RTM_LOSING - what does it mean?

[Roy Marples <roy%marples.name@localhost>]

got message of size 160 on Mon Sep  2 02:00:49 2019
RTM_LOSING: Kernel Suspects Partitioning: len 160, pid 0, seq 0, errno 
0, flags: 0x843<UP,GATEWAY,DONE,STATIC>
locks: 0x0 inits: 0x0
sockaddrs: 0x7<DST,GATEWAY,NETMASK>
 46.229.168.163 10.73.0.1 default

So, what does that really mean?
Followup question .... why should I care?

Roy