Zabbix The custom key test failed

To do a very simple collection system memory usage monitoring, according to the various information on the Internet to obtain the method as follows:
Modify several configurations in the zabbix_agentd.conf

UnsafeUserParameters=1UserParameter=mem.usage,/usr/bin/free -m |grep Mem | awk '{print $3}'

Then Zabbix_agentd-t Mem.usage, return the error

mem.usage                                     [m|ZBX_NOTSUPPORTED] [Unsupported item key.]

Try another one that feels the same way:
Modify several configurations in the zabbix_agentd.conf

UnsafeUserParameters=1Include=/app/local/zabbix/conf/zabbix_agentd/*.conf

Then create the mem_usage.conf file in the/app/local/zabbix/conf/zabbix_agentd/

The content in mem_usage.conf is

UserParameter=mem.usage,HOME=/app/local/zabbix/sh/mem_usage.sh

Create a mem_usage.sh file in/app/local/zabbix/sh/with the contents of

#!/bin/bash/usr/bin/free -m |grep Mem |awk '{print $3}'

Run this script to return the result correctly, but use zabbix_agentd-t mem.usage to return an error

mem.usage                                     [m|ZBX_NOTSUPPORTED] [Unsupported item key.]

Seek the guidance of the great God ....

Reply content:

To do a very simple collection system memory usage monitoring, according to the various information on the Internet to obtain the method as follows:
Modify several configurations in the zabbix_agentd.conf

UnsafeUserParameters=1UserParameter=mem.usage,/usr/bin/free -m |grep Mem | awk '{print $3}'

Then Zabbix_agentd-t Mem.usage, return the error

mem.usage                                     [m|ZBX_NOTSUPPORTED] [Unsupported item key.]

Try another one that feels the same way:
Modify several configurations in the zabbix_agentd.conf

UnsafeUserParameters=1Include=/app/local/zabbix/conf/zabbix_agentd/*.conf

Then create the mem_usage.conf file in the/app/local/zabbix/conf/zabbix_agentd/

The content in mem_usage.conf is

UserParameter=mem.usage,HOME=/app/local/zabbix/sh/mem_usage.sh

Create a mem_usage.sh file in/app/local/zabbix/sh/with the contents of

#!/bin/bash/usr/bin/free -m |grep Mem |awk '{print $3}'

Run this script to return the result correctly, but use zabbix_agentd-t mem.usage to return an error

mem.usage                                     [m|ZBX_NOTSUPPORTED] [Unsupported item key.]

Seek the guidance of the great God ....

A reboot is required after modifying the zabix-agentd.conf, and then you can test your custom key using the software that comes with Zabbix.

zabbix-get -s agent_ip -p 10050 -k mem.usage

Different versions, resulting in pit daddy!
Https://www.zabbix.com/documentation/3.0/manual/config/items/userparameters/extending_agent

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