Steps to reproduce:

1. Create Zabbix agent(active) item with a scheduled update interval.

Result:

1. Item becomes not supported as expected (Incorrect update interval).
2. Zabbix agent log is constantly reporting this issue:

   16839:20220126:141013.767 active check "system.swap.in[,pages]" is not supported: Incorrect update interval.
   16839:20220126:141013.767 active check "system.swap.in[,pages]" is not supported: Incorrect update interval.
   16839:20220126:141013.767 active check "system.swap.in[,pages]" is not supported: Incorrect update interval.
   16839:20220126:141013.767 active check "system.swap.in[,pages]" is not supported: Incorrect update interval.
   16839:20220126:141013.768 active check "system.swap.in[,pages]" is not supported: Incorrect update interval.
   16839:20220126:141013.768 active check "system.swap.in[,pages]" is not supported: Incorrect update interval.
   16839:20220126:141013.768 active check "system.swap.in[,pages]" is not supported: Incorrect update interval.
   

1. History cache gets full with values from this item:

   zabbix_server -R diaginfo="historycache"
   == history cache diagnostic information ==
   Items:1 values:1288304 time:0.000893
   

1. History syncer gets very busy processing all errors reported by item

   13874 ? S 0:00 /usr/sbin/zabbix_server: history syncer #1 [processed 0 values, 0 triggers in 0.000052 sec, idle 1 sec]
   13875 ? S 16:21 /usr/sbin/zabbix_server: history syncer #2 [processed 37609 values, 28 triggers in 11.000972 sec, syncing history]
   13876 ? S 0:00 /usr/sbin/zabbix_server: history syncer #3 [processed 0 values, 0 triggers in 0.000033 sec, idle 1 sec]
   13877 ? S 0:00 /usr/sbin/zabbix_server: history syncer #4 [processed 0 values, 0 triggers in 0.000061 sec, idle 1 sec]
   

Expected:

1. Item becomes not supported with correct error message.
2. Agent log is not filled with millions of entries.
3. Zabbix server is not processing millions of errors.