In several places of /src/zabbix_server/poller/checks_simple_vmware.c and /src/zabbix_server/vmware/vmware.c we pass uninitialized counterid to zbx_vmware_service_get_counterid() (src/zabbix_server/vmware/vmware.c) where we can accidentally log it uninitialized if we fail to find respective counter and initialize counterid properly.

I would suggest logging different messages (with or without counterid value) depending on ret.