Looking for any Google or gmail related issues with WHD upgrade to 12.7.9?

What do you mean by "Google" using Authentication or LDAP Sync?

If you use G-Mail then there should be no difference but Google have switched off IMAP for less secure applications so you might be forced to go to their Modern OAUTH Mailbox connector.

I think you may be seeing what I am seeing with the "no email notifs" on new ticket creation. 

We are about a week out from the upgrade but want to make sure no gotchas.

I thought I had read something about gmail issues but can't find it now, so

was asking the experts!

If you are using G-Mail as your E-Mail provider then they have/are stopping connections via IMAP and will be forced to use Modern Auth OAUTH instead. https://support.google.com/accounts/answer/6010255?hl=en

The requirements for this have not changed between WHD12.7.7 and WHD12.7.9 so if it currently works a WHD upgrade should not be stopped because of this.

documentation.solarwinds.com/.../helpdeskconfigureincomingemailaccountforgmail.htm

You might want to hold off from this, we have been made aware of an issue if using the same Google Mail/G-Suite Mail account which was previously used with the less secure IMAP method - basically Inbound doesn't work.

I believe the issue is when changing the Mailbox from IMAP Less Secure to Modern Auth it does not work well, a new mailbox using Modern Auth from day one should work with WHD from what I hear. I suspect SW thus tested using a brand new Mailbox only originally.

G-Suite now requires Oauth2 authentication.  You can get around this by craeating an application password to connect but it requires configuring 2-factor authentication.  This is done through the security settings of the account in question.