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ROX-20769: Add changelog entry about major version upgrade #93434

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ROX-20769: Add changelog entry about major version upgrade #93434

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30 changes: 29 additions & 1 deletion release_notes/48-release-notes.adoc
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Expand Up @@ -42,7 +42,35 @@ Policy::

This release adds improvements related to the following components and concepts:


//ROX-20769
[id="central-db-postgresql_15_{context}"]
=== Central DB uses PostgreSQL 15

The Central DB component now uses PostgreSQL 15, and {product-title-short} 4.8
supports this version for external databases. A new installation with an
internal database now uses this version by default. When upgrading an existing
cluster to {product-title-short} 4.8, Central DB will perform an upgrade of the
data it has collected.

[IMPORTANT]
====
When preparing the upgrade to {product-title-short} 4.8, follow these
suggestions:

* Back up the database before upgrading to {product-title-short} 4.8
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* Back up the database before upgrading to {product-title-short} 4.8
* Back up the database before upgrading to {product-title-short} 4.8.


* If you are not upgrading by using the Operator, check the disk space
available for the database by viewing the
`rox_central_postgres_available_size_bytes` metric. For the purposes of the
upgrade, the value should be double the amount of the already-consumed disk
space, as shown in the `rox_central_postgres_total_size_bytes` metric. If the
value is not correct, extend the database PVC.

* Do not interrupt the upgrade procedure. If the upgrade is interrupted, a
manual intervention might be required to proceed.

Depending on the amount of data, the upgrade can take extra time to finish.
====

[id="notable-technical-changes-rn-48_{context}"]
== Notable technical changes
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