Add docs for Oracle ULN content (#3639)

Refs 33250 in Redmine
Refs b781e6af48499137ccf74b57f1b70fbe079673c5 in katello

guides/common/assembly_importing-content.adoc

@@ -71,6 +71,12 @@ include::modules/proc_adding-custom-rpm-repositories-el.adoc[leveloffset=+1]
 :yum_repo_extras_url: https://yum.oracle.com/repo/OracleLinux/OL{os_major}/addons/x86_64/
 include::modules/proc_adding-custom-rpm-repositories-el.adoc[leveloffset=+1]
 
+include::modules/proc_creating-uln-repositories.adoc[leveloffset=+1]
+
+include::modules/ref_uln-repositories-for-oracle-linux-9.adoc[leveloffset=+2]
+
+include::modules/ref_uln-repositories-for-oracle-linux-8.adoc[leveloffset=+2]
+
 :gpg_url: https://dl.rockylinux.org/pub/rocky/RPM-GPG-KEY-rockyofficial
 :os_major: 9
 :os_name: Rocky Linux

guides/common/modules/proc_creating-uln-repositories.adoc

@@ -0,0 +1,19 @@
+[id="creating-uln-repositories"]
+= Creating ULN repositories
+
+You can synchronize content from Oracle Unbreakable Linux Network (ULN) to {Project}.
+There are two main differences compared to generic Yum content:
+
+* The *Upstream URL* field consists of a protocol prefix `uln://` and an `ULN Channel Label`, for example, `ol7_x86_64_MySQL80_community`.
+Combined, `uln://ol7_x86_64_MySQL80_community` is a valid upstream URL for a Yum repository.
+* Authentication against the repository through an *Upstream Username* and *Upstream Password* is mandatory.
+This requires your single sign-on user name and password of your Oracle account to be saved on your {Project}.
+
+To obtain a list of available ULN channel labels, log in to https://linux.oracle.com/[Oracle Unbreakable Linux Network].
+Navigate to the *channels* tab and select an operating system release version and architecture.
+Copy the required *ULN Channel Label* from the list of available content.
+
+Adding ULN repositories is different compared to Yum repositories for {client-os}, for example, `\https://yum.oracle.com/oracle-linux-9.html`, which you can add as Yum-type content.
+For more information, see xref:Adding_Custom_RPM_Repositories_{context}[Adding RPM repositories].
+
+include::snip_limit-download-concurrency-for-uln-content.adoc[]

guides/common/modules/ref_uln-repositories-for-oracle-linux-8.adoc

@@ -0,0 +1,8 @@
+[id="uln-repositories-for-oracle-linux-8"]
+= ULN repositories for Oracle Linux 8
+
+* Addons ULN: `uln://ol8_x86_64_addons`
+* AppStream ULN: `uln://ol8_x86_64_appstream`
+* BaseOS latest ULN: `uln://ol8_x86_64_baseos_latest`
+* Unbreakable Enterprise Kernel Release 6: `uln://ol8_x86_64_UEKR6`
+* kSplice: `uln://ol8_x86_64_ksplice`

guides/common/modules/ref_uln-repositories-for-oracle-linux-9.adoc

@@ -0,0 +1,8 @@
+[id="uln-repositories-for-oracle-linux-9"]
+= ULN repositories for Oracle Linux 9
+
+* Addons ULN: `uln://ol9_x86_64_addons`
+* AppStream ULN: `uln://ol9_x86_64_appstream`
+* BaseOS latest ULN: `uln://ol9_x86_64_baseos_latest`
+* Unbreakable Enterprise Kernel Release 7: `uln://ol9_x86_64_UEKR7`
+* kSplice: `uln://ol9_x86_64_ksplice`

guides/common/modules/snip_limit-download-concurrency-for-uln-content.adoc

@@ -0,0 +1,14 @@
+[IMPORTANT]
+====
+{Team} recommends that you limit the download concurrency to `1` for ULN content to avoid synchronization failures.
+You can use Hammer CLI to configure your ULN repository on {Project}:
+
+[options="nowrap", subs="+quotes,verbatim,attributes"]
+----
+$ hammer repository update \
+--download-concurrency 1 \
+--id _My_ULN_Repository_ID_
+----
+
+Note that this setting is not exposed in the {ProjectWebUI}.
+====