Please refer https://bugzilla.redhat.com/show_bug.cgi?id=1262976#c13 . which will explain why this bug.
According to https://bugzilla.redhat.com/show_bug.cgi?id=1262976#c6 , upstart shows inconsistent behaviour. Hence this needs to be documented in "know issues" section of release notes for 1.3.0 Ubuntu.
The behavior is not inconsistent, just too eager / generous. Release notes: "The upstart respawn limit has been changed from 5 restarts in 30 seconds to 3 restarts in 30 minutes for the OSD and MON daemons".
Actually, this is not a "known issue", it is a change. Carrying this to the release notes directly.
@Federico, While verifying https://bugzilla.redhat.com/show_bug.cgi?id=1262976 we found this issue which still exists. So I think this bug still should go as "known issue" since behaviour is inconsistent. Please refer https://bugzilla.redhat.com/show_bug.cgi?id=1262976#c13 . Here it says the actual fix for 1262976 should go as release notes, whereas this bug should goto "known issues" so that it gives clarity to the user about the changes and its side effects. Reopening this bug ,Let me know your thoughts.
Maybe there is an inconsistency in Upstart's behavior, on the point where it reaches saturation (don't know — may be designed to be this way), but it doesn't matter, we don't make Ubuntu here :) The item we need to document is the changes in our Upstart settings (the other bug). This one is not a Ceph issue, and I don't think we should care to report it against Ubuntu itself they are switching to Systemd as well in 16.04.