+2016-11-30, Version 5.6.2
+ * collectd: A compile error on AIX has been fixed: "MSG_DONTWAIT" is not
+ available on AIX. Thanks to Chao Yang.
+ * collectd: The capability checking has been rewritten to be more
+ portable. Thanks to Florian Forster. #2009
+ * collectd.conf(5): Various typos have been fixed. Thanks to Marc
+ Fournier.
+ * collectd-tg: Incorrect usage of "nanosleep()" has been fixed which
+ caused the tool to sleep (almost) indefinitely. Thanks to Florian
+ Forster.
+ * Build system: Detection of the Java environment has been made
+ deterministic to allow for reproducible builds. Thanks to Marc
+ Fournier. #1523
+ * Build system: Detection of the Lua headers has been improved. Thanks
+ to Ruben Kerkhof.
+ * APC UPS plugin: Unavailable metrics are now skipped instead of
+ reported as 0 (zero). Thanks to Florian Forster. #2025
+ * Modbus plugin: Build issues on FreeBSD have been fixed. Thanks to
+ Florian Forster.
+ * OpenVPN plugin: Gracefully handle empty configurations. Thanks to
+ Pavel Rochnyack. #1932
+ * PowerDNS plugin: The "recursor command" has been fixed so PowerDNS can
+ correctly parse all requested fields. Thanks to Ruben Kerkhof.
+ * Write Graphite and AMQP plugins: A bug that could lead to a missing
+ null-termination has been fixed. Thanks to Markus Linnala.
+ * Write HTTP plugin: A logic error when checking the correctness of the
+ data set has been fixed. Thanks to Pavel Rochnyack. #1996
+ * Write Kafka plugin: The "Key Random" config option has been fixed.
+ Thanks to Florian Forster. #1977
+ * Write Kafka plugin: Support for librdkafka 0.9.0 has been added.
+ Thanks to Florian Forster.
+ * Write Riemann plugin: Build issues on Solaris have been fixed. Thanks
+ to Florian Forster.
+ * ZFS ARC plugin: A duplicate metric has been removed. Thanks to Ruben
+ Kerkhof. #1963
+
+2016-10-07, Version 5.6.1
+ * Build system: Unnecessary linking of the Write Graphite plugin with
+ libyajl has been removed. Thanks to Marc Fournier.
+ Debian#839771, #1976
+ * collectd: A bug in the "FlushInterval" option that caused a
+ segmentation fault in the Write HTTP plugin has been fixed. Thanks to
+ Florian Forster. #1954
+ * Apache plugin: A syntax error has been fixed. Thanks to Florian
+ Forster.
+ * cURL-JSON plugin: A segmentation fault that occurred when handling
+ JSON with unexpected structure has been fixed. Thanks to Florian
+ Forster. #1896
+ * PostgreSQL plugin: Handling of "NULL" values in the "query_plans" and
+ "query_plans_by_table" queries has been fixed. Thanks to Bernd
+ Zeimetz. #1905
+ * RRDCacheD plugin: Reconnection behavior has been added. Thanks to
+ Sebastian Harl. Debian#657877
+ * VServer plugin: Use of a deprecated API ("readdir_r()") has been
+ fixed. Thanks to Sebastian Harl.
+ * Write Graphite plugin: Make default values configurable at compile
+ time again. Thanks to Florian Forster. #1953
+ * Write HTTP plugin: A bug has been fixed that lead to flush callbacks
+ being registered twice. Thanks to Florian Forster. #1955
+
+2016-09-11, Version 5.6.0
+ * Build system: An option to to avoid building the DF plugin against XFS
+ has been added. Thanks to Ruben Kerkhof. #1878
+ * Build system: Autoconf ≥ 2.60, a C99-capable compiler and pkg-config
+ are now required. Thanks to Ruben Kerkhof.
+ * Build system: Building with "-Werror" is now optional. Thanks to Ruben
+ Kerkhof. #1222
+ * Build system: Many compilation issues on non-Linux platforms have been
+ fixed, leading to wider plugin support. Thanks to Ruben Kerkhof,
+ Dagobert Michelsen, Havard Eidnes and Robert Viduya.
+ * Build system: The configuration summary now also ends up in
+ config.log. Thanks to Sebastian Harl.
+ * collectd: All command-line options now override global options from
+ the config file. Thanks to Sebastian Harl. #366
+ * collectd: A number of unit tests for commonly used functions have been
+ added. Thanks to Florian Forster.
+ * collectd: Plugins start up and read timeouts are now logged. Thanks to
+ Marc Fournier. #1293, #1254
+ * collectd: Support for a timeout has been added to "FLUSH" callbacks.
+ Thanks to Manuel Luis Sanmartín Rozada.
+ * collectd: The "-T" command line switch now reports more errors. Thanks
+ to Corey Kosak. #1642
+ * collectd: The max size of value list elements ("DATA_MAX_NAME_LEN")
+ has been doubled and is now configurable at build time. Thanks to Amy
+ Lin, Florian Forster and Radu Brumariu. #1120
+ * Set target: The "MetaData" option has been added. Thanks to Yves
+ Mettier and Kevin Bowling. #1106, #1656, #1913
+ * AMQP, Write_HTTP, Write_Kafka plugins: Support for libyajl < 2 has
+ been added. Thanks to Florian Forster.
+ * APC UPS plugin: Parsing of end markers has been fixed. Thanks to
+ Florian Forster #617
+ * APC UPS plugin: The "PersistentConnection" option has been added.
+ Thanks to Florian Forster #617
+ * ceph, DNS, Exec, IPTables, Ping, turbostat plugins: When running
+ unprivileged, these plugins will now warn about insuffiscient
+ permissions or capabilities(7). Thanks to Marc Fournier. #1530
+ * Chrony plugin: This new plugin collects NTP data from the chrony NTP
+ server. Thanks to Claudius Zingerli. #1548
+ * cpusleep plugin: This new plugin measures time spent by CPU in deep
+ sleep mode. Thanks to Rinigus. #1826
+ * CPU plugin: The "ReportNumCpu" option has been added. Thanks to Fabien
+ Wernli.
+ * cURL, cURL-JSON, cURL-XML plugins: The new "Statistics" reports
+ various per-HTTP connection timers. Thanks to Sebastian Harl. #1004
+ * DBI plugin: The "Interval" option has been added to "Database" blocks.
+ Thanks to Michal Bebjak.
+ * Disk plugin: Support for FreeBSD has been added. Thanks to Xin Li,
+ Brad Davis, Ruben Kerfhof and Kevin Bowling.
+ * Empty Counter match: Support for derives has been implemented. Thanks
+ to Florian Forster. #1813
+ * GenericJMX plugin: Support for TabularData and the "PluginName" option
+ have been added. Thanks to David Crane. #1290, #1291
+ * GPS plugin: This new plugin reports the number of sattelites seen by
+ and precision of a GPS receiver. Thanks to Nicolas Jourden. #1346
+ * gRPC plugin: This new client and server plugin allows sending and
+ receiving metrics using the gRPC protocol. Comparable to the UnixSock
+ plugin, but using TCP and TLS. Thanks to Sebastian Harl and Florian
+ Forster.
+ * Interface plugin: Reporting dropped packets has been added. Thanks to
+ Marc Falzon. #1555
+ * Interface plugin: The "ReportInactive" has been added, letting users
+ skip inactive network interfaces. Thanks to Rinigus. #1791
+ * Interface plugin: The new, Solaris-only "UniqueName" option has been
+ added. Thanks to Yoga Ramalingam. #1416
+ * Lua plugin: This new language binding allows writing plugins using the
+ Lua programming language. Thanks to Julien Ammous, Florian Forster and
+ Ruben Kerkhof.
+ * Memory plugin: Reporting of ARC memory on Solaris has been added.
+ Thanks to Brian ONeill.
+ * MQTT plugin: This new plugin sends metrics to and/or receives metrics
+ from an MQTT broker. Thanks to Marc Falzon, Jan-Piet Mens, Nicholas
+ Humfrey and Florian Forster. #805, #1124
+ * MySQL plugin: Connection to the database server can now be done over
+ SSL. Thanks to Brian Lalor. #1256
+ * MySQL plugin: Monitoring slow queries has been added. Thanks to skob.
+ #1773
+ * MySQL plugin: mysql_bpool_pages-flushed has been renamed to
+ mysql_bpool_counters-pages_flushed because the value is cumulative.
+ Thanks to Marek Becka.
+ * MySQL plugin: Support for Galera statistics has been added. Thanks to
+ Rachid Zarouali. #1849
+ * MySQL plugin: Support for InnoDB metrics was improved. Thanks to Aman
+ Gupta. #1111
+ * MySQL plugin: The "mysql_sort" type has been split into 3 different
+ types. Thanks to Pavel Rochnyack. #1592
+ * Network plugin: Decryption error logging has been improved. Thanks to
+ Pavel Rochnyack. #1735
+ * Notify Nagios plugin: This new plugin sends notifications to Nagios as
+ a passive check result. Thanks to Florian Forster.
+ * NTPd plugin: The plugin now detects if the ntp daemon reports
+ nanoseconds instead of microseconds. Thanks to Matwey V. Kornilov.
+ #1783
+ * OpenLDAP plugin: Several connection-related improvements have been
+ made. Thanks to Marc Fournier. #1308
+ * OpenLDAP plugin: Support for "simple authentication" has been added.
+ Thanks to Marek Becka. #1087
+ * Ping plugin: The "Size" option has been added, allowing the ICMP data
+ payload size to be configured. Thanks to Witold Baryluk. #1395
+ * PostgreSQL, DBI, Oracle plugins: The new "PluginInstanceFrom" option
+ has been added. Thanks to Pavel Rochnyack. #1707
+ * PowerDNS plugin: The recursor metrics have been updated to 3.7.3 and
+ missing rr types have been added. Thanks to Ruben Kerkhof.
+ * Processes plugin: Counting of context switches was added for Linux.
+ Thanks to Manuel Luis Sanmartín Rozada. #1036
+ * Processes plugin: Improve reliability of thread counts on Linux.
+ Thanks to Manuel Luis Sanmartín Rozada.
+ * Python plugin: Minimal Python version requirement has been bumped to
+ 2.6. Thanks to Ruben Kerkhof. #1864
+ * Redis plugin: Several additional metrics are now collected. Thanks to
+ Marc Falzon and Matteo Contrini. #1807, #1483
+ * Sensors plugin: The "UseLabels" option has been added. Thanks to
+ Christian Fetzer.
+ * SMART plugin: The new "IgnoreSleepMode" option has been added. Thanks
+ to Scott Talbert. #1770
+ * SMART plugin: The new "UseSerial" option allows identifying devices in
+ a stable way. Thanks to Scott Talbert. #1794
+ * SNMP plugin: The "IpAddress" can now be used for instances. Thanks to
+ Vincent Bernat. #1397
+ * StatsD plugin: Latency calculation histogram is now able to shrink
+ automatically to optimal size. Thanks to Pavel Rochnyack. #1622
+ * StatsD plugin: The "CounterSum" option has been added. Thanks to
+ Florian Forster. #929, #1282, #1311
+ * UUID plugin: The plugin now also looks in in smbios system table and
+ "/sys/class/dmi". Thanks to Ruben Kerkhof. #1490
+ * virt plugin: The "PluginInstanceFormat" option has been added. Thanks
+ to Ruben Kerkhof. #1100
+ * Write Graphite plugin: The "ReconnectInterval" option has been added.
+ Thanks to Toni Moreno and Florian Forster.
+ * Write HTTP plugin: A KairosDB formatter has been added. Thanks to
+ Aurélien Rougemont. #1809
+ * Write HTTP plugin: Notifications are now handled by this plugin.
+ Thanks to Florian Forster.
+ * Write HTTP plugin: The "LogHttpError" option has been added. Thanks to
+ vzubko.
+ * Write HTTP plugin: The new "Headers" option allows setting custom HTTP
+ headers in outgoing requests. Thanks to Brandon Arp. #1634
+ * Write Kafka plugin: Key handling has been made more comprehensive and
+ reliable. Thanks to Florian Forster, Pierre-Yves Ritschard and Vincent
+ Bernat. #1765, #1695, #1393
+ * Write Redis plugin: The "Database", "MaxSetSize", "Prefix" and
+ "StoreRates" options have been added. Thanks to Brian Kelly and
+ Sebastian Pfahl.
+ * Write Riemann plugin: The new "BatchFlushTimeout" and "Timeout" option
+ have been added. Thanks to Pierre-Yves Ritschard and Gergely Nagy.
+ * Write Riemann plugin: This plugin now requires the riemann-c-client
+ library, version 1.6.0+. This adds support for submitting values to
+ Riemann over TLS. Thanks to Gergely Nagy. #986
+ * Write TSDB, Write Sensu, Write Riemann, Write Graphite, Write TSDB
+ plugin: TCP keepalive is now enabled, helping graceful recovery from
+ unclean network disconnections. Thanks to Marc Fournier. #1549
+ * XenCPU plugin: This new plugin collects XEN Hypervisor CPU stats.
+ Thanks to Pavel Rochnyack. #1608
+ * ZFS ARC plugin: Several new statistics have been added and a couple of
+ obsolete ones removed. Thanks to Brad Davis, Brian ONeill and Ruben
+ Kerkhof.
+ * Zone plugin: This new plugin reads per-zone CPU usage on Solaris.
+ Thanks to Mathijs Mohlmann and Dagobert Michelsen.
+
+2016-11-28, Version 5.5.3
+ * collectd: Write threads are stopped before shutdown callbacks are
+ called. Thanks to Florian Forster. #1110
+ * collectd: A compile error on AIX has been fixed: "MSG_DONTWAIT" is not
+ available on AIX. Thanks to Chao Yang.
+ * libcollectdclient: Lines printed to "STDERR" are now guarded by the
+ environment variable "COLLECTD_TRACE". Thanks to Florian Forster. #105
+ * collectd.conf(5): Various typos have been fixed. Thanks to Marc
+ Fournier.
+ * Build system: Detection of the Java environment has been made
+ deterministic to allow for reproducible builds. Thanks to Marc
+ Fournier. #1523
+ * APC UPS plugin: Unavailable metrics are now skipped instead of
+ reported as 0 (zero). Thanks to Florian Forster. #2025
+ * Battery plugin: The minimum value has been removed from the power type
+ to allow the plugin to report discharging batteries as negative power.
+ Thanks to Florian Forster.
+ * DBI, Oracle and PostgreSQL plugins: An error message when the type
+ instance is truncated has been added. Thanks to Florian Forster. #4
+ * cURL-JSON plugin: A possible segmentation fault when parsing
+ unexpected JSON has been fixed. Thanks to Florian Forster. #1896
+ * DF plugin: Compilation with xfsprogs ≥ 4.7.0 has been fixed. Thanks
+ to Thomas Deutschmann. #1877
+ * Modbus plugin: Build issues on FreeBSD have been fixed. Thanks to
+ Florian Forster.
+ * Network plugin: An error message has been corrected. Thanks to Florian
+ Forster.
+ * Network plugin: Handling of errors form secure memory initialization
+ has been improved: the plugin fails gracefully now instead of calling
+ "abort()". Thanks to Sebastian Harl.
+ * Network plugin: The gcrypt library is only initialized when it is
+ actually required due to the network plugin's configuration. Thanks to
+ Florian Forster. #1902
+ * Ping plugin: The init callback has been changed to be idempotent,
+ fixing errors being reported on Solaris. Thanks to Florian Forster.
+ #869
+ * PostgreSQL plugin: The query_plans and query_plans_by_table queries
+ have been improved to return 0 (zero) instead of "NULL" when not
+ available. Thanks to Bernd Zeimetz. #1905
+ * PowerDNS plugin: The "recursor command" has been fixed so PowerDNS can
+ correctly parse all requested fields. Thanks to Ruben Kerkhof.
+ * Python plugin: Handling of data sets with multiple data sources of
+ different type has been fixed. Thanks to Sebastian Harl.
+ * RRDCacheD plugin: Reconnection behavior after failed operations has
+ been added. Thanks to Sebastian Harl. Debian#657877
+ * Write Graphite and AMQP plugins: A bug that could lead to a missing
+ null-termination has been fixed. Thanks to Markus Linnala.
+ * Write Kafka plugin: Support for librdkafka 0.9.0 has been added.
+ Thanks to Florian Forster.
+ * Write Riemann plugin: Build issues on Solaris have been fixed. Thanks
+ to Florian Forster.
+
+2016-07-25, Version 5.5.2
+ * collectd: A division by zero has been fixed in the
+ "plugin_dispatch_multivalue()" function. Thanks to Corey Kosak.
+ * collectd: The address of the Free Software Foundation has been fixed
+ in GPL license headers. Thanks to Ruben Kerkhof.
+ * Build system: Detection and handling of librrd 1.6 and later has been
+ fixed. Thanks to Ruben Kerkof.
+ * Apache plugin: A warning about a possible misconfiguration has been
+ added. Thanks to Marc Fournier.
+ * cURL, cURL-JSON and cURL-XML plugins: A memory leak when allocating
+ more memory fails has been fixed. Thanks to Brandon Arp.
+ * DF plugin: A build issue on DragonFlyBSD has been fixed. Thanks to
+ Ruben Kerkhof. #1575
+ * Ethstat plugin: Code to strip leading whitespace from device names.
+ This works around an issue in the VMXNet3 driver. Thanks to Thomas
+ Guthmann. #1059
+ * Exec plugin: A problem in the error handling of an fdopen() failure
+ has been fixed. Thanks to @ciomaire.
+ * Modbus plugin: The debug output has been disabled by default. It is
+ now only enabled when building with "--enable-debug". Thanks to Eric
+ Sandeen and Marc Fournier.
+ * Network plugin: A check for the initialization of secure memory has
+ been added. Previously, failure to initialize this memory was
+ ignored. Thanks to @yujokang. #1665
+ * Network plugin: A heap overflow has been fixed in the server code.
+ This issue can be triggered remotely and is potentially exploitable.
+ Thanks to Emilien Gaspar. CVE-2016-6254
+ * Perl plugin: Init callbacks have been changed to run essentially
+ single-threaded to avoid race conditions by init functions which
+ create additional threads. Thanks to Pavel Rochnyack. #1706
+ * Processes plugin: A warning about too long process names has been
+ added. Thanks to Marc Fournier. #1284
+ * Redis plugin: A memory leak in an error handling code path has been
+ fixed. Thanks to Andrés J. Díaz.
+ * Redis plugin: The data source type of the expired_keys metric has been
+ corrected to "DERIVE". Thanks to Marc Falzon and Marc Fournier. #1483.
+ * SMART plugin: A build dependency on libudev has been added. Thanks to
+ Pavel Rochnyack. #1724
+ * StatsD plugin: A deadlock on plugin shutdown has been fixed. Thanks to
+ Pavel Rochnyack #1703
+ * Write HTTP plugin: Freeing of memory holding HTTP headers during
+ shutdown has been fixed. Thanks to Tolga Ceylan.
+ * Write Sensu plugin: A segfault when the Tag was unset has been fixed.
+ Thanks to Marc Fournier.
+ * ZFS ARC plugin: The cache_operation-stolen metric has been removed for
+ FreeBSD 10.2 and later. Thanks to Ruben Kerkhof. #1580
+
+2016-01-22, Version 5.5.1
+ * Build system: Compilation errors have been avoided by correctly
+ defining package name and version used by autoconf. Thanks to Nathan
+ Berkley. #1063
+ * Build system: Dependency ordering was fixed to ensure parallel builds
+ work reliably. Thanks to Gustavo Zacarias. #1125
+ * Build system: Error messages have been improved and building the unit
+ tests has been fixed on Solaris. Thanks to Florian Forster and
+ Dagobert Michelsen. #1077
+ * Build system: The move of the "utils_ignorelist" functions has been
+ reverted. This fixes build issues of numerous plugins. Thanks to
+ Benjamin Drung;. #1323
+ * Build system: The fhcount plugin has been restricted to Linux. Thanks
+ to Ruben Kerkhof. #1195
+ * Build system: Detection of header files for the turbostat plugin has
+ been fixed. Thanks to Marc Fournier. #1075
+ * collectd: The "LC_NUMERIC" locale is now forced, to prevent issues
+ with some plugins on environments using a comma as decimal separator.
+ Thanks to Florian Forster. #1237
+ * Documentation: Some precisions related to the virt plugin have beed
+ added. Thanks to Wojtek Bocer and Ruben Kerkhof.
+ * Documentation: The CollectdInternalStats documentation has been
+ improved. Thanks to Yves Mettier and Florian Forster.
+ * Battery plugin: A missing Type has been added. Thanks to Marc
+ Fournier. #1338
+ * Bind plugin: An off-by-one error has been fixed: an index was checked
+ against a wrong variable, which may lead to an out-of-bounds read.
+ Thanks to Michal Humpula. #1123
+ * Ceph plugin: JSON parsing has been refactored to support ceph 10.0.0
+ and fixes several buffer overflows. Thanks to Florian Forster. #1350
+ * CPU plugin: A Mac OS X specific bug has been fixed: the plugin
+ expected an incorrect number of CPU states, resulting in failing read
+ callbacks. This regression was introduced in 5.5.0. Thanks to Robert
+ Viduya.
+ * Disk plugin: Support for Mac OS X 10.10 has been added. Thanks to
+ Robert Viduya. #1065
+ * IPC plugin: Support for building with musl-libc has been added. Thanks
+ to Natanael Copa. #1147
+ * Log Logstash plugin: A segfault when using libyajl, version 1 was
+ fixed. Thanks to Vincent Bernat. #1190
+ * Log Logstash plugin: The timestamp is now ISO 8601 compliant. Thanks
+ to Marc Fournier. #1132
+ * memcached plugin: The Type of the listen-disabled metric was fixed.
+ Thanks to Florian Forster. #1356
+ * MySQL plugin: The Type used by Innodb_buffer_pool_pages_flushed was
+ fixed. Thanks to Marek Becka. #1085
+ * OpenLDAP plugin: A crash when using LDAPI (LDAP-over-IPC) got fixed.
+ Thanks to Marek Becka. #1080
+ * OpenLDAP plugin: Support for Mac OS X has been added. Thanks to Ruben
+ Kerkhof. #1489
+ * SMART plugin: A memory leak has been fixed. Thanks to Florian
+ Schüller and Pierre-Yves Ritschard. #1076
+ * Swap plugin: A regression that would lead to swap usage being reported
+ in kilobytes (instead of bytes) has been fixed. Thanks to Marek Becka.
+ #1071
+ * Varnish plugin: Support for FreeBSD has been added. Thanks to Ruben
+ Kerkhof. #1182
+ * Varnish plugin: Support for versions 3 and 4 has been made more
+ tolerant to minor changes in Varnish point releases. Thanks to Marc
+ Fournier. #1302
+ * virt plugin: A copy-and-paste mistake in an error message has been
+ fixed. Thanks to Ruben Kerkhof. #1101
+ * Write Kafka plugin: Support for Solaris has been added. Thanks to
+ Shahul Hameed. #1171
+ * Write Redis plugin: Dead code has been removed. Thanks to Brian Kelly.
+ #1143
+ * 27 patches have been applied to numerous plugins and core components,
+ fixing various programming errors which were reported by scan-build,
+ libasan, FBInfer, coverity-scan and clang: Thanks to Ruben Kerkhof,
+ Florian Forster and Marek Becka.
+ * Collectd::Unixsock: A Perl error got corrected. Thanks to Ciaran Mac
+ An Iomaire. #1295
+