As usual this is only a brief overview. Please take a look at the Changelog as well if you are missing something.
IDOUtils: ido2db.cfg enable_sla is now deprecated! #3450
Icinga-Web: tackle cronk is now deprecated
increase core performance on config read with hash compare #3722
keep logfile open, reduce open/close performance decreases #3390
enhance performance on illegal macro and host-service relation processing #3389 #3820
add skipping of status.dat/objects.cache write by setting to /dev/null #3819
fix host_check last_check == next_check wrong in scheduling queue #2195
fix triggered downtimes for child hosts are missing after restart #3390
fix unable to exclude hostgroups when using nested hostgroups #2619
increase performance with hash compare on host/service show/filter #3722
add date/time selector to logfile navigation #3168
classicui can be installed standalone (icinga2 compat) #3869
add config options for acknowledgement notifications and expiry #3467 #3476
add 'executed command' to extinfo.cfg linking to command expander #3901
add process status to json response #3172
add lighttp config examples #2253
use transactions for large object dumps #3527
add socket queue proxy (reduce core reload time significanlty) #3533
oracle: change output columns to clob #3412
fix memory leaks in idomod/ido2db #3749
add workaround fix for num_rows_affected broken in libdbi/mariadb, returned ids are 0 #3728
Revamped credential system, better grouping of permissions and performance #3715
New and smaller Cronk menu design, showing the cronks as a list #3396
New filtering window which allows detailed and combined filters #3268
Many small interface improvements #3511 #3430 #3896
New Apache configuration, making the .htaccess files obsolete #2759
Search in admin user- / group dialog #3909
PENDING are now shown for any new host or service in the database #2602 #3844
add AvailReportParser into contrib/ (standalone) #3978
reorganize directory structure #3742
fixed image expression in pnp4nagios template #3693
fixed state replacement in morning report #3752
fixed rounding error with small numbers #3942
add upgrade/troubleshooting notes about invisible icinga web cronks/modules after upgrade #3939
make install-webconf-auth installs htpasswd.user with icingaadmin credentials #3964
icinga web 1.9: new menu style (smaller icons) #3944
icinga web 1.9: new filtering methods #3947
add userpreferences.xml to icinga web configs #3991
add web gui comparison to beginners #3907
middle-clicking on TOC links doesn't open pages in new tab #3561
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