Zabbix Documentation 4.4

3.04.05.0 (current)| In development:5.2 (devel)| Unsupported:1.82.02.22.43.23.44.24.4Guidelines

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manual:installation:upgrade_notes_440

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manual:installation:upgrade_notes_440 [2020/04/20 08:38]
akozlovs Item update interval for unreachable hosts
manual:installation:upgrade_notes_440 [2020/05/21 15:44] (current)
marinagen [ZBX-17767] Minimum screen width for frontend.
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 [[:​manual/​appendix/​install/​real_time_export|Real-time export]] now also includes host names, not only the visible host names. Note that the real-time [[:​manual/​appendix/​protocols/​real_time_export|export protocol]] has been changed with host name information now an object, rather than a string/​array. [[:​manual/​appendix/​install/​real_time_export|Real-time export]] now also includes host names, not only the visible host names. Note that the real-time [[:​manual/​appendix/​protocols/​real_time_export|export protocol]] has been changed with host name information now an object, rather than a string/​array.
 +
 +=== Upgrade with MariaDB 10.2.1 and before ===
 +
 +Upgrading Zabbix may fail if database tables were created with MariaDB 10.2.1 and before, because in those versions the default row format is compact. This can be fixed by changing the row format to dynamic (see also [[https://​support.zabbix.com/​browse/​ZBX-17690|ZBX-17690]]).
  
 ==== Informational ==== ==== Informational ====
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 === Item update interval for unreachable hosts === === Item update interval for unreachable hosts ===
  
-Item update interval for unreachable hosts is changed. Now item check period ​are recalculated based on UnavailableDelay value, not on the item update period. This can potentially change unreachable poller performance.+A bug related to item check time on unreachable hosts has been fixed. This bug was introduced in Zabbix version 3.4.9 or 4.0.0. Now the item check period ​is recalculated based on the UnavailableDelay value, not on the item update period. This can potentially change unreachable poller performance. ​For example, if item previously had a delay of 1h then now it will be checked based on the UnavailableDelay value, not every 1h as it was (due to bug). Therefore it is recommended to increase UnavailableDelay value to avoid possible unreachable poller overload. 
 + 
 +=== Minimum screen width for frontend === 
 +The dashboard grid in Zabbix frontend has been increased from 12 to 24 columns, therefore the minimum supported screen width has been set to 1200px.