[ClusterLabs] FYI: one more regression introduced in Pacemaker 2.1.3

[Ken Gaillot]

Quick update: I believe only the redis and rabbitmq agents were
affected, so most users don't have to care about this issue.

On Mon, 2022-06-27 at 16:07 -0500, Ken Gaillot wrote:
> Hi all,
> 
> Another regression was found that was introduced in Pacemaker 2.1.3.
> 
> As part of trying to make the output of various commands more
> consistent, as of 2.1.3, "crm_attribute --quiet --query" prints
> "(null)" for an attribute that does not exist. Previously, it would
> not
> print anything.
> 
> Unfortunately, certain resource agents, at least including redis,
> depended on the previous behavior. The agents most likely to be
> affected are those for promotable resources.
> 
> The original behavior is restored as of commit 9853f4d05 in the main
> branch. Users who use promotable resources are advised to wait until
> the fix is released (expected in 2.1.5 at the end of this year) or
> ensure that their OS packages include the fix if using 2.1.3 or
> 2.1.4.
-- 
Ken Gaillot <kgaillot at redhat.com>