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Observation -1
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[root@ceph-server ~]# vi /etc/ceph/ceph.conf  <=== set "osd heartbeat interval" to -898

[root@ceph-server ~]# systemctl restart ceph-mon@ceph-server
[root@ceph-server ~]# ceph daemon /var/run/ceph/ceph-mon.*.asok config show > k
[root@ceph-server ~]# vim k
    "osd_heartbeat_interval": "-898",   <=======  Negative value is accepted here which is not feasible
    "osd_heartbeat_grace": "-324",      <=======  Negative value is accepted here which is not feasible
	

	
Remark : There should be an error handling for negative value

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Observation -2
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[root@ceph-server ~]# vi /etc/ceph/ceph.conf  <=== set "osd heartbeat interval" to 1BG3
[root@ceph-server ~]# systemctl restart ceph-mon@ceph-server
[root@ceph-server ~]# ceph daemon /var/run/ceph/ceph-mon.*.asok config show > k
[root@ceph-server ~]# vim k
    "osd_heartbeat_interval": "6",   <=======  The behavior is as per expectation
    "osd_heartbeat_grace": "20",