Install rsyslog packages from ubuntu apt repository

[jpalermo]

Currently we install rsyslog packages from a PPA.

It would be more consistent if we could install these from the default Ubuntu apt repository. We tried removing these during Jammy building but not all the rsyslog plugin packages were available.

See which packages are missing, and how important those packages are.

[bgandon]

Some context about this, I remember the rsyslog-mmnormalize module being added in 2021 “for better filtering” through this PR from SAP: #189

Also possibly releavant, this commit from 2018 that re-enabled the rsyslog PPA: 840bb29
Pivotal tracker story gives insights: https://www.pivotaltracker.com/n/projects/956238/stories/159533409

The rsyslog-mmjsonparse package seems to have appeared in March 2025, during the CentOS 7 Stemcell work: cloudfoundry/bosh@1c0852b
(Before that, Rsyslog was built from source with the json-c library for CentOS 6.5.)

Later on in April 2015, the rsyslog-mmjsonparse package has been added to Ubuntu Trusty in this commit: cloudfoundry/bosh@ed561bb

[ramonskie]

we could also move to syslog-ng
see https://www.syslog-ng.com/products/open-source-log-management/syslog-ng-rsyslog-comparison.aspx

[ramonskie]

slack communication https://cloudfoundry.slack.com/archives/C06HTDT78N9/p1710346873390969

[ramonskie]

rsyslog/rsyslog-pkg-ubuntu#168