Update OpenNMS from 20.0.1 to 21.0.3 on CentOS 7

Hello,

  I'm fairly new to OpenNMS as well as Linux... I installed 20.0.1 around
maybe 8 months ago and I want to update it to the latest version.
Unfortunately I'm not seeing any specific guides for this.  It looks like I
need to update PostgreSQL as well (I'm on 9.2 and would like to go to 10.x)
but again, I'm not entirely sure how this making changes to the database
could impact the installation.
  Is there a walkthrough I'm missing?  If I do a Yum Update opennms, will
that include the dependencies?  Will it migrate the DB to the newer
instance, leaving the data intact?

  Thank you.

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