Steps to reproduce:

1. In Zabbix create SSH check to old device like Cisco with RSA SHA1 only KEX.
2. When you try to get data you have error: 
3. Cannot establish SSH session: kex error : no match for method server host key algo: server [ssh-rsa], client [ssh-dss]

Result:

• Cannot establish SSH session: kex error : no match for method server host key algo: server [ssh-rsa], client [ssh-dss] 
• Looks like libssh in Zabbix ignores ~/.ssh/config and glogal ssh_config files.

Expected:
Getting data via ssh due to add to config file rsa:

cat /home/zabbix/.ssh/config
Host *
KexAlgorithms diffie-hellman-group1-sha1,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1
HostKeyAlgorithms +ssh-rsa,ssh-dss
PubkeyAcceptedKeyTypes +ssh-rsa