Azure AD Pass-through Authentication: Upgrade Authentication Agents

Hello,

I got an email askginus to upgrade Azure AD Pass-through Authentication: Upgrade Authentication Agents.  

So I followed this articel and did it:

https://docs.microsoft.com/en-gb/azure/active-directory/connect/active-directory-aadconnect-pass-through-authentication-upgrade-preview-authentication-agents

So I had to install the agent onto anther server so we have High Availability, now it's completed it says inactive next to 1 of the 2 servers running the agent.  In the documentation it says this normal and it will drop of in a few days.  

So does this mean we don't have HA?

Example:

server-azure1  inactive (has the agent installed and AD connect)

server-azure2 active (just has the agent installed, no AD connect)

Please can you explain the HA or the above.

Thanks