You have to enable it with the CLI since it isn't setup by default:
http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.monitoring.doc_50%2FGUID-8EF36D7D-59B6-4C74-B1AA-4A9D18AB6250.html

Chip

From: Paul Gear <observium@gear.dyndns.org>
To: observium@observium.org
Sent: Thursday, May 16, 2013 4:44 PM
Subject: Re: [Observium] esx 5 server memory not showing

On 05/17/2013 09:40 AM, Tom Laermans wrote:
Interesting how we run HP memory pool discovery on a vmware box?

Either way, ESX(i) doesn't do very much SNMP...

So how does one monitor it with Observium?  My ESXi boxes don't respond to SNMP at all, and i could never find any option to enable it...

Paul

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