Official guide I do not remember.This is for performance troubleshooting:

Official guide I do not remember.This is for performance troubleshooting:
http://www.vmware.com/resources/techresources/10066This is the official course: VMware vSphere: Troubleshooting V4 - http://mylearn.vmware.com/mgrreg/courses.cfm?ui=www_edu&a=one&id_subject=17829

ESX Troubleshooting

Have a look at:Vmware ESX Troubleshooting Guidehttp://www.petri.co.il/5-critical-vmware-esx-cli-network-commands.htm
And for documentshttp://download3.vmware.com/vmworld/2006/mdc9694.pdfhttp://download3.vmware.com/vmworld/2006/mdc9807.pdfhttp://download3.vmware.com/vmworld/2006/tac0028.pdfhttp://download3.vmware.com/vmworld/2006/tac9689-b.pdf
xtravirt published a HA troubleshooting whitepaperhttp://xtravirt.com/xd10005#
There is also a new VMware 3 days course specific for troubleshooting.

vSphere 4:Review Guide