The software development of Check_MK is organized in so called Werks. A Werk is any change or bug fix that has influence on the user's experiance. Each Werk has a unique ID, one of the levels Trivial Change, Prominent Change or Major Feature and one of the classes Bug Fix, Feature or Security Fix.
Whenever you make an update to a new Check_MK version please make sure that you have understood all incompatible changes. You might have to adapt your configuration.
If you like to get informed about new werks, you can subscribe to various mailinglists which inform you about werks of specific levels.

Werks for:Branch:Till:
Show only incompatible werksShow more than 20 versions

Trivial Change Prominent Change Major Change New Feature Bug Fix Security Fix Incompatible

Version 1.4.0p18
#5435 omd: Fixed "omd update" problems when updating from 1.4.0p17 or older
Version 1.4.0p17
#5261 Agent Bakery: Improve agent bakery robustness when baking new agents
#5427 BI: Fixed different XSS issues triggerd from BI aggregation/rule titles/descriptions
#5353 Checks & Agents: citrix_sessions: fixes a case where no session number was returned
#5354 Checks & Agents: cmctc_lcp: Fixes an error leading to wrong inventory and check output
#5409 Checks & Agents: Windows eventlog: wrong last state saved
#5241 Checks & Agents: netapp_api_connection: removed some invalid warning messages, which appear on virtual netapp systems
#5441 Checks & Agents: mk_oracle: Werk 5321 introduced usage of nawk for SunOS but was implemented incorrectly for Linux
#5240 Checks & Agents: agent_netapp, environmental sensors monitoring. No longer fails if a node has no configured shelfes
#5429 Event Console: Fixed broken event history expiration (when using default settings)
#5426 GUI: df perfometer: Fixed exception when maximum value is not available
#5431 GUI: Fixed possible reflected XSS using custom bookmarks
#5425 GUI: Fixed broken bookmark list management for users with non ascii characters in User IDs
#5424 GUI: Fixed possible exception during logout when having cookies with invalid format for other sites
#5434 GUI: Views: Fixed exception when trying to display downtime IDs in views
#5196 Livestatus: Bumped Livestatus stack size to give regex matching more breathing room.
#5197 Livestatus: Improved Event Console history performance
#5430 Metrics System: Pause page reloads when selecting timerange by using the graph previews
#5423 WATO: Fixed exception on "Catalog of check plugins page"
#5422 omd: Add build support for Ubuntu 17.10 (artful)
#5209 packages: Python: Updated to 2.7.14
Version 1.4.0p16
#5318 BI: BI aggregations can be configured to be in multiple groups
#5347 Checks & Agents: agent_ucs_bladecenter: add option to disable certificate validation
#5349 Checks & Agents: ovs_bonding: display bonding correctly for newer ovs-appctl versions
#5394 Checks & Agents: agent_ucs_bladecenter: Fixed broken agent since 1.4.0p14 (#5233)
#5439 Checks & Agents: storcli_vdrives: Configured check state of related device state was not set properly in some cases. Made that more robust.
#5408 Checks & Agents: Windows perf counter base number formatting was broken
#5344 Checks & Agents: fileinfo: correct handling of file names with spaces in fileinfo.cfg
#5348 Checks & Agents: veritas_vcs: add timeout in the Check_MK agent
#5324 Checks & Agents: check_tcp: Made response time metric readable
#5301 Checks & Agents: infoblox_dhcp_stats: Fixed crash of graphs
#5303 Checks & Agents: local: Fixed missing warn/crit in graphs if upper and lower thresholds are in perfdata
#5307 Checks & Agents: windows_updates: Added information about default cache age and asynchronious execution
#5321 Checks & Agents: mk_oracle: Fixed usage of awk command in case of SunOS which causes 'record ... too long' error
#5260 Metrics System: Fix presentation of mirrored areas
#5404 WATO: Changing "Agent encryption" ruleset now marks bakery as dirty
#5421 WATO: LDAP: Fixed broken sync of group memberships for users with capital umlauts in names
#5398 WATO: Agent bakery: Hide "Bake Agents" context button when not permitted to bake
#5392 WATO: Fixed host monitored from all sites after editing custom host attributes
#5401 WATO: Fixed password auto completion prevention for current Chrome versions
#5399 WATO: Fixed multiple stored XSS injections in WATO dialogs
#5235 WATO: Distributed monitoring: Fixed race condition when unpacking snapshots
#5420 omd: diskspace cleanup: Fixed exception when "Delete additional files when disk space is below" is enabled
Version 1.4.0p15
#5317 BI: BI rules: Fixed renaming rule
#5234 Checks & Agents: Fixed recently introduced issue with non working WATO rules
#5379 Checks & Agents: Allow Windows logfiles to be monitored without monitoring also eventlog
#5389 WATO: Fixed disabling services via discovery page when a host rule exists in wrong folder
#5362 WATO: Fixed possible exception on global settings page related to "diskspace cleanup"
#5391 WATO: Removed CEE specific broken link from host edit page (CRE)
#5388 packages: Dokuwiki: Fixed missing page edit dialog toolbar when using SLES
Version 1.4.0p14
#5315 Agent Bakery: win_printers: Added missing bakery rule
#5211 Agent Bakery: Agent bakery: Reduced agent baking time when monitoring 0 hosts from central site
#5316 Checks & Agents: cmciii.access: Fixed error state handling
#5312 Checks & Agents: citrix_sessions: Fixed crash if not all session values 'total', 'active' or 'inactive' are available
#5339 Checks & Agents: postfix_mailq_status: Now reports if PID file is not readable
#5378 Checks & Agents: Windows agent: Ensure backwards compatibility of section webservices
#5233 Checks & Agents: agent_ucs_bladecenter: Now uses python requests to fetch the data
#5232 Checks & Agents: Agent version check: fixed exception when an offcial release is expected and the agents version is a daily build
#5361 Event Console: Fixed cancelling events by "text" (regression #5057, since 1.4.0p11)
#5212 Event Console: check_mkevents: Improved performance
#5214 GUI: Events in tactical overview can now be disabled
#5215 GUI: Fixed broken nested contact group synchronization (regression in 1.4.0p10)
#5216 GUI: Failed notification checking is now limited to 7 days
#5210 GUI: LDAP: Fixed equal default value for custom variable sync plugins
#5359 Reporting & Availability: Reduced size of PDF exports containing graphs
#5231 WATO: Distributed WATO: Improved site snapshot generation speed, reduces "Activate changes" duration
#5217 WATO: BI: Improved error handling in case of not existing but referenced rule
#5313 WATO: Service discovery: Fixed 'Fix all missing/vanished' action: Disabled services were listed below 'Monitored services' after that button click.
Version 1.4.0p13
#5259 Agent Bakery: cmk-update-agent: Improving robustness in curl handling
#5281 Checks & Agents: apache_status: Fixed ignoring invalid lines
#5280 Checks & Agents: rds_licenss: Fixed missing includes
#5282 Checks & Agents: hpux_tunables: Fixed discovering kernel tunables on HPUX 11.23
#5283 Checks & Agents: megaraid_ldisks: Fixed error during discovery: UnboundLocalError: local variable 'item' referenced before assignment
#5311 Checks & Agents: oracle_performance: Making sure that we use float instead of integer for correct calculations
#5287 Checks & Agents: postfix_mailq: Fixed parameter handling
#5284 Checks & Agents: akcp_exp_humidity akcp_sensor_humidity allnet_ip_sensoric apc_humidity etherbox humidity.include knuerr_rms_humidity stulz_humidity tinkerforge: Fixed wrong parameters
#5279 Checks & Agents: qnap_disks: Just discover slots that are not empty
#5278 Checks & Agents: check_mk_agent.linux: Fixed wrong detected sensors in state "State disasserted"
#5034 Checks & Agents: Do not skip first entry in Windows eventlog
#5016 Checks & Agents: hp_proliant_temp: Fixed crash if thresholds are set manually
#5221 Checks & Agents: esx_vsphere_hostsystem.cpu_usage esx_vsphere_hostsystem.cpu_util_cluster: Fix min/max values in perfdata
#5222 Checks & Agents: mrpe: Fix compatibility of bakery ruleset when updating from 1.2.8*
#5230 Checks & Agents: logwatch/logwatch.ec: fixed "no forwarding" option in rule "Logwatch Event Console Forwarding"
#3919 Reporting & Availability: PDF: Improved handling of long words in text wrapping
#5229 WATO: Rename host: fixed exception when having more than 1024 users configured
#5295 WATO: Service discovery: Fixed permission handling regarding foreign changes if user just performs a service discovery
Version 1.4.0p12
#5258 Agent Bakery: cmk-update-agent: Fix invalid signature error
#5137 Agent Bakery: Fix error when spaces are present in custom agent files
#5125 Checks & Agents: brocade_mlx_power: Fixed wrong index usage which leads to undetected power supplies
#5121 Checks & Agents: check_sql: Added error message if cx_Oracle module is not installed
#5218 Checks & Agents: jolokia_metrics: Fix failing parse function for MBeans containing ":"
#5120 Checks & Agents: ps ps.perf: Fixed regex range introduced with werk 5114 which allows "/" in process name in manual checks
#5014 Checks & Agents: df: Fixed error if dynamic levels should be set
#5205 Core & Setup: Host rename: Fixed broken renaming when new name uses dots
#5204 Core & Setup: Host rename: Fixed broken rename of hosts in rrdcached journal
#5189 Core & Setup: Fixed scheduling of checks after a start/reload of the Micro Core
#5203 GUI: Removed sorting of perfometers
#5228 WATO: WATO Web-API: now able to edit users which were created through the GUI
#5122 WATO: Service discovery: Find SNMP checks of not yet monitored type when using cached data
#5123 WATO: Service discovery: Fix moving services from 'Disabled services' to 'Vanished services' or 'Undecided services'
#5206 WATO: Ruleset quick search now excludes deprecated rulesets
#5126 WATO: Service discovery dialog: Fixed moving services to "Disabled services" for remote sites
#5124 WATO: Service discovery: Fixed permission if user is not allowed to manage services
#5207 WATO: Bulk discovery: Fixed "Maximum number of retries reached" error during bulk discovery
Version 1.4.0p11
#5184 Agent Bakery: Bake agents on restart only affects master sites now
#4565 Agent Bakery: Improving curl and python compatibility of cmk-update-agent
#5142 BI: BI aggregation: Increased compilation performance for large aggregations
#4860 Checks & Agents: mailman_lists: fixed path of python modules for some operating systems
#5199 Checks & Agents: winperf_if: DHCP was always shown as enabled
#5201 Checks & Agents: check_mkevents: Removed deprecated "less verbose output" option
#5055 Checks & Agents: quantum_libsmall_door: Fixed exception in scan function when . is not available
#5054 Core & Setup: SNMPv3 contextes were not always used during discovery
#5027 Core & Setup: Made communication with alert helper more robust.
#5057 Event Console: Fixed cancelling events by "syslog application" when using similar rules
#5169 GUI: LDAP: Fixed syncing contact groups / roles of users with special characters in their name
#5182 GUI: Fixed error "program_version" in master control snapin when disabling a site
#5056 GUI: WATO: Wrong list of groups shown on user edit page when syncing groups via LDAP
#5200 GUI: Removed CEE specific link to Reports from Bookmark list pages
#5198 GUI: Delete contact groups: Fixed error message when users have no alias
#5185 HW/SW-Inventory: Check_MK HW/SW Inventory: The service was executed too often by default
#5202 Reporting & Availability: Fixed timeouts when generating reports (regression in #4957)
#5168 WATO: Fixed highlighting of rules when searching for ineffective rules
#5139 WATO: Fixed baked agent download page when user had no global bakery permissions
#5140 WATO: WATO Web API: add_users/edit_users: now able to set password attribute
#5141 WATO: WATO Web API: Introducing parameter request_format
#5030 WATO: Skype section can now be enabled/disabled in agent bakery
#5183 packages: Updated shipped navicli to
Version 1.4.0p10
#4564 Agent Bakery: Compatibility fix for windows agent updater
#5115 Checks & Agents: zfs_arc_cache: Fixed wrong detected lines from agent output if they contain no counters, eg. 'class = misc'
#5116 Checks & Agents: if.include: Fixed wrong handling of duplicate interfaces if "use alias" or "use desccription" is configured
#5091 Checks & Agents: Perfometer: Allow zero as maximal value; Fixed unsupported operand type for /: 'float' and 'NoneType'
#5114 Checks & Agents: ps ps.perf: Allow "/" in process name in manual checks
#5110 Checks & Agents: appdynamics_memory: Fixed crashing if max. available for heap or non-heap memory is zero
#5089 Checks & Agents: citrix_xenapp.ps1: Refactored; now uses powershell commands for Citrix environment instead of WMI objects which caused runtime errors
#5082 Checks & Agents: gude_powerbanks: Adapted discovery of powerbanks
#5087 Checks & Agents: brocade_fcport: Fixed conversion of BB credits
#5079 Checks & Agents: windows_tasks: Adapted man page; Some OK states were missing
#5078 Checks & Agents: lnx_distro: Detects version and name of Check_MK Appliance correctly
#5083 Checks & Agents: oracle_locks: Do not discover if data is incomplete
#5093 Checks & Agents: dell_poweredge_temp: Fixed device levels handling if they are empty
#4856 Checks & Agents: Check_MK was unable to handle cached tcp data greater than 10MB
#4857 Checks & Agents: esx_vsphere_vm.datastores: this check always reported only one datastore information
#4853 Checks & Agents: agent_netapp: Re-enabled some deprecated SSL Ciphers which were used in old 7mode filers
#5113 Checks & Agents: cifsmounts nfsmounts: Fixed wrong reported error message if user has not right permissions on mount point
#4804 Checks & Agents: brocade_fcport: Fix limiting discovered ports by operational and physical status
#4859 Checks & Agents: MSSQL: plugin detects 32bit and 64bit instances now
#4982 Checks & Agents: zypper: Made check more robust against different SLES 12 service packs
#5096 Checks & Agents: mk_oracle_crs: crs_stat command is deprecated since Oracle 11gR2; Now the plugin handles that correctly
#5095 Checks & Agents: "Round trip average" graph: Added warn and crit lines
#4984 Checks & Agents: aix_service_packs: Cleaned up mixture of the latest and all past service packs
#4983 Checks & Agents: brocade_fcport: Fixed wrong speed information
#5025 Core & Setup: Make communication with smartping helpers more robust
#5026 Core & Setup: Fixed possible core dumps during config reload
#5047 Event Console: EC views: Fixed "Events of host X" views of unrelated events
#5045 GUI: Custom icons and actions: Add macros for getting URL encoded values
#4987 HW/SW-Inventory: oracle_instance: Removed uptime from inventory plugin in sense of werk #4485
#5022 Livestatus: Fixed timperiod history calculation
#5023 Livestatus: Fixed parsing of monitoring history.
#5024 Livestatus: Fixed parsing of some host-related monitoring history entries.
#4812 Notifications: Add missing Acknowledge author to host notifications
#5069 Reporting & Availability: Choose correct owner for report schedule entry when creating a new one
#5081 Reporting & Availability: Reporting: Fixed converting old title format into new one
#5051 WATO: Fixed backup/restore of encrypted backups
#5048 WATO: Service discovery: Fixed handling of "full scan" of new SNMP hosts
#5050 WATO: Fixed error "You need to specify a backup job." when restoring a backup
#5092 WATO: Service discovery performance: Do full scan once only right after clicking full scan
#5098 WATO: Fix sporadic exception during activation
#5099 WATO: Fix custom user attributes un user form
Version 1.4.0p9
#4991 Agent Bakery: Fixed the Installed-Size header of baked deb packages
#4973 Checks & Agents: zpool: Fixed missing include statement which causes undefined 'df_inventory' error if using Nagios core
#4972 Checks & Agents: mk_inventory.aix: Use MK_VARDIR instead of MK_CONFDIR for the state file
#4976 Checks & Agents: wmi_cpuload: Fixed UNKNOWN service state due to werk #4742
#4915 Checks & Agents: solaris_mem: Unified graphs and Per-O-Meter with common memory checks
#4978 Checks & Agents: ipmi: Ignore sensors with state 'na'
#5021 Checks & Agents: Make sure that the output of the event console active check is valid
#4980 Checks & Agents: mssql_counters.file_sizes: Added readable titles of related metrics
#4914 Checks & Agents: statgrab_mem: Plugin is now prioritized over solaris_mem if both is available
#4968 Checks & Agents: f5_bigip_cluster_status_v11_2: Now has its own check plugin file; This updates werk #4819
#4884 Checks & Agents: oracle_logswitches: Fixed missing oracle.include
#4849 Checks & Agents: Windows mrpe scripts: strip leading whitespaces in mrpe command
#4846 Checks & Agents: ESX monitoring: fixed incomplete data, when the xml response from the esx server includes newlines
#4844 Checks & Agents: Windows Agent / Fileinfo: now able to read files meta information (size, age) even when file is locked
#4801 Checks & Agents: emc_datadomain_fs: Fix broken filesystem graph
#4850 Checks & Agents: Improved WATO service discovery performance
#4848 Checks & Agents: Windows Agent / fileinfo: fixed another issue, where meta information (size,age) was not accessible
#4956 Core & Setup: Fixed possible exception in cmc.log when working with piggyback data
#5038 Core & Setup: Datasource programs: Prevent zombie processes in case of timeouts
#4993 Event Console: Fixed visibility of events for users with limited access to events
#4951 Event Console: Added missing host custom variables to notifications created by the EC
#5003 Event Console: Fixed missing filtering by effective contact groups of events
#4950 GUI: Virtual host tree: Fixed navigating back to root of tree
#5002 GUI: Fixed possible exception related to multisite_user_connectors on login failures
#4949 GUI: Fixed grouping by host-/servicegroup in availability views
#4988 GUI: LDAP: Improve error handling in case of authentication failures
#4992 GUI: Fixed sending fake DOWN states for hosts when using Nagios core
#4969 GUI: Service discovery view: Fixed sorting service descriptions
#4952 GUI: Fixed broken alert statistics view (regression since 1.4.0p8)
#4852 Livestatus: Livestatus connections: fixed bug where data from previous connection got reused
#5018 Livestatus: Handle vanished service groups correctly
#4563 Metrics System: Fix issue with @ in metric title
#4997 Metrics System: Fixed visibility of metric toggle switch in graph designer
#4957 Reporting & Availability: Group headers of views are now displayed in PDF reports
#5001 Reporting & Availability: PDF exports: Default graph layout options were not applied
#4953 WATO: Fixed possible exception during activation when files are modified while activating
#4954 WATO: Host/Folder properties: fixed displaying of inherited checkbox tag group values
#4994 WATO: Analyze host rulesets: Fixed rendering of some values (e.g. Count, size and age of files)
#4995 WATO: Fixed broken link from contact group list page to rulesets
#4996 WATO: Backup targets: Fixed possible MemoryError exception when editing a target
Version 1.4.0p8
#4881 Checks & Agents: multipath: Fixed service details: Number of paths were interpreted as expected paths
#4879 Checks & Agents: akcp_sensor_humidity akcp_exp_humidity: Fixed wrong order of level evaluation
#4876 Checks & Agents: mounts: Fixed wrong handling of NFS mounts on Linux which are detected as stale
#4875 Checks & Agents: Fixed graph labeling and unit of active HTTP service
#4883 Checks & Agents: juniper_trpz_aps_sessions: Fixed performance data handling if running on cluster
#4948 Checks & Agents: ups_modulys_battery.temp: Fixed possible "check_temperature" not found exception
#4912 Checks & Agents: rds_licenses: Fixed exception if agent bakery is used to deploy this plugin
#4909 Checks & Agents: arris_cmts_cpu: Fixed crash if thresholds are set
#4908 Checks & Agents: enterasys_powersupply: Fixed crash if empty output
#4823 Checks & Agents: netapp_api_cpu: Fixed crash if data for node is missing
#4874 Checks & Agents: cisco_power: Improved discovery of power supplies
#4880 Checks & Agents: wut_webtherm wut_webtherm.humidity: Fixed missing device type and enabled performance data for humidity
#4827 Checks & Agents: domino_info: Fixed crash if some information is missing
#4838 Checks & Agents: netapp_api_volumes: No longer shows service descriptions with UUIDs
#4873 Checks & Agents: printer_supply: Fixed IndexError in case of missing colour information
#4825 Checks & Agents: mkbackup: Fixed crash if size of backup is not reported because of a failure
#4824 Checks & Agents: f5bigip_conns: Fixed crash if Parameters are at 'No Levels'
#4839 Checks & Agents: windows agents: fixed invalid hieroglyps in agent output, when plugin output includes FF FE byte order mark
#4826 Checks & Agents: juniper_cpu_util: No crash anymore if information is not provided
#4841 Checks & Agents: esx_vsphere_hostsystem.cpu_usage: fixed missing cpu checks when querying vcenter with windows agent
#4843 Checks & Agents: Windows Agent / logfile monitoring: fixed agent crash when * was used as file wildcard
#4842 Checks & Agents: Windows Agent / Exchange Monitoring: fixed broken MSExchange checks
#4872 Checks & Agents: zfs_arc_cache: Fixed conversions of size, arc meta used, arc meta limit and arc meta max
#4939 Core & Setup: Always use DNS when looking up the IP of Graphite servers
#4940 Event Console: Handle non-ASCII characters in event console messages
#4933 Event Console: Fixed possible KeyError event_host in EC views since 1.4.0p6
#4928 GUI: Views: Toggle all checkboxes in row select was missing last row in grouped views
#4934 GUI: Views: Fixed possible broken table background when using "table" layout with zoomed pages
#4918 GUI: EC views: Hiding wrong icons for events that are not related to a host
#4902 GUI: Monitoring history views: Fixed possible XSS when displaying "plugin output"
#4922 GUI: Logwatch: Show only hosts with problematic log files in "Problematic log file" list
#4878 HW/SW-Inventory: lnx_distro: Fixed wrong detected distribution name, vendor and version
#4938 Notifications: Make sure that a notification has the plugin output available
#4932 WATO: Timeperiod iCalendar import: Fixed broken import of full day entries
#4935 WATO: Foldertree snapin: Fixed broken layout when using localized GUI
#4900 WATO: Activate changes: Improved error reporting during activate changes
#4919 WATO: Service discovery: Fixed disabling services with backslashes in description
#4899 WATO: Don't fail WATO snapshot creation because of modified temporary files
#4923 WATO: Host diagnostic: Fixed error when saving host with DNS name as IPv4 address
#4926 WATO: LDAP: Use Check_MK trusted certificate authorities for validating certificates
#4930 WATO: Fix activation page not reloading after activation in some cases
#4927 WATO: LDAP: Use port 636 instead of 389 by default when enabling SSL
#4931 WATO: Trusted certificate authorities: Silently ignore dangling symlink errors
#7661 omd: Fixed possible stored XSS using the internal server error handler
Version 1.4.0p7
#4562 Agent Bakery: Fixed issue with Windows Agent Updater file permissions
#4871 Checks & Agents: if.include: Added missing interface types
#4837 Checks & Agents: netapp_api_if: a grouped interface now reports a WARNING when one of its member interfaces is down
#4897 Checks & Agents: check_bi_aggr: Fixed URL in error messages in case of exceptions during checking
#4895 Core & Setup: cmk --convert-rrds: Don't fail when RRDs refered by PNP XMLs are missing
#4896 GUI: Views: Services are now sorted correctly again
#4694 Livestatus: Reloading the Nagios core works again
#4695 Livestatus: Make communication with event console more robust
#4836 Notifications: Notifications rules: Modifying a rule always set the option "allow users to deactivate this notification"
#4894 WATO: Fixed still visible sites on "activate changes" page after deletion
#4891 WATO: Trusted CA certificate file is now updated during all WATO activations
#4893 WATO: Fixed creation of default "local" site
#4782 WATO: Prevent deletion of parent host
#4892 WATO: Cleanup site changes of deleted sites correctly
#7659 distros: CentOS 7: Removed not needed dependency to mariadb-server package
#7660 packages: Added missing livedump binary to bin path
Version 1.4.0p6
#4561 Agent Bakery: Agent Updater compatibility fix for older python versions (<2.6)
#4819 Checks & Agents: f5_bigip_cluster_status.v11_2: Fixed wrong syntax in naming of the check plugin
#4789 Checks & Agents: check_mk_agent.aix: Fixed computation of uptime
#4785 Checks & Agents: oracle_locks: New SQL for check
#4830 Checks & Agents: IP lookup cache: Fixed bug were updated ipaddress was overwritten by old cached data
#4833 Checks & Agents: Windows Agent: Fixed pipe handle leak whenever plugin/mrpe scripts raised an error
#4869 Checks & Agents: apc_symmetra apc_symmetra_input apc_symmetra_output: Fixed wrong WATO rulesets
#4868 Checks & Agents: oracle_tablespace: Restrict data for check from primary
#4858 Checks & Agents: omd_apache data collection: fixed issues caused by missing newline at the end of statsfile(s)
#4784 Checks & Agents: oracle_rman: wrong detection of level 1 backup
#4821 Checks & Agents: heartbeat_crm: Made Check more robust
#4760 Checks & Agents: Fixed vanishing CUPS queues services on systems using systemd
#4756 Core & Setup: Fix possible timeouts when changing configurations or changing user profile properties
#4890 Core & Setup: Fixed broken management board monitoring when using the Microcore
#4755 Core & Setup: Fixed possible error when processing piggyback monitoring data
#4888 Event Console: Fixed missing link to "events of host" view for hosts the user may see
#4829 GUI: netapp_api_volumes: fixed missing read/write/latency graphs for the various data protocols
#4834 GUI: Quicksearch: fixed quoting problem with \ in service description
#4761 GUI: Fixed multisite setups with sites using Check_MK/Livestatus < 1.4
#4832 GUI: Quicksearch: Malformed regular expressions generated no error message when no specific filters were set
#4757 GUI: Fixed possible reflected XSS in webapi.py
#4759 GUI: Fixed some wrong escaped links in help texts
#4758 GUI: Fixed site status and master control snapin not displaying states of sites
#4714 HW/SW-Inventory: Inventory win_networkadapter: Fixed exception when values were missing
#4831 HW/SW-Inventory: HW/SW inventory: fixed missing inventory data from slave sites for new hosts
#4692 Livestatus: Correctly handle deactivated event console when Nagios core is used.
#4693 Livestatus: Catch communication errors with the event console when the Nagios core is used.
#4765 Livestatus-Proxy: Liveproxyd: Fixed possible exception in case of temporary load issues
#4870 Metrics System: Fixed ineffective graph time range display option
#4762 Notifications: Showing correctly formated plugin output in "analyse notifications table"
#4828 Notifications: User notification rules can now be canceled
#4763 Notifications: HTML mails: Fixed wrong rendered state markers in plugin outputs
#4754 WATO: Fixed possible "Operation not permitted issue" during activation
#4835 WATO: windows_updates.vbs: this plugin automatically configured to asynchron execution and 4 hours cached
#4889 WATO: LDAP connections: Fixed exception when using "nested groups" with groups to roles plugin
#4764 WATO: Fixed internal automation error handling when syncing with 1.2.8 or older
#7658 deb: Debian Stretch: Added missing dependency to apache2
#7514 omd: Fixed SSL connection issues in different situations
#7662 packages: NagVis: Updated to NagVis 1.9.1
#7656 packages: NagVis: Updated to version 1.9.2
#7657 packages: Updated naviseccli to to fix segfaults on some platforms
Version 1.4.0p4
#4781 Checks & Agents: mk_oracle mk_oracle.aix: Added support for Oracle 12.2
#4779 Checks & Agents: check_mk_agent.freebsd check_mk_agent.solaris: Reduce agent output by excluding mirror devices
#4818 GUI: Fixed "No Data" in Tactical Overview if missing permissions to see failed notifications
#4713 GUI: logwatch: fixed missing "Clear log" button for normal user in distributed setup
#4780 HW/SW-Inventory: HW/SW inventory: Removed entries about section ages provided by check_mk_agent; this reverts Werk 3904
Version 1.4.0p3
#4712 BI: BI availability: Fixes bugs related to no configured BIs and BIs only showing services
#4792 Checks & Agents: Fixed wrong unit in graph for tape utilization
#4790 Checks & Agents: Fixed scaling for the average in interface services of pnp4nagios graphs
#4778 Checks & Agents: lnx_quotas: Adapted plugin output if TABS are used in fstab
#4777 Checks & Agents: esx_vsphere_sensors: Fixed wrong interpretation of ESX sensor health state 'UNKNOWN'
#4793 Checks & Agents: chrony: Changed to raw IP address without dns name to avoid empty output
#4799 Checks & Agents: printer_input: Make check work with newer revisions of the Printer-MIB
#4798 Checks & Agents: fortigate_ipsecvpn: Fix broken default parameters
#4795 Checks & Agents: netstat: Fixed wrong output if LISTENING connections should be monitored on Ubuntu
#4794 Checks & Agents: check_mk_agent.solaris: Now considers top in /usr/bin/ and /usr/local/bin/
#4624 Checks & Agents: postfix_mailq: Now takes correct parameters if checking the length of queues
#4775 Checks & Agents: fortigate_sessions: Improved missing or invalid output handling
#4637 Checks & Agents: blade_blades: Fixed buggy state validation
#4636 Checks & Agents: Added compatibility for Lenovo blades
#4635 Checks & Agents: raritan_emx_sensors.temp raritan_px_sensors: Fix checks for Nagios core, add missing WATO rule to raritan_px_sensors
#4800 Checks & Agents: zpool: Enable check to handle variant output of zpool list command
#4772 Checks & Agents: cisco_wlc cisco_wlc_clients: Added support for Cisco 1850 devices
#4774 Checks & Agents: wmi_cpuload: Expanded missing information handling
#4773 Checks & Agents: mssql_instance: Added error handling if plugin fails to gather SQL server instances
#4634 Checks & Agents: aix_if: Make check work with different ifconfig output format
#8656 GUI: Button "All Logfiles" in logwatch user interface now works in distributed mode
#4776 HW/SW-Inventory: solaris_psrinfo: Fixed handling of newer output eg. of Solaris SPARC T5
#4711 Notifications: mknotifyd: parts of master configuration could be transfered to the slave sites
Version 1.4.0p2
#4560 Agent Bakery: Fix implausible error msg from windows agent updater
#4769 Checks & Agents: saprouter_cert: More robust detection of "not after" value
#4770 Checks & Agents: ipmi_sensors: Added performance data for all temperature sensors
#4788 Checks & Agents: openhardwaremonitor: New support of current hardware
#4797 Checks & Agents: Removed deprecated global service discovery setting and added new standard rule
#4707 Checks & Agents: netapp_api_vf_stats: improved computation of CPU utilization, now showing number of processors
#4708 Checks & Agents: Windows Agent/Agent Updater: Fixed raise condition which removed the windows service
#4771 GUI: MKP manager: Fixed broken listing of unpackaged files
#4053 GUI: Summary line in BI availability moved when sorting. It is fixed now.
#4710 Notifications: mknotifyd did not always reload its configuration
#4709 Notifications: Notifications: Missing SERVICECONTACTGROUPNAMES/HOSTCONTACTGROUPNAMES parameters no longer causes a notification not to be sent
#8290 WATO: Fixed new service description selection for new sites
Version 1.4.0p1
#4703 BI: Business intelligence: fixed various display and navigation bugs in timelines page
#4745 Checks & Agents: multipath: Fixed crash on Dell devices if a colon is on uuid
#4704 Checks & Agents: MSI generation: fixed bug in MSI version number generation which broke the 1.4.0 MSI installer
#4744 Checks & Agents: msexch_rpcclientaccess: Fixed discovery failure because of an non existing item
#4706 Event Console: Fixed broken upload of snmp mibs (cannot import name defaultMibPackages)
#4751 GUI: Fixed "dragging not defined" javascript error on dashboards
#4752 WATO: MKP manager: Fixed creating packages for 1.4.0i* releases
#4705 WATO: Fixed broken flexible notifications configuration
Version 1.4.0
#4559 Agent Bakery: Prevent Check_MK agent updater from running multiple times
#4740 Checks & Agents: mysql: Fixed crash if instance is not available anymore
#4739 Checks & Agents: hp_proliant_da_phydrv: Implemented new possible values
#4741 Checks & Agents: dell_powerconnect_temp: Fixed missing reference for computing the temperature
#4743 Checks & Agents: f5_bigip_conns: Fixed crash if empty values
#4748 Checks & Agents: solaris_fmadm: Check was only discovered when an error is detected
#4735 Checks & Agents: check_mailboxes: Fixed broken check when setting "connect timeout" option
#4742 Checks & Agents: wmi_cpuload: Added required tables to prevent crash
#4734 Checks & Agents: check_mail check_mail_loop check_mailboxes check_sql: Passwords from password store were not used correctly
#4632 Checks & Agents: fsc_subsystems: No longer crash when statuscode is missing
#4631 Checks & Agents: cisco_ace_rserver: Fix broken IP address parsing
#4663 Checks & Agents: check_mailboxes: Removed useless report_age which causes TypeError: float() argument must be a string or a number
#4633 Checks & Agents: jolokia_metrics.uptime: No longer crash when agent info is incomplete
#4664 Checks & Agents: netapp_api_qtree_quota: Fixed NameError: name 'is_digit' is not defined
#4690 Core & Setup: Fixed handling of state changes when cmcdump is used
#4746 GUI: Fixed using HW/SW inventory filters in views without inventory painters
#4702 GUI: Quicksearch: fixed minor parsing issue when using specific filters
#4568 HW/SW-Inventory: mk_inventory.vbs: fixed getNetworkAdpater function to prevent errors caused by null arrays
#4430 Livestatus: Fixed logwatch-related Livestatus queries in NEB module
#4750 WATO: Ensure uploaded icons are saved with their filename instead of paths
#4747 WATO: Fixed resetting global settings to factory defaults
Version 1.4.0b9 (Not yet released)
Tuesday, 5/30/2017
#7655 packages: NagVis: Configuring Check_MK BI backend for local site by default now
#7654 packages: NagVis: Update to 1.9
Tuesday, 5/23/2017
#7652 omd: Diskspace cleanup config is now synced to slave sites like other settings
Version 1.4.0b8
#4717 Agent Bakery: Fixed "corrupted package" archive messages when installing DEB packages baked on SLES
#4658 BI: Fixed permissions in BI packs using rules from other packs
#4722 Checks & Agents: agent_ucs_bladecenter: Fixed broken special agent
#4732 Checks & Agents: systemd: Don't kill child processes of the agent
#4736 Checks & Agents: ucs_bladecenter_if: Fixed crash if fabric interconnects are aggregated
#4726 Checks & Agents: ps: Process memory graph: Removed duplicated "resident size" metric
#4661 Checks & Agents: msexch_isstore msexch_isclienttype: Split up check files. Second one needs its own check plugin file if using Nagios core
#8289 Checks & Agents: wagner_titanus_topsense.smoke: Adapted levels to be more user friendly
#4728 Core & Setup: Check_MK service: Fixed handling of "State in case of empty agent output"
#4716 Core & Setup: Fixed broken config when selecing "empty" icon as host/service icon image
#4689 Core & Setup: Fixed buffer overflow when importing cmcdump data
#4718 Core & Setup: Fixed memory leak in Check_MK check helpers when started in verbose mode
#4725 Core & Setup: Significant improvement of Check_MK check helper memory usage
#4731 Event Console: Fixed exception when receiving SNMPv3 INFORM messages: ignore them now
#4660 HW/SW-Inventory: win_os: Fixed wrong OS information if eg. ESX is installed on Windows host
#4688 Livestatus: Emit error message in livestatus response
#4721 WATO: Improved error handling when a ruleset value can not be rendered on agent bakery page
#4685 WATO: Fixed exception when trying to reset a global setting twice
#4684 WATO: Fixed visualization of on/off toggles in global settings
#4724 WATO: Web-API: Fixed create_folder parameter of add_host call
#4719 WATO: Folder host list: Improved performance for folders with a large number of hosts
#4720 WATO: The settings of the MK Notify daemon could be lost when saving other global settings
#4723 WATO: Web-API: Fixed effective_attributes parameter for get_host/get_all_hosts calls
#7650 packages: NagVis: Updated to 1.9b19
#7651 packages: pnp4nagios: Fixed broken custom time range selection

You can find a list of all werks including older versions here.