echo "UserParameter=mdraid,/bin/egrep -c '\[.*_.*\]' /proc/mdstat" > /etc/zabbix/zabbix_agentd.d/userparameter_mdraid.conf
systemctl restart zabbix-agent

<?xml version="1.0" encoding="UTF-8"?>
<zabbix_export>
    <version>3.2</version>
    <date>2016-11-20T12:17:00Z</date>
    <groups>
        <group>
            <name>Templates</name>
        </group>
    </groups>
    <templates>
        <template>
            <template>Template_MDRAID</template>
            <name>Template_MDRAID</name>
            <description/>
            <groups>
                <group>
                    <name>Templates</name>
                </group>
            </groups>
            <applications>
                <application>
                    <name>MD RAID</name>
                </application>
            </applications>
            <items>
                <item>
                    <name>RAID STATUS</name>
                    <type>0</type>
                    <snmp_community/>
                    <multiplier>0</multiplier>
                    <snmp_oid/>
                    <key>mdraid</key>
                    <delay>3600</delay>
                    <history>30</history>
                    <trends>365</trends>
                    <status>0</status>
                    <value_type>3</value_type>
                    <allowed_hosts/>
                    <units/>
                    <delta>0</delta>
                    <snmpv3_contextname/>
                    <snmpv3_securityname/>
                    <snmpv3_securitylevel>0</snmpv3_securitylevel>
                    <snmpv3_authprotocol>0</snmpv3_authprotocol>
                    <snmpv3_authpassphrase/>
                    <snmpv3_privprotocol>0</snmpv3_privprotocol>
                    <snmpv3_privpassphrase/>
                    <formula>1</formula>
                    <delay_flex/>
                    <params/>
                    <ipmi_sensor/>
                    <data_type>0</data_type>
                    <authtype>0</authtype>
                    <username/>
                    <password/>
                    <publickey/>
                    <privatekey/>
                    <port/>
                    <description/>
                    <inventory_link>0</inventory_link>
                    <applications>
                        <application>
                            <name>MD RAID</name>
                        </application>
                    </applications>
                    <valuemap/>
                    <logtimefmt/>
                </item>
            </items>
            <discovery_rules/>
            <httptests/>
            <macros/>
            <templates/>
            <screens/>
        </template>
    </templates>
    <triggers>
        <trigger>
            <expression>{Template_MDRAID:mdraid.last()}&gt;0</expression>
            <recovery_mode>0</recovery_mode>
            <recovery_expression/>
            <name>MD RAID in failure state on {HOST.NAME}</name>
            <correlation_mode>0</correlation_mode>
            <correlation_tag/>
            <url/>
            <status>0</status>
            <priority>5</priority>
            <description/>
            <type>0</type>
            <manual_close>1</manual_close>
            <dependencies/>
            <tags/>
        </trigger>
    </triggers>
</zabbix_export>