During this time, not much happened:
staging server dev.decent.im shut down
It wasn't actively used by me for few months, but it costs the same as production host. I decided to stop this waste of funds.
Of course now I need to be more cautious when applying changes to produciton, or at last I should not start testing stuff on production server. I am thinking of making it more possible to replicate entire setup in a locla environment not having all properties of real public server (e.g. public static IP). But this is yet to be resolved in future.
intermittently, unattended upgrade was broken because lua-expat upstream website was down:
lua-expat author has kindly brought up the site on my request. It was brought down manually to stop DoS attack which was mounted against his website.
-> http://code.matthewwild.co.uk/lua-expat/ --> hg identify --id --rev default http://code.matthewwild.co.uk/lua-expat/ --config trusted.users=portage abort: HTTP Error 404: Not Found !!! Error updating dev-lua/luaexpat:0: [Exception] update command returned non-zero result ... * Updating /usr/portage/distfiles/hg-src/luaexpat/lua-expat from http://code.matthewwild.co.uk/lua-expat/ pulling from http://code.matthewwild.co.uk/lua-expat/ abort: HTTP Error 404: Not Found