We are upgrading all servers components, we have noticed the following message when applying the Hotfix 84 in the EM
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Checking if PostgreSQL has been installed with EM.
Searching for PostgreSQL installation at /opt/apm/PostgreSQL-9.6.2
PostgreSQL not found - don't forget to execute this patch for PostgreSQL too!
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Hotfix 10.7.0-HF84 was applied successfully
You can ignore the message
When going to 10.8, there is a completely different version of Postgres that you would need to install
You will need to export the old database and import it.