewire (EXPERIMENTAL!)
Read onewire sensors using the owcapu library of the owfs project.
Please read in collectd.conf(5) why this plugin is experimental.
- openldap
Read monitoring information from OpenLDAP's cn=Monitor subtree.
- openvpn
RX and TX of each client in openvpn-status.log (status-version 2).
<http://openvpn.net/index.php/documentation/howto.html>
- oracle
Query data from an Oracle database.
- ovs_events
The plugin monitors the link status of Open vSwitch (OVS) connected
interfaces, dispatches the values to collectd and sends the notification
whenever the link state change occurs in the OVS database. It requires
YAJL library to be installed.
Detailed instructions for installing and setting up Open vSwitch, see
OVS documentation.
<http://openvswitch.org/support/dist-docs/INSTALL.rst.html>
- ovs_stats
The plugin collects the statistics of OVS connected bridges and
interfaces. It requires YAJL library to be installed.
Detailed instructions for installing and setting up Open vSwitch, see
OVS documentation.
<http://openvswitch.org/support/dist-docs/INSTALL.rst.html>
- pcie_errors
Read errors from PCI Express Device Status and AER extended capabilities.
<https://www.design-reuse.com/articles/38374/pcie-error-logging-and-handling-on-a-typical-soc.html>
- perl
The perl plugin implements a Perl-interpreter into collectd. You can
write your own plugins in Perl and return arbitrary values using this
API. See collectd-perl(5).
- pf
Query statistics from BSD's packet filter "pf".
- pinba
Receive and dispatch timing values from Pinba, a profiling extension for
PHP.
- ping
Network latency: Time to reach the default gateway or another given
host.
- postgresql
PostgreSQL database statistics: active server connections, transaction
numbers, block IO, table row manipulations.
- powerdns
PowerDNS name server statistics.
- processes
Process counts: Number of running, sleeping, zombie, ... processes.
- protocols
Counts various aspects of network protocols such as IP, TCP, UDP, etc.
- python
The python plugin implements a Python interpreter into collectd. This
makes it possible to write plugins in Python which are executed by
collectd without the need to start a heavy interpreter every interval.
See collectd-python(5) for details.
- redis
The redis plugin gathers information from a Redis server, including:
uptime, used memory, total connections etc.
- routeros
Query interface and wireless registration statistics from RouterOS.
- rrdcached
RRDtool caching daemon (RRDcacheD) statistics.
- sensors
System sensors, accessed using lm_sensors: Voltages, temperatures and
fan rotation speeds.
- serial
RX and TX of serial interfaces. Linux only; needs root privileges.
- sigrok
Uses libsigrok as a backend, allowing any sigrok-supported device
to have its measurements fed to collectd. This includes multimeters,
sound level meters, thermometers, and much more.
- smart
Collect SMART statistics, notably load cycle count, temperature
and bad sectors.
- snmp
Read values from SNMP (Simple Network Management Protocol) enabled
network devices such as switches, routers, thermometers, rack monitoring
servers, etc. See collectd-snmp(5).
- statsd
Acts as a StatsD server, reading values sent over the network from StatsD
clients and calculating rates and other aggregates out of these values.
- swap
Pages swapped out onto hard disk or whatever is called `swap' by the OS..
- table
Parse table-like structured files.
- tail
Follows (tails) log files, parses them by lines and submits matched
values.
- tail_csv
Follows (tails) files in CSV format, parses each line and submits
extracted values.
- tape
Bytes and operations read and written on tape devices. Solaris only.
- tcpconns
Number of TCP connections to specific local and remote ports.
- teamspeak2
TeamSpeak2 server statistics.
- ted
Plugin to read values from `The Energy Detective' (TED).
- thermal
Linux ACPI thermal zone information.
- tokyotyrant
Reads the number of records and file size from a running Tokyo Tyrant
server.
- turbostat
Reads CPU frequency and C-state residency on modern Intel
turbo-capable processors.
- uptime
System uptime statistics.
- users
Users currently logged in.
- varnish
Various statistics from Varnish, an HTTP accelerator.
- virt
CPU, memory, disk and network I/O statistics from virtual machines.
- vmem
Virtual memory statistics, e.g. the number of page-ins/-outs or the
number of pagefaults.
- vserver
System resources used by Linux VServers.
See <http://linux-vserver.org/>.
- wireless
Link quality of wireless cards. Linux only.
- xencpu
XEN Hypervisor CPU stats.
- xmms
Bitrate and frequency of music played with XMMS.
- zfs_arc
Statistics for ZFS' “Adaptive Replacement Cache” (ARC).
- zone
Measures the percentage of cpu load per container (zone) under Solaris 10
and higher
- zookeeper
Read data from Zookeeper's MNTR command.
* Output can be written or sent to various destinations by the following
plugins:
- amqp
Sends JSON-encoded data to an Advanced Message Queuing Protocol (AMQP)
0.9.1 server, such as RabbitMQ.
- amqp1
Sends JSON-encoded data to an Advanced Message Queuing Protocol (AMQP)
1.0 server, such as Qpid Dispatch Router or Apache Artemis Broker.
- csv
Write to comma separated values (CSV) files. This needs lots of
diskspace but is extremely portable and can be analysed with almost
every program that can analyse anything. Even Microsoft's Excel..
- grpc
Send and receive values over the network using the gRPC framework.
- lua
It's possible to implement write plugins in Lua using the Lua
plugin. See collectd-lua(5) for details.
- mqtt
Publishes and subscribes to MQTT topics.
- network
Send the data to a remote host to save the data somehow. This is useful
for large setups where the data should be saved by a dedicated machine.
- perl
Of course the values are propagated to plugins written in Perl, too, so
you can easily do weird stuff with the plugins we didn't dare think of
;) See collectd-perl(5).
- python
It's possible to implement write plugins in Python using the python
plugin. See collectd-python(5) for details.
- rrdcached
Output to round-robin-database (RRD) files using the RRDtool caching
daemon (RRDcacheD) - see rrdcached(1). That daemon provides a general
implementation of the caching done by the `rrdtool' plugin.
- rrdtool
Output to round-robin-database (RRD) files using librrd. See rrdtool(1).
This is likely the most popular destination for such values. Since
updates to RRD-files are somewhat expensive this plugin can cache
updates to the files and write a bunch of updates at once, which lessens
system load a lot.
- snmp_agent
Receives and handles queries from SNMP master agent and returns the data
collected by read plugins. Handles requests only for OIDs specified in
configuration file. To handle SNMP queries the plugin gets data from
collectd and translates requested values from collectd's internal format
to SNMP format.
- unixsock
One can query the values from the unixsock plugin whenever they're
needed. Please read collectd-unixsock(5) for a description on how that's
done.
- write_graphite
Sends data to Carbon, the storage layer of Graphite using TCP or UDP. It
can be configured to avoid logging send errors (especially useful when
using UDP).
- write_http
Sends the values collected by collectd to a web-server using HTTP POST
requests. The transmitted data is either in a form understood by the
Exec plugin or formatted in JSON.
- write_kafka
Sends data to Apache Kafka, a distributed queue.
- write_log
Writes data to the log
- write_mongodb
Sends data to MongoDB, a NoSQL database.
- write_prometheus
Publish values using an embedded HTTP server, in a format compatible
with Prometheus' collectd_exporter.
- write_redis
Sends the values to a Redis key-value database server.
- write_riemann
Sends data to Riemann, a stream processing and monitoring system.
- write_sensu
Sends data to Sensu, a stream processing and monitoring system, via the
Sensu client local TCP socket.
- write_syslog
Sends data in syslog format, using TCP, where the message
contains the metric in human or JSON format.
- write_tsdb
Sends data OpenTSDB, a scalable no master, no shared state time series
database.
* Logging is, as everything in collectd, provided by plugins. The following
plugins keep us informed about what's going on:
- logfile
Writes log messages to a file or STDOUT/STDERR.
- perl
Log messages are propagated to plugins written in Perl as well.
See collectd-perl(5).
- python
It's possible to implement log plugins in Python using the python plugin.
See collectd-python(5) for details.
- syslog
Logs to the standard UNIX logging mechanism, syslog.
- log_logstash
Writes log messages formatted as logstash JSON events.
* Notifications can be handled by the following plugins:
- notify_desktop
Send a desktop notification to a notification daemon, as defined in
the Desktop Notification Specification. To actually display the
notifications, notification-daemon is required.
See http://www.galago-project.org/specs/notification/.
- notify_email
Send an E-mail with the notification message to the configured
recipients.
- notify_nagios
Submit notifications as passive check results to a local nagios instance.
- exec
Execute a program or script to handle the notification.
See collectd-exec(5).
- logfile
Writes the notification message to a file or STDOUT/STDERR.
- network
Send the notification to a remote host to handle it somehow.
- perl
Notifications are propagated to plugins written in Perl as well.
See collectd-perl(5).
- python
It's possible to implement notification plugins in Python using the
python plugin. See collectd-python(5) for details.
* Value processing can be controlled using the "filter chain" infrastructure
and "matches" and "targets". The following plugins are available:
- match_empty_counter
Match counter values which are currently zero.
- match_hashed
Match values using a hash function of the hostname.
- match_regex
Match values by their identifier based on regular expressions.
- match_timediff
Match values with an invalid timestamp.
- match_value
Select values by their data sources' values.
- target_notification
Create and dispatch a notification.
- target_replace
Replace parts of an identifier using regular expressions.
- target_scale
Scale (multiply) values by an arbitrary value.
- target_set
Set (overwrite) entire parts of an identifier.
* Miscellaneous plugins:
- aggregation
Selects multiple value lists based on patterns or regular expressions
and creates new aggregated values lists from those.
- threshold
Checks values against configured thresholds and creates notifications if
values are out of bounds. See collectd-threshold(5) for details.
- uuid
Sets the hostname to a unique identifier. This is meant for setups
where each client may migrate to another physical host, possibly going
through one or more name changes in the process.
* Performance: Since collectd is running as a daemon it doesn't spend much
time starting up again and again. With the exception of the exec plugin no
processes are forked. Caching in output plugins, such as the rrdtool and
network plugins, makes sure your resources are used efficiently. Also,
since collectd is programmed multithreaded it benefits from hyper-threading
and multicore processors and makes sure that the daemon isn't idle if only
one plugin waits for an IO-operation to complete.
* Once set up, hardly any maintenance is necessary. Setup is kept as easy
as possible and the default values should be okay for most users.
Operation
---------
* collectd's configuration file can be found at `sysconfdir'/collectd.conf.
Run `collectd -h' for a list of built-in defaults. See `collectd.conf(5)'
for a list of options and a syntax description.
* When the `csv' or `rrdtool' plugins are loaded they'll write the values to
files. The usual place for these files is beneath `/var/lib/collectd'.
* When using some of the plugins, collectd needs to run as user root, since
only root can do certain things, such as craft ICMP packages needed to ping
other hosts. collectd should NOT be installed setuid root since it can be
used to overwrite valuable files!
* Sample scripts to generate graphs reside in `contrib/' in the source
package or somewhere near `/usr/share/doc/collectd' in most distributions.
Please be aware that those script are meant as a starting point for your
own experiments.. Some of them require the `RRDs' Perl module.
(`librrds-perl' on Debian) If you have written a more sophisticated
solution please share it with us.
* The RRAs of the automatically created RRD files depend on the `step'
and `heartbeat' settings given. If change these settings you may need to
re-create the files, losing all data. Please be aware of that when changing
the values and read the rrdtool(1) manpage thoroughly.
collectd and chkrootkit
-----------------------
If you are using the `dns' plugin chkrootkit(1) will report collectd as a
packet sniffer ("<iface>: PACKET SNIFFER(/usr/sbin/collectd[<pid>])"). The
plugin captures all UDP packets on port 53 to analyze the DNS traffic. In
this case, collectd is a legitimate sniffer and the report should be
considered to be a false positive. However, you might want to check that
this really is collectd and not some other, illegitimate sniffer.
Prerequisites
-------------
To compile collectd from source you will need:
* Usual suspects: C compiler, linker, preprocessor, make, ...
collectd makes use of some common C99 features, e.g. compound literals and
mixed declarations, and therefore requires a C99 compatible compiler.
On Debian and Ubuntu, the "build-essential" package should pull in
everything that's necessary.
* A POSIX-threads (pthread) implementation.
Since gathering some statistics is slow (network connections, slow devices,
etc) collectd is parallelized. The POSIX threads interface is being
used and should be found in various implementations for hopefully all
platforms.
* When building from the Git repository, flex (tokenizer) and bison (parser
generator) are required. Release tarballs include the generated files – you
don't need these packages in that case.
* aerotools-ng (optional)
Used by the `aquaero' plugin. Currently, the `libaquaero5' library, which
is used by the `aerotools-ng' toolkit, is not compiled as a shared object
nor does it feature an installation routine. Therefore, you need to point
collectd's configure script at the source directory of the `aerotools-ng'
project.
<https://github.com/lynix/aerotools-ng>
* CoreFoundation.framework and IOKit.framework (optional)
For compiling on Darwin in general and the `apple_sensors' plugin in
particular.
<http://developer.apple.com/corefoundation/>
* CUDA (optional)
Used by the `gpu_nvidia' plugin
<https://developer.nvidia.com/cuda-downloads>
* libatasmart (optional)
Used by the `smart' plugin.
<http://git.0pointer.de/?p=libatasmart.git>
* libcap (optional)
The `turbostat' plugin can optionally build Linux Capabilities support,
which avoids full privileges requirement (aka. running as root) to read
values.
<http://sites.google.com/site/fullycapable/>
* libclntsh (optional)
Used by the `oracle' plugin.
* libhiredis (optional)
Used by the redis plugin. Please note that you require a 0.10.0 version
or higher. <https://github.com/redis/hiredis>
* libcurl (optional)
If you want to use the `apache', `ascent', `bind', `curl', `curl_json',
`curl_xml', `nginx', or `write_http' plugin.
<http://curl.haxx.se/>
* libdbi (optional)
Used by the `dbi' plugin to connect to various databases.
<http://libdbi.sourceforge.net/>
* libesmtp (optional)
For the `notify_email' plugin.
<http://www.stafford.uklinux.net/libesmtp/>
* libganglia (optional)
Used by the `gmond' plugin to process data received from Ganglia.
<http://ganglia.info/>
* libgrpc (optional)
Used by the `grpc' plugin. gRPC requires a C++ compiler supporting the
C++11 standard.
<https://grpc.io/>
* libgcrypt (optional)
Used by the `network' plugin for encryption and authentication.
<http://www.gnupg.org/>
* libgps (optional)
Used by the `gps' plugin.
<http://developer.berlios.de/projects/gpsd/>
* libi2c-dev (optional)
Used for the plugin `barometer', provides just the i2c-dev.h header file
for user space i2c development.
* libiptc (optional)
For querying iptables counters.
<http://netfilter.org/>
* libjevents (optional)
The jevents library is used by the `intel_pmu' plugin to access the Linux
kernel perf interface.
Note: the library should be build with -fPIC flag to be linked with
intel_pmu shared object correctly.
<https://github.com/andikleen/pmu-tools>
* libjvm (optional)
Library that encapsulates the `Java Virtual Machine' (JVM). This library is
used by the `java' plugin to execute Java bytecode.
See docs/BUILD.java.md for detailed build instructions.
<http://openjdk.java.net/> (and others)
* libldap (optional)
Used by the `openldap' plugin.
<http://www.openldap.org/>
* liblua (optional)
Used by the `lua' plugin. Currently, Lua 5.1 and later are supported.
<https://www.lua.org/>
* liblvm2 (optional)
Used by the `lvm' plugin.
<ftp://sources.redhat.com/pub/lvm2/>
* libmemcached (optional)
Used by the `memcachec' plugin to connect to a memcache daemon.
<http://tangent.org/552/libmemcached.html>
* libmicrohttpd (optional)
Used by the write_prometheus plugin to run an http daemon.
<http://www.gnu.org/software/libmicrohttpd/>
* libmnl (optional)
Used by the `netlink' plugin.
<http://www.netfilter.org/projects/libmnl/>
* libmodbus (optional)
Used by the `modbus' plugin to communicate with Modbus/TCP devices. The
`modbus' plugin works with version 2.0.3 of the library – due to frequent
API changes other versions may or may not compile cleanly.
<http://www.libmodbus.org/>
* libmysqlclient (optional)
Unsurprisingly used by the `mysql' plugin.
<http://dev.mysql.com/>
* libnetapp (optional)
Required for the `netapp' plugin.
This library is part of the “Manage ONTAP SDK” published by NetApp.
* libnetsnmp (optional)
For the `snmp' and 'snmp_agent' plugins.
<http://www.net-snmp.org/>
* libnetsnmpagent (optional)
Required for the 'snmp_agent' plugin.
<http://www.net-snmp.org/>
* libnotify (optional)
For the `notify_desktop' plugin.
<http://www.galago-project.org/>
* libopenipmi (optional)
Used by the `ipmi' plugin to prove IPMI devices.
<http://openipmi.sourceforge.net/>
* liboping (optional)
Used by the `ping' plugin to send and receive ICMP packets.
<http://octo.it/liboping/>
* libowcapi (optional)
Used by the `onewire' plugin to read values from onewire sensors (or the
owserver(1) daemon).
<http://www.owfs.org/>
* libpcap (optional)
Used to capture packets by the `dns' plugin.
<http://www.tcpdump.org/>
* libperfstat (optional)
Used by various plugins to gather statistics under AIX.
* libperl (optional)
Obviously used by the `perl' plugin. The library has to be compiled with
ithread support (introduced in Perl 5.6.0).
<http://www.perl.org/>
* libpq (optional)
The PostgreSQL C client library used by the `postgresql' plugin.
<http://www.postgresql.org/>
* libpqos (optional)
The PQoS library for Intel(R) Resource Director Technology used by the
`intel_rdt' plugin.
<https://github.com/01org/intel-cmt-cat>
* libprotobuf, protoc 3.0+ (optional)
Used by the `grpc' plugin to generate service stubs and code to handle
network packets of collectd's protobuf-based network protocol.
<https://developers.google.com/protocol-buffers/>
* libprotobuf-c, protoc-c (optional)
Used by the `pinba' plugin to generate a parser for the network packets
sent by the Pinba PHP extension.
<http://code.google.com/p/protobuf-c/>
* libpython (optional)
Used by the `python' plugin. Currently, Python 2.6 and later and Python 3
are supported.
<http://www.python.org/>
* libqpid-proton (optional)
Used by the `amqp1' plugin for AMQP 1.0 connections, for example to
Qdrouterd.
<http://qpid.apache.org/>
* librabbitmq (optional; also called “rabbitmq-c”)
Used by the `amqp' plugin for AMQP 0.9.1 connections, for example to
RabbitMQ.
<http://hg.rabbitmq.com/rabbitmq-c/>
* librdkafka (optional; also called “rdkafka”)
Used by the `write_kafka' plugin for producing messages and sending them
to a Kafka broker.
<https://github.com/edenhill/librdkafka>
* librouteros (optional)
Used by the `routeros' plugin to connect to a device running `RouterOS'.
<http://octo.it/librouteros/>
* librrd (optional)
Used by the `rrdtool' and `rrdcached' plugins. The latter requires RRDtool
client support which was added after version 1.3 of RRDtool. Versions 1.0,
1.2 and 1.3 are known to work with the `rrdtool' plugin.
<http://oss.oetiker.ch/rrdtool/>
* librt, libsocket, libkstat, libdevinfo (optional)
Various standard Solaris libraries which provide system functions.
<http://developers.sun.com/solaris/>
* libsensors (optional)
To read from `lm_sensors', see the `sensors' plugin.
<http://www.lm-sensors.org/>
* libsigrok (optional)
Used by the `sigrok' plugin. In addition, libsigrok depends on glib,
libzip, and optionally (depending on which drivers are enabled) on
libusb, libftdi and libudev.
* libstatgrab (optional)
Used by various plugins to collect statistics on systems other than Linux
and/or Solaris.
<http://www.i-scream.org/libstatgrab/>
* libtokyotyrant (optional)
Used by the `tokyotyrant' plugin.
<http://1978th.net/tokyotyrant/>
* libupsclient/nut (optional)
For the `nut' plugin which queries nut's `upsd'.
<http://networkupstools.org/>
* libvirt (optional)
Collect statistics from virtual machines.
<http://libvirt.org/>
* libxml2 (optional)
Parse XML data. This is needed for the `ascent', `bind', `curl_xml' and
`virt' plugins.
<http://xmlsoft.org/>
* libxen (optional)
Used by the `xencpu' plugin.
<http://xenbits.xensource.com/>
* libxmms (optional)
<http://www.xmms.org/>
* libyajl (optional)
Parse JSON data. This is needed for the `ceph', `curl_json', 'ovs_events',
'ovs_stats' and `log_logstash' plugins.
<http://github.com/lloyd/yajl>