+=encoding UTF-8
+
=head1 NAME
collectd.conf - Configuration for the system statistics collection daemon B<collectd>
=item B<LoadPlugin> I<Plugin>
-Loads the plugin I<Plugin>. There must be at least one such line or B<collectd>
-will be mostly useless.
+Loads the plugin I<Plugin>. This is required to load plugins, unless the
+B<AutoLoadPlugin> option is enabled (see below). Without any loaded plugins,
+I<collectd> will be mostly useless.
-Starting with collectd 4.9, this may also be a block in which further options
-affecting the behavior of B<LoadPlugin> may be specified. The following
-options are allowed inside a B<LoadPlugin> block:
+Only the first B<LoadPlugin> statement or block for a given plugin name has any
+effect. This is useful when you want to split up the configuration into smaller
+files and want each file to be "self contained", i.e. it contains a B<Plugin>
+block I<and> then appropriate B<LoadPlugin> statement. The downside is that if
+you have multiple conflicting B<LoadPlugin> blocks, e.g. when they specify
+different intervals, only one of them (the first one encountered) will take
+effect and all others will be silently ignored.
- <LoadPlugin perl>
- Globals true
- Interval 10
- </LoadPlugin>
+B<LoadPlugin> may either be a simple configuration I<statement> or a I<block>
+with additional options, affecting the behavior of B<LoadPlugin>. A simple
+statement looks like this:
+
+ LoadPlugin "cpu"
+
+Options inside a B<LoadPlugin> block can override default settings and
+influence the way plugins are loaded, e.g.:
+
+ <LoadPlugin perl>
+ Globals true
+ Interval 60
+ </LoadPlugin>
+
+The following options are valid inside B<LoadPlugin> blocks:
=over 4
=back
+=item B<AutoLoadPlugin> B<false>|B<true>
+
+When set to B<false> (the default), each plugin needs to be loaded explicitly,
+using the B<LoadPlugin> statement documented above. If a
+B<E<lt>PluginE<nbsp>...E<gt>> block is encountered and no configuration
+handling callback for this plugin has been registered, a warning is logged and
+the block is ignored.
+
+When set to B<true>, explicit B<LoadPlugin> statements are not required. Each
+B<E<lt>PluginE<nbsp>...E<gt>> block acts as if it was immediately preceded by a
+B<LoadPlugin> statement. B<LoadPlugin> statements are still required for
+plugins that don't provide any configuration, e.g. the I<Load plugin>.
+
=item B<Include> I<Path> [I<pattern>]
If I<Path> points to a file, includes that file. If I<Path> points to a
Include "/etc/collectd.d/*.conf"
+Starting with version 5.3, this may also be a block in which further options
+affecting the behavior of B<Include> may be specified. The following option is
+currently allowed:
+
+ <Include "/etc/collectd.d">
+ Filter "*.conf"
+ </Include>
+
+=over 4
+
+=item B<Filter> I<pattern>
+
If the C<fnmatch> function is available on your system, a shell-like wildcard
I<pattern> may be specified to filter which files to include. This may be used
in combination with recursively including a directory to easily be able to
arbitrarily mix configuration files and other documents (e.g. README files).
-The following statement is similar to the example above but includes all files
+The given example is similar to the first example above but includes all files
matching C<*.conf> in any subdirectory of C</etc/collectd.d>:
Include "/etc/collectd.d" "*.conf"
+=back
+
If more than one files are included by a single B<Include> option, the files
will be included in lexicographical order (as defined by the C<strcmp>
function). Thus, you can e.E<nbsp>g. use numbered prefixes to specify the
Number of threads to start for reading plugins. The default value is B<5>, but
you may want to increase this if you have more than five plugins that take a
-long time to read. Mostly those are plugin that do network-IO. Setting this to
-a value higher than the number of plugins you've loaded is totally useless.
+long time to read. Mostly those are plugins that do network-IO. Setting this to
+a value higher than the number of registered read callbacks is not recommended.
+
+=item B<WriteThreads> I<Num>
+
+Number of threads to start for dispatching value lists to write plugins. The
+default value is B<5>, but you may want to increase this if you have more than
+five plugins that may take relatively long to write to.
+
+=item B<WriteQueueLimitHigh> I<HighNum>
+
+=item B<WriteQueueLimitLow> I<LowNum>
+
+Metrics are read by the I<read threads> and then put into a queue to be handled
+by the I<write threads>. If one of the I<write plugins> is slow (e.g. network
+timeouts, I/O saturation of the disk) this queue will grow. In order to avoid
+running into memory issues in such a case, you can limit the size of this
+queue.
+
+By default, there is no limit and memory may grow indefinitely. This is most
+likely not an issue for clients, i.e. instances that only handle the local
+metrics. For servers it is recommended to set this to a non-zero value, though.
+
+You can set the limits using B<WriteQueueLimitHigh> and B<WriteQueueLimitLow>.
+Each of them takes a numerical argument which is the number of metrics in the
+queue. If there are I<HighNum> metrics in the queue, any new metrics I<will> be
+dropped. If there are less than I<LowNum> metrics in the queue, all new metrics
+I<will> be enqueued. If the number of metrics currently in the queue is between
+I<LowNum> and I<HighNum>, the metric is dropped with a probability that is
+proportional to the number of metrics in the queue (i.e. it increases linearly
+until it reaches 100%.)
+
+If B<WriteQueueLimitHigh> is set to non-zero and B<WriteQueueLimitLow> is
+unset, the latter will default to half of B<WriteQueueLimitHigh>.
+
+If you do not want to randomly drop values when the queue size is between
+I<LowNum> and I<HighNum>, set If B<WriteQueueLimitHigh> and
+B<WriteQueueLimitLow> to same value.
=item B<Hostname> I<Name>
default), the I<transient> delivery mode will be used, i.e. messages may be
lost due to high load, overflowing queues or similar issues.
-=item B<Format> B<Command>|B<JSON> (Publish only)
+=item B<Format> B<Command>|B<JSON>|B<Graphite> (Publish only)
Selects the format in which messages are sent to the broker. If set to
B<Command> (the default), values are sent as C<PUTVAL> commands which are
=back
+=head2 Plugin C<aquaero>
+
+This plugin collects the value of the available sensors in an
+I<AquaeroE<nbsp>5> board. AquaeroE<nbsp>5 is a water-cooling controller board,
+manufactured by Aqua Computer GmbH L<http://www.aquacomputer.de/>, with a USB2
+connection for monitoring and configuration. The board can handle multiple
+temperature sensors, fans, water pumps and water level sensors and adjust the
+output settings such as fan voltage or power used by the water pump based on
+the available inputs using a configurable controller included in the board.
+This plugin collects all the available inputs as well as some of the output
+values chosen by this controller. The plugin is based on the I<libaquaero5>
+library provided by I<aquatools-ng>.
+
+=over 4
+
+=item B<Device> I<DevicePath>
+
+Device path of the AquaeroE<nbsp>5's USB HID (human interface device), usually
+in the form C</dev/usb/hiddevX>. If this option is no set the plugin will try
+to auto-detect the Aquaero 5 USB device based on vendor-ID and product-ID.
+
+=back
+
=head2 Plugin C<ascent>
This plugin collects information about an Ascent server, a free server for the
=back
+=head2 Plugin C<cgroups>
+
+This plugin collects the CPU user/system time for each I<cgroup> by reading the
+F<cpuacct.stat> files in the first cpuacct-mountpoint (typically
+F</sys/fs/cgroup/cpu.cpuacct> on machines using systemd).
+
+=over 4
+
+=item B<CGroup> I<Directory>
+
+Select I<cgroup> based on the name. Whether only matching I<cgroups> are
+collected or if they are ignored is controlled by the B<IgnoreSelected> option;
+see below.
+
+=item B<IgnoreSelected> B<true>|B<false>
+
+Invert the selection: If set to true, all cgroups I<except> the ones that
+match any one of the criteria are collected. By default only selected
+cgroups are collected if a selection is made. If no selection is configured
+at all, B<all> cgroups are selected.
+
+=back
+
=head2 Plugin C<cpufreq>
This plugin doesn't have any options. It reads
possibly need this option. What CA certificates come bundled with C<libcurl>
and are checked by default depends on the distribution you use.
+=item B<Header> I<Header>
+
+A HTTP header to add to the request. Multiple headers are added if this option
+is specified more than once.
+
+=item B<Post> I<Body>
+
+Specifies that the HTTP operation should be a POST instead of a GET. The
+complete data to be posted is given as the argument. This option will usually
+need to be accompanied by a B<Header> option to set an appropriate
+C<Content-Type> for the post body (e.g. to
+C<application/x-www-form-urlencoded>).
+
=item B<MeasureResponseTime> B<true>|B<false>
Measure response time for the request. If this setting is enabled, B<Match>
=head2 Plugin C<curl_json>
-The B<curl_json plugin> uses B<libcurl> (L<http://curl.haxx.se/>) and
-B<libyajl> (L<http://www.lloydforge.org/projects/yajl/>) to retrieve JSON data
-via cURL. This can be used to collect values from CouchDB documents (which are
-stored JSON notation), for example.
+The B<curl_json plugin> collects values from JSON data to be parsed by
+B<libyajl> (L<http://www.lloydforge.org/projects/yajl/>) retrieved via
+either B<libcurl> (L<http://curl.haxx.se/>) or read directly from a
+unix socket. The former can be used, for example, to collect values
+from CouchDB documents (which are stored JSON notation), and the
+latter to collect values from a uWSGI stats socket.
-The following example will collect several values from the built-in `_stats'
-runtime statistics module of CouchDB
+The following example will collect several values from the built-in
+C<_stats> runtime statistics module of I<CouchDB>
(L<http://wiki.apache.org/couchdb/Runtime_Statistics>).
<Plugin curl_json>
</URL>
</Plugin>
-In the B<Plugin> block, there may be one or more B<URL> blocks, each defining
-a URL to be fetched via HTTP (using libcurl) and one or more B<Key> blocks.
-The B<Key> string argument must be in a path format, which is used to collect a
-value from a JSON map object. If a path element of B<Key> is the
-I<*>E<nbsp>wildcard, the values for all keys will be collectd.
+This example will collect data directly from a I<uWSGI> "Stats Server" socket.
+
+ <Plugin curl_json>
+ <Sock "/var/run/uwsgi.stats.sock">
+ Instance "uwsgi"
+ <Key "workers/*/requests">
+ Type "http_requests"
+ </Key>
+
+ <Key "workers/*/apps/*/requests">
+ Type "http_requests"
+ </Key>
+ </Sock>
+ </Plugin>
+
+In the B<Plugin> block, there may be one or more B<URL> blocks, each
+defining a URL to be fetched via HTTP (using libcurl) or B<Sock>
+blocks defining a unix socket to read JSON from directly. Each of
+these blocks may have one or more B<Key> blocks.
+
+The B<Key> string argument must be in a path format. Each component is
+used to match the key from a JSON map or the index of an JSON
+array. If a path component of a B<Key> is a I<*>E<nbsp>wildcard, the
+values for all map keys or array indices will be collectd.
The following options are valid within B<URL> blocks:
Sets the plugin instance to I<Instance>.
=item B<User> I<Name>
-
-Username to use if authorization is required to read the page.
-
=item B<Password> I<Password>
-
-Password to use if authorization is required to read the page.
-
=item B<VerifyPeer> B<true>|B<false>
-
-Enable or disable peer SSL certificate verification. See
-L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
-
=item B<VerifyHost> B<true>|B<false>
-
-Enable or disable peer host name verification. If enabled, the plugin checks if
-the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
-matches the host name provided by the B<URL> option. If this identity check
-fails, the connection is aborted. Obviously, only works when connecting to a
-SSL enabled server. Enabled by default.
-
=item B<CACert> I<file>
+=item B<Header> I<Header>
+=item B<Post> I<Body>
-File that holds one or more SSL certificates. If you want to use HTTPS you will
-possibly need this option. What CA certificates come bundled with C<libcurl>
-and are checked by default depends on the distribution you use.
+These options behave exactly equivalent to the appropriate options of the
+I<cURL> plugin. Please see there for a detailed description.
=back
Use I<Instance> as the plugin instance when submitting values. Defaults to an
empty string (no plugin instance).
+=item B<Namespace> I<Prefix> I<URL>
+
+If an XPath expression references namespaces, they must be specified
+with this option. I<Prefix> is the "namespace prefix" used in the XML document.
+I<URL> is the "namespace name", an URI reference uniquely identifying the
+namespace. The option can be repeated to register multiple namespaces.
+
+Examples:
+
+ Namespace "s" "http://schemas.xmlsoap.org/soap/envelope/"
+ Namespace "m" "http://www.w3.org/1998/Math/MathML"
+
=item B<User> I<User>
+
=item B<Password> I<Password>
+
=item B<VerifyPeer> B<true>|B<false>
+
=item B<VerifyHost> B<true>|B<false>
+
=item B<CACert> I<CA Cert File>
+=item B<Header> I<Header>
+
+=item B<Post> I<Body>
+
These options behave exactly equivalent to the appropriate options of the
-I<cURL> and I<cURL-JSON> plugins. Please see there for a detailed description.
+I<cURL plugin>. Please see there for a detailed description.
=item E<lt>B<XPath> I<XPath-expression>E<gt>
L<http://libdbi-drivers.sourceforge.net/>. However, the options "host",
"username", "password", and "dbname" seem to be deE<nbsp>facto standards.
+DBDs can register two types of options: String options and numeric options. The
+plugin will use the C<dbi_conn_set_option> function when the configuration
+provides a string and the C<dbi_conn_require_option_numeric> function when the
+configuration provides a number. So these two lines will actually result in
+different calls being used:
+
+ DriverOption "Port" 1234 # numeric
+ DriverOption "Port" "1234" # string
+
Unfortunately, drivers are not too keen to report errors when an unknown option
is passed to them, so invalid settings here may go unnoticed. This is not the
plugin's fault, it will report errors if it gets them from the libraryE<nbsp>/
the driver. If a driver complains about an option, the plugin will dump a
-complete list of all options understood by that driver to the log.
+complete list of all options understood by that driver to the log. There is no
+way to programatically find out if an option expects a string or a numeric
+argument, so you will have to refer to the appropriate DBD's documentation to
+find this out. Sorry.
=item B<SelectDB> I<Database>
blocks you want to refer to must be placed above the database block you want to
refer to them from.
+=item B<Host> I<Hostname>
+
+Sets the B<host> field of I<value lists> to I<Hostname> when dispatching
+values. Defaults to the global hostname setting.
+
=back
=head2 Plugin C<df>
many small files are stored on the disk. This is a usual scenario for mail
transfer agents and web caches.
+=item B<ValuesAbsolute> B<true>|B<false>
+
+Enables or disables reporting of free and used disk space in 1K-blocks.
+Defaults to B<true>.
+
+=item B<ValuesPercentage> B<false>|B<true>
+
+Enables or disables reporting of free and used disk space in percentage.
+Defaults to B<false>.
+
+This is useful for deploying I<collectd> on the cloud, where machines with
+different disk size may exist. Then it is more practical to configure
+thresholds based on relative disk size.
+
=back
=head2 Plugin C<disk>
=back
++=head2 Plugin C<load>
+
+The I<Load plugin> collects the system load. These numbers give a rough overview
+over the utilization of a machine. The system load is defined as the number of
+runnable tasks in the run-queue and is provided by many operating systems as a
+one, five or fifteen minute average.
+
+The following configuration options are available:
+
+=over 4
+
+=item B<ReportRelative> B<false>|B<true>
+
+When enabled, system load divided by number of available CPU cores is reported
+for intervals 1 min, 5 min and 15 min. Defaults to false.
+
+=back
+
+
=head2 Plugin C<logfile>
=over 4
=head2 Plugin C<memcached>
-The C<memcached plugin> connects to a memcached server and queries statistics
+The B<memcached plugin> connects to a memcached server and queries statistics
about cache utilization, memory and bandwidth used.
L<http://www.danga.com/memcached/>
=back
+=head2 Plugin C<mic>
+
+The B<mic plugin> gathers CPU statistics, memory usage and temperatures from
+Intel's Many Integrated Core (MIC) systems.
+
+B<Synopsis:>
+
+ <Plugin mic>
+ ShowCPU true
+ ShowCPUCores true
+ ShowMemory true
+
+ ShowTemperatures true
+ Temperature vddg
+ Temperature vddq
+ IgnoreSelectedTemperature true
+
+ ShowPower true
+ Power total0
+ Power total1
+ IgnoreSelectedPower true
+ </Plugin>
+
+The following options are valid inside the B<PluginE<nbsp>mic> block:
+
+=over 4
+
+=item B<ShowCPU> B<true>|B<false>
+
+If enabled (the default) a sum of the CPU usage accross all cores is reported.
+
+=item B<ShowCPUCores> B<true>|B<false>
+
+If enabled (the default) per-core CPU usage is reported.
+
+=item B<ShowMemory> B<true>|B<false>
+
+If enabled (the default) the physical memory usage of the MIC system is
+reported.
+
+=item B<ShowTemperatures> B<true>|B<false>
+
+If enabled (the default) various temperatures of the MIC system are reported.
+
+=item B<Temperature> I<Name>
+
+This option controls which temperatures are being reported. Whether matching
+temperatures are being ignored or I<only> matching temperatures are reported
+depends on the B<IgnoreSelectedTemperature> setting below. By default I<all>
+temperatures are reported.
+
+=item B<IgnoreSelectedTemperature> B<false>|B<true>
+
+Controls the behavior of the B<Temperature> setting above. If set to B<false>
+(the default) only temperatures matching a B<Temperature> option are reported
+or, if no B<Temperature> option is specified, all temperatures are reported. If
+set to B<true>, matching temperatures are I<ignored> and all other temperatures
+are reported.
+
+Known temperature names are:
+
+=over 4
+
+=item die
+
+Die of the CPU
+
+=item devmem
+
+Device Memory
+
+=item fin
+
+Fan In
+
+=item fout
+
+Fan Out
+
+=item vccp
+
+Voltage ccp
+
+=item vddg
+
+Voltage ddg
+
+=item vddq
+
+Voltage ddq
+
+=back
+
+=item B<ShowPower> B<true>|B<false>
+
+If enabled (the default) various temperatures of the MIC system are reported.
+
+=item B<Power> I<Name>
+
+This option controls which power readings are being reported. Whether matching
+power readings are being ignored or I<only> matching power readings are reported
+depends on the B<IgnoreSelectedPower> setting below. By default I<all>
+power readings are reported.
+
+=item B<IgnoreSelectedPower> B<false>|B<true>
+
+Controls the behavior of the B<Power> setting above. If set to B<false>
+(the default) only power readings matching a B<Power> option are reported
+or, if no B<Power> option is specified, all power readings are reported. If
+set to B<true>, matching power readings are I<ignored> and all other power readings
+are reported.
+
+Known power names are:
+
+=over 4
+
+=item total0
+
+Total power utilization averaged over Time Window 0 (uWatts).
+
+=item total1
+
+Total power utilization averaged over Time Window 0 (uWatts).
+
+=item inst
+
+Instantaneous power (uWatts).
+
+=item imax
+
+Max instantaneous power (uWatts).
+
+=item pcie
+
+PCI-E connector power (uWatts).
+
+=item c2x3
+
+2x3 connector power (uWatts).
+
+=item c2x4
+
+2x4 connector power (uWatts).
+
+=item vccp
+
+Core rail (uVolts).
+
+=item vddg
+
+Uncore rail (uVolts).
+
+=item vddq
+
+Memory subsystem rail (uVolts).
+
+=back
+
+=back
+
+=head2 Plugin C<memory>
+
+The I<memory plugin> provides the following configuration options:
+
+=over 4
+
+=item B<ValuesAbsolute> B<true>|B<false>
+
+Enables or disables reporting of physical memory usage in absolute numbers,
+i.e. bytes. Defaults to B<true>.
+
+=item B<ValuesPercentage> B<false>|B<true>
+
+Enables or disables reporting of physical memory usage in percentages, e.g.
+percent of physical memory used. Defaults to B<false>.
+
+This is useful for deploying I<collectd> in a heterogeneous environment in
+which the sizes of physical memory vary.
+
+=back
+
=head2 Plugin C<modbus>
The B<modbus plugin> connects to a Modbus "slave" via Modbus/TCP and reads
values), large integer values (unsigned 32E<nbsp>bit values) and floating point
values (two registers interpreted as IEEE floats in big endian notation).
-Synopsis:
+B<Synopsis:>
<Data "voltage-input-1">
RegisterBase 0
IgnoreSelectedSnapshot false
</VolumeUsage>
+ <Quota>
+ Interval 60
+ </Quota>
+
+ <Snapvault>
+ Interval 30
+ </Snapvault>
+
<System>
Interval 30
GetCPULoad true
GetDiskOps true
GetDiskIO true
</System>
+
+ <VFiler vfilerA>
+ Interval 60
+
+ SnapVault true
+ # ...
+ </VFiler>
</Host>
</Plugin>
=item B<Host> I<Name>
A host block defines one NetApp filer. It will appear in collectd with the name
-you specify here which does not have to be its real name nor its hostname.
+you specify here which does not have to be its real name nor its hostname (see
+the B<Address> option below).
+
+=item B<VFiler> I<Name>
+
+A B<VFiler> block may only be used inside a host block. It accepts all the
+same options as the B<Host> block (except for cascaded B<VFiler> blocks) and
+will execute all NetApp API commands in the context of the specified
+VFiler(R). It will appear in collectd with the name you specify here which
+does not have to be its real name. The VFiler name may be specified using the
+B<VFilerName> option. If this is not specified, it will default to the name
+you specify here.
+
+The VFiler block inherits all connection related settings from the surrounding
+B<Host> block (which appear before the B<VFiler> block) but they may be
+overwritten inside the B<VFiler> block.
+
+This feature is useful, for example, when using a VFiler as SnapVault target
+(supported since OnTap 8.1). In that case, the SnapVault statistics are not
+available in the host filer (vfiler0) but only in the respective VFiler
+context.
=item B<Protocol> B<httpd>|B<http>
Type: string
+=item B<VFilerName> I<Name>
+
+The name of the VFiler in which context to execute API commands. If not
+specified, the name provided to the B<VFiler> block will be used instead.
+
+Optional
+
+Type: string
+
+Default: name of the B<VFiler> block
+
+B<Note:> This option may only be used inside B<VFiler> blocks.
+
=item B<Interval> I<Interval>
B<TODO>
=back
+=head3 The Quota block
+
+This will collect (tree) quota statistics (used disk space and number of used
+files). This mechanism is useful to get usage information for single qtrees.
+In case the quotas are not used for any other purpose, an entry similar to the
+following in C</etc/quotas> would be sufficient:
+
+ /vol/volA/some_qtree tree - - - - -
+
+After adding the entry, issue C<quota on -w volA> on the NetApp filer.
+
+=over 4
+
+=item B<Interval> I<Seconds>
+
+Collect SnapVault(R) statistics every I<Seconds> seconds.
+
+=back
+
+=head3 The SnapVault block
+
+This will collect statistics about the time and traffic of SnapVault(R)
+transfers.
+
+=over 4
+
+=item B<Interval> I<Seconds>
+
+Collect SnapVault(R) statistics every I<Seconds> seconds.
+
+=back
+
=head2 Plugin C<netlink>
The C<netlink> plugin uses a netlink socket to query the Linux kernel about
locally, or B<DataDir> is set to a relative path, this will not work as
expected. Default is B<true>.
+=item B<CreateFilesAsync> B<false>|B<true>
+
+When enabled, new RRD files are enabled asynchronously, using a separate thread
+that runs in the background. This prevents writes to block, which is a problem
+especially when many hundreds of files need to be created at once. However,
+since the purpose of creating the files asynchronously is I<not> to block until
+the file is available, values before the file is available will be discarded.
+When disabled (the default) files are created synchronously, blocking for a
+short while, while the file is being written.
+
=item B<StepSize> I<Seconds>
B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
=item B<DataDir> I<Directory>
-Set the directory to store RRD-files under. Per default RRD-files are generated
-beneath the daemon's working directory, i.E<nbsp>e. the B<BaseDir>.
+Set the directory to store RRD files under. By default RRD files are generated
+beneath the daemon's working directory, i.e. the B<BaseDir>.
+
+=item B<CreateFilesAsync> B<false>|B<true>
+
+When enabled, new RRD files are enabled asynchronously, using a separate thread
+that runs in the background. This prevents writes to block, which is a problem
+especially when many hundreds of files need to be created at once. However,
+since the purpose of creating the files asynchronously is I<not> to block until
+the file is available, values before the file is available will be discarded.
+When disabled (the default) files are created synchronously, blocking for a
+short while, while the file is being written.
=item B<StepSize> I<Seconds>
The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
-three times five RRAs, i. e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
+three times five RRAs, i.e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
week, one month, and one year.
=back
+=head2 Plugin C<sigrok>
+
+The I<sigrok plugin> uses I<libsigrok> to retrieve measurements from any device
+supported by the L<sigrok|http://sigrok.org/> project.
+
+B<Synopsis>
+
+ <Plugin sigrok>
+ LogLevel 3
+ <Device "AC Voltage">
+ Driver "fluke-dmm"
+ MinimumInterval 10
+ Conn "/dev/ttyUSB2"
+ </Device>
+ <Device "Sound Level">
+ Driver "cem-dt-885x"
+ Conn "/dev/ttyUSB1"
+ </Device>
+ </Plugin>
+
+=over 4
+
+=item B<LogLevel> B<0-5>
+
+The I<sigrok> logging level to pass on to the I<collectd> log, as a number
+between B<0> and B<5> (inclusive). These levels correspond to C<None>,
+C<Errors>, C<Warnings>, C<Informational>, C<Debug >and C<Spew>, respectively.
+The default is B<2> (C<Warnings>). The I<sigrok> log messages, regardless of
+their level, are always submitted to I<collectd> at its INFO log level.
+
+=item E<lt>B<Device> I<Name>E<gt>
+
+A sigrok-supported device, uniquely identified by this section's options. The
+I<Name> is passed to I<collectd> as the I<plugin instance>.
+
+=item B<Driver> I<DriverName>
+
+The sigrok driver to use for this device.
+
+=item B<Conn> I<ConnectionSpec>
+
+If the device cannot be auto-discovered, or more than one might be discovered
+by the driver, I<ConnectionSpec> specifies the connection string to the device.
+It can be of the form of a device path (e.g.E<nbsp>C</dev/ttyUSB2>), or, in
+case of a non-serial USB-connected device, the USB I<VendorID>B<.>I<ProductID>
+separated by a period (e.g.E<nbsp>C<0403.6001>). A USB device can also be
+specified as I<Bus>B<.>I<Address> (e.g.E<nbsp>C<1.41>).
+
+=item B<SerialComm> I<SerialSpec>
+
+For serial devices with non-standard port settings, this option can be used
+to specify them in a form understood by I<sigrok>, e.g.E<nbsp>C<9600/8n1>.
+This should not be necessary; drivers know how to communicate with devices they
+support.
+
+=item B<MinimumInterval> I<Seconds>
+
+Specifies the minimum time between measurement dispatches to I<collectd>, in
+seconds. Since some I<sigrok> supported devices can acquire measurements many
+times per second, it may be necessary to throttle these. For example, the
+I<RRD plugin> cannot process writes more than once per second.
+
+The default B<MinimumInterval> is B<0>, meaning measurements received from the
+device are always dispatched to I<collectd>. When throttled, unused
+measurements are discarded.
+
+=back
+
=head2 Plugin C<snmp>
Since the configuration of the C<snmp plugin> is a little more complicated than
other plugins, its documentation has been moved to an own manpage,
L<collectd-snmp(5)>. Please see there for details.
+=head2 Plugin C<statsd>
+
+The I<statsd plugin> listens to a UDP socket, reads "events" in the statsd
+protocol and dispatches rates or other aggregates of these numbers
+periodically.
+
+The plugin implements the I<Counter>, I<Timer>, I<Gauge> and I<Set> types which
+are dispatched as the I<collectd> types C<derive>, C<latency>, C<gauge> and
+C<objects> respectively.
+
+The following configuration options are valid:
+
+=over 4
+
+=item B<Host> I<Host>
+
+Bind to the hostname / address I<Host>. By default, the plugin will bind to the
+"any" address, i.e. accept packets sent to any of the hosts addresses.
+
+=item B<Port> I<Port>
+
+UDP port to listen to. This can be either a service name or a port number.
+Defaults to C<8125>.
+
+=item B<DeleteCounters> B<false>|B<true>
+
+=item B<DeleteTimers> B<false>|B<true>
+
+=item B<DeleteGauges> B<false>|B<true>
+
+=item B<DeleteSets> B<false>|B<true>
+
+These options control what happens if metrics are not updated in an interval.
+If set to B<False>, the default, metrics are dispatched unchanged, i.e. the
+rate of counters and size of sets will be zero, timers report C<NaN> and gauges
+are unchanged. If set to B<True>, the such metrics are not dispatched and
+removed from the internal cache.
+
+=item B<TimerPercentile> I<Percent>
+
+Calculate and dispatch the configured percentile, i.e. compute the latency, so
+that I<Percent> of all reported timers are smaller than or equal to the
+computed latency. This is useful for cutting off the long tail latency, as it's
+often done in I<Service Level Agreements> (SLAs).
+
+If not specified, no percentile is calculated / dispatched.
+
+=back
+
=head2 Plugin C<swap>
The I<Swap plugin> collects information about used and available swap space. On
When enabled, the I<swap I/O> is reported in bytes. When disabled, the default,
I<swap I/O> is reported in pages. This option is available under Linux only.
+=item B<ValuesAbsolute> B<true>|B<false>
+
+Enables or disables reporting of absolute swap metrics, i.e. number of I<bytes>
+available and used. Defaults to B<true>.
+
+=item B<ValuesPercentage> B<false>|B<true>
+
+Enables or disables reporting of relative swap metrics, i.e. I<percent>
+available and free. Defaults to B<false>.
+
+This is useful for deploying I<collectd> in a heterogeneous environment, where
+swap sizes differ and you want to specify generic thresholds or similar.
+
=back
=head2 Plugin C<syslog>
=back
+=head2 Plugin C<tail_csv>
+
+The I<tail_csv plugin> reads files in the CSV format, e.g. the statistics file
+written by I<Snort>.
+
+B<Synopsis:>
+
+ <Plugin "tail_csv">
+ <Metric "snort-dropped">
+ Type "percent"
+ Instance "dropped"
+ Index 1
+ </Metric>
+ <File "/var/log/snort/snort.stats">
+ Instance "snort-eth0"
+ Interval 600
+ Collect "snort-dropped"
+ </File>
+ </Plugin>
+
+The configuration consists of one or more B<Metric> blocks that define an index
+into the line of the CSV file and how this value is mapped to I<collectd's>
+internal representation. These are followed by one or more B<Instance> blocks
+which configure which file to read, in which interval and which metrics to
+extract.
+
+=over 4
+
+=item E<lt>B<Metric> I<Name>E<gt>
+
+The B<Metric> block configures a new metric to be extracted from the statistics
+file and how it is mapped on I<collectd's> data model. The string I<Name> is
+only used inside the B<Instance> blocks to refer to this block, so you can use
+one B<Metric> block for multiple CSV files.
+
+=over 4
+
+=item B<Type> I<Type>
+
+Configures which I<Type> to use when dispatching this metric. Types are defined
+in the L<types.db(5)> file, see the appropriate manual page for more
+information on specifying types. Only types with a single I<data source> are
+supported by the I<tail_csv plugin>. The information whether the value is an
+absolute value (i.e. a C<GAUGE>) or a rate (i.e. a C<DERIVE>) is taken from the
+I<Type's> definition.
+
+=item B<Instance> I<TypeInstance>
+
+If set, I<TypeInstance> is used to populate the type instance field of the
+created value lists. Otherwise, no type instance is used.
+
+=item B<ValueFrom> I<Index>
+
+Configure to read the value from the field with the zero-based index I<Index>.
+If the value is parsed as signed integer, unsigned integer or double depends on
+the B<Type> setting, see above.
+
+=back
+
+=item E<lt>B<File> I<Path>E<gt>
+
+Each B<File> block represents one CSV file to read. There must be at least one
+I<File> block but there can be multiple if you have multiple CSV files.
+
+=over 4
+
+=item B<Instance> I<PluginInstance>
+
+Sets the I<plugin instance> used when dispatching the values.
+
+=item B<Collect> I<Metric>
+
+Specifies which I<Metric> to collect. This option must be specified at least
+once, and you can use this option multiple times to specify more than one
+metric to be extracted from this statistic file.
+
+=item B<Interval> I<Seconds>
+
+Configures the interval in which to read values from this instance / file.
+Defaults to the plugin's default interval.
+
+=item B<TimeFrom> I<Index>
+
+Rather than using the local time when dispatching a value, read the timestamp
+from the field with the zero-based index I<Index>. The value is interpreted as
+seconds since epoch. The value is parsed as a double and may be factional.
+
+=back
+
+=back
+
=head2 Plugin C<teamspeak2>
The C<teamspeak2 plugin> connects to the query port of a teamspeak2 server and
=head2 Plugin C<varnish>
-The Varnish plugin collects information about Varnish, an HTTP accelerator.
+The I<varnish plugin> collects information about Varnish, an HTTP accelerator.
+
+Synopsis:
+
+ <Plugin "varnish">
+ <Instance "example">
+ CollectCache true
+ CollectConnections true
+ CollectBackend true
+ CollectSHM true
+ CollectESI false
+ CollectFetch false
+ CollectHCB false
+ CollectSMA false
+ CollectSMS false
+ CollectSM false
+ CollectTotals false
+ CollectWorkers false
+ </Instance>
+ </Plugin>
+
+The configuration consists of one or more E<lt>B<Instance>E<nbsp>I<Name>E<gt>
+blocks. I<Name> is the parameter passed to "varnishd -n". If left empty, it
+will collectd statistics from the default "varnishd" instance (this should work
+fine in most cases).
+
+Inside each E<lt>B<Instance>E<gt> blocks, the following options are recognized:
=over 4
Statistics about the shared memory log, a memory region to store
log messages which is flushed to disk when full. True by default.
+=item B<CollectBan> B<true>|B<false>
+
+Statistics about ban operations, such as number of bans added, retired, and
+number of objects tested against ban operations. Only available with Varnish
+3.x. False by default.
+
+=item B<CollectDirectorDNS> B<true>|B<false>
+
+DNS director lookup cache statistics. Only available with Varnish 3.x. False by
+default.
+
=item B<CollectESI> B<true>|B<false>
Edge Side Includes (ESI) parse statistics. False by default.
Inserts and look-ups in the crit bit tree based hash. Look-ups are
divided into locked and unlocked look-ups. False by default.
+=item B<CollectObjects> B<true>|B<false>
+
+Statistics on cached objects: number of objects expired, nuked (prematurely
+expired), saved, moved, etc. False by default.
+
+=item B<CollectPurge> B<true>|B<false>
+
+Statistics about purge operations, such as number of purges added, retired, and
+number of objects tested against purge operations. Only available with Varnish
+2.x. False by default.
+
+=item B<CollectSession> B<true>|B<false>
+
+Client session statistics. Number of past and current sessions, session herd and
+linger counters, etc. False by default.
+
=item B<CollectSMA> B<true>|B<false>
-malloc or umem (umem_alloc(3MALLOC) based) storage statistics.
-The umem storage component is Solaris specific. False by default.
+malloc or umem (umem_alloc(3MALLOC) based) storage statistics. The umem storage
+component is Solaris specific. Only available with Varnish 2.x. False by
+default.
=item B<CollectSMS> B<true>|B<false>
=item B<CollectSM> B<true>|B<false>
-file (memory mapped file) storage statistics. False by default.
+file (memory mapped file) storage statistics. Only available with Varnish 2.x.
+False by default.
+
+=item B<CollectStruct> B<true>|B<false>
+
+Current varnish internal state statistics. Number of current sessions, objects
+in cache store, open connections to backends (with Varnish 2.x), etc. False by
+default.
=item B<CollectTotals> B<true>|B<false>
Collects overview counters, such as the number of sessions created,
the number of requests and bytes transferred. False by default.
+=item B<CollectUptime> B<true>|B<false>
+
+Varnish uptime. False by default.
+
+=item B<CollectVCL> B<true>|B<false>
+
+Number of total (available + discarded) VCL (config files). False by default.
+
=item B<CollectWorkers> B<true>|B<false>
Collect statistics about worker threads. False by default.
The C<write_graphite> plugin writes data to I<Graphite>, an open-source metrics
storage and graphing project. The plugin connects to I<Carbon>, the data layer
-of I<Graphite>, and sends data via the "line based" protocol (per default using
-portE<nbsp>2003). The data will be sent in blocks of at most 1428 bytes to
-minimize the number of network packets.
+of I<Graphite>, via I<TCP> or I<UDP> and sends data via the "line based"
+protocol (per default using portE<nbsp>2003). The data will be sent in blocks
+of at most 1428 bytes to minimize the number of network packets.
Synopsis:
<Plugin write_graphite>
- <Carbon>
+ <Node "example">
Host "localhost"
Port "2003"
+ Protocol "tcp"
+ LogSendErrors true
Prefix "collectd"
- </Carbon>
+ </Node>
</Plugin>
+The configuration consists of one or more E<lt>B<Node>E<nbsp>I<Name>E<gt>
+blocks. Inside the B<Node> blocks, the following options are recognized:
+
=over 4
=item B<Host> I<Address>
Service name or port number to connect to. Defaults to C<2003>.
+=item B<Protocol> I<String>
+
+Protocol to use when connecting to I<Graphite>. Defaults to C<tcp>.
+
+=item B<LogSendErrors> B<false>|B<true>
+
+If set to B<true> (the default), logs errors when sending data to I<Graphite>.
+If set to B<false>, it will not log the errors. This is especially useful when
+using Protocol UDP since many times we want to use the "fire-and-forget"
+approach and logging errors fills syslog with unneeded messages.
+
=item B<Prefix> I<String>
When set, I<String> is added in front of the host name. Dots and whitespace are
B<false> counter values are stored as is, i.e. as an increasing integer
number.
+=item B<Database> I<Database>
+
+=item B<User> I<User>
+
+=item B<Password> I<Password>
+
+Sets the information used when authenticating to a I<MongoDB> database. The
+fields are optional (in which case no authentication is attempted), but if you
+want to use authentication all three fields must be set.
+
=back
=head2 Plugin C<write_http>
<Node "example">
Host "localhost"
Port "5555"
- StoreRates false
- Delay 10
+ Protocol UDP
+ StoreRates true
+ AlwaysAppendDS false
+ TTLFactor 2.0
</Node>
Tag "foobar"
+ Attribute "foo" "bar"
</Plugin>
The following options are understood by the I<write_riemann plugin>:
Service name or port number to connect to. Defaults to C<5555>.
-=item B<StoreRates> B<false>|B<true>
+=item B<Protocol> B<UDP>|B<TCP>
+
+Specify the protocol to use when communicating with I<Riemann>. Defaults to
+B<UDP>.
+
+=item B<StoreRates> B<true>|B<false>
If set to B<true> (the default), convert counter values to rates. If set to
B<false> counter values are stored as is, i.e. as an increasing integer number.
converted values will have "rate" appended to the data source type, e.g.
C<ds_type:derive:rate>.
+=item B<AlwaysAppendDS> B<false>|B<true>
+
+If set the B<true>, append the name of the I<Data Source> (DS) to the
+"service", i.e. the field that, together with the "host" field, uniquely
+identifies a metric in I<Riemann>. If set to B<false> (the default), this is
+only done when there is more than one DS.
+
+=item B<TTLFactor> I<Factor>
+
+I<Riemann> events have a I<Time to Live> (TTL) which specifies how long each
+event is considered active. I<collectd> populates this field based on the
+metrics interval setting. This setting controls the factor with which the
+interval is multiplied to set the TTL. The default value is B<2.0>. Unless you
+know exactly what you're doing, you should only increase this setting from its
+default value.
+
=back
=item B<Tag> I<String>
Add the given string as an additional tag to the metric being sent to
I<Riemann>.
+=item B<Attribute> I<String> I<String>
+
+Consider the two given strings to be the key and value of an additional
+attribute for each metric being sent out to I<Riemann>.
+
=back
=head1 THRESHOLD CONFIGURATION
Here is a configuration example to get you started. Read below for more
information.
- <Threshold>
+ <Plugin threshold>
<Type "foo">
WarningMin 0.00
WarningMax 1000.00
</Type>
</Plugin>
</Host>
- </Threshold>
+ </Plugin>
There are basically two types of configuration statements: The C<Host>,
C<Plugin>, and C<Type> blocks select the value for which a threshold should be