Currently we have these:
Reverse-Recommends
==================
* ceph-base                     (for chrony)

This is the same case as with Freeipa.

* radioclk                      (for chrony)

This is meant to provide DCF77 input to chrony, so ok

Reverse-Depends
===============
* freeipa-client                (for chrony)
* freeipa-server                (for chrony)

This is how this bug was reported.
I think it is a common and working resolution to depend on the current 
timeserver.
I'd vote for the Depends becoming recommends so that admins can remove the 
package if wanted.

* gce-compute-image-packages    (for chrony)

That is an intentional "there you should sync with that" AFAIK. keeping
as-is IMHO

* maas-rack-controller          (for chrony)
* maas-region-api               (for chrony)

I know for MAAS that they really want this, even on a Container, so considering 
them ok'ish.
They even modify chrony.conf and such, so there a depends is correct.


In general I think the Ceph approach is good, keeping it as a recommends allows 
to remove it if needed. BTW Chrony on Containers will by default only serve the 
local time as syncing it would not work (CAP_SYS_TIME) anyway - so not much 
lost.

systemd-timesyncd is "only" SNTP which has to be considered inferior to
full ntp syncing.

For Ceph and Freeipa once being a recommends, I'd wish there would be a
dependency that says "but not in containers", but there is none.

** Also affects: ceph (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ceph (Ubuntu)
       Status: New => Invalid

** Also affects: maas (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: maas (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1778911

Title:
  freeipa-client hard depends on chrony

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