Comment 26 for bug 1701068

Just my 2 cents:
In general, publishing important security/maintenance related notices by means of https://motd.ubuntu.com sounds like a good idea (especially if you don't use canonical-livepatch in case of critical security hazards), but I'd strongly suggest to allow for client side configuration/filtering by means of tags, e.g.,

 * [16.10][maintenance] Ubuntu 16.10 will reach end of life on […] July 20, 2017
 * [16.04][security][<4.4.0-83] Please consider updating your kernel ASAP

(The second example would require version based comparisons, but you get the idea.)
There's no need to disclose any client specific information, and it won't hurt to transfer a few bytes more.