• Fix TLS connections in Influxdb/Elasticsearch features leaking file descriptors (#6989 #7018 ref/IP/12219)
• Fixes for delayed and one-time notifications (#5561 #6757)
• Improve performance for downtimes/comments added in HA clusters (#6885 ref/IP/9235)
• check_perfmon supports non-localized performance counter names (#5546 #6418)

Full changelog & announcement.

Changelog & Announcement

Bugfixes:

• Stalled TLS connections on reload/Director deployments (#6816 #6898 ref/NC/588119)
• 'Connection: close' header leading to unstable instance, affects Ruby clients (#6799)
• Server time in the future breaks check result processing (#6797 ref/NC/595861)
• ScheduledDowntimes: Generate downtime objects only on one HA endpoint (#2844 ref/IC/9673 ref/NC/590167 ref/NC/591721)
• Improve activation & syncing for downtime objects generated from ScheduledDowntimes (#6826 ref/IC/9673 ref/NC/585559)
• Generate a runtime downtime object from already running ScheduledDowntime objects (#6704)
• DB IDO: Don't enqueue queries when the feature is paused in HA zones (#5876)
• Crashes with localtime_r errors (#6887)

Documentation updates:

• Ephemeral port range blocking on Windows agents (ref/NC/597307)
• Technical concepts for the check scheduler (#6775)
• DB IDO cleanup (#6791)
• Unified development docs (#6819)

https://icinga.com/2018/11/14/icinga-2-10-2-bugfix-release/

https://icinga.com/2018/10/18/icinga-2-10-1-bugfix-release/

https://icinga.com/2018/10/11/icinga-2-10-released-namespaces-notifications-tls-performance/