Remote command execution on Zabbix Agent, by Proxy, don't follow the manual when it say:

Remote commands on Zabbix agent are executed without timeout by the system.run[,*nowait*] key and are not checked for execution results.

Steps to reproduce:

1. Increased Proxy log level for "task manager" process: zabbix_proxy -c /etc/zabbix/zabbix_proxy.conf -R log_level_increase="task manager"
2. Read the results: tail -f /var/log/zabbix/zabbix_proxy.log

Result:
**

25818:20191008:113044.451 query [txnlev:1] [update task set status=3 where taskid=3001304]
25818:20191008:113044.451 query [txnlev:1] [commit;]
25818:20191008:113044.454 query [txnlev:0] [select command_type,execute_on,port,authtype,username,password,publickey,privatekey,command,parent_taskid,hostid from task_remote_command where taskid=3001305]
25818:20191008:113044.454 In zbx_script_execute()
25818:20191008:113044.454 In zbx_execute_script_on_agent()
25818:20191008:113044.454 In substitute_simple_macros() data:'10050'
25818:20191008:113044.454 In get_value_agent() host:'W2012RODRIGO' addr:'10.34.12.61' key:'system.run[powershell.exe -executionpolicy ByPass -nologo C:\SkyDocs_suporte\skydocs-block-ip.ps1 201.21.161.109,wait]' conn:'unencrypted'
25818:20191008:113044.455 Sending [system.run[powershell.exe -executionpolicy ByPass -nologo C:\SkyDocs_suporte\skydocs-block-ip.ps1 10.0.0.1,*wait*]
25818:20191008:113056.942 get value from agent result: '0'
25818:20191008:113056.942 End of get_value_agent():SUCCEED
25818:20191008:113056.942 End of zbx_execute_script_on_agent():SUCCEED
25818:20191008:113056.942 End of zbx_script_execute():SUCCEED

Expected:

Sending [system.run[powershell.exe -executionpolicy ByPass -nologo C:\SkyDocs_suporte\skydocs-block-ip.ps1 10.0.0.1,*nowait*]

This is leading the command executions to take many time, and fail for more than the half of VMs (it's about 150 Virtual Machines).